K

™

  

FASTENERS FOR

USE WITH PC BOARDS

PEM® brand fasteners that utilize, 
surface-mount, broaching and flaring 
technology for use with PC boards.

Fasteners For Use With PC Boards

K-2

    

PennEngineering • 

www.pemnet.com

No matter how sophisticated or advanced, electronic components must be attached reliably and securely if they are to deliver 

optimum performance. We offer several fastener products for use with PC boards to satisfy component-to-board, board-to-board, 

and board-to-chassis attachment needs.

ReelFast® surface mount fasteners

 mount on PC boards in the same manner and at the same time as other surface mount 

components prior to the automated reflow solder process. The fasteners simply become another board component. This alleviates 

concerns about potential damage to PC boards due to improper secondary installation operations. The fasteners are provided on 

tape and reel compatible with existing SMT automated installation equipment. The benefits of using ReelFast® SMT fasteners are: 

faster assembly; reduced scrap; reduced handling; and reduced risk of board damage.

Broaching fasteners

 can also offer practical alternatives to “loose” hardware. A broaching fastener is a knurled-shank fastening 

device that can be pressed into a hole to provide a permanent, strong, threaded or unthreaded attachment point in PC boards. 

They can also be used in aluminum, acrylic, casting and polycarbonate components. Specially formed axial grooves around the 

shank of the fastener “broach” or cut into the material, creating a firm, interference-type fit resistant to rotation. In PC boards, 

broaching fasteners are recommended for use in non-plated holes.

Broach/flare-mount standoffs

 (KFB3™) offer a combined broach/flare feature for even greater pullout performance in  

PC board materials.

Fastener drawings and models are available at 

www.pemnet.com.

Custom sizes are available on special order. 

Contact us

 for more information.

Nuts And Spacers/Standoffs

SMTBSO™ -

 ReelFast® surface mount fasteners 

with internal blind-hole threads - 

PAGE 4

SMTSO™/SMTSOB™

 — ReelFast® surface mount 

nuts and standoffs are available threaded and 

unthreaded — 

PAGE 5

SMTSS™

 — ReelFast® SNAP-TOP® standoffs 

feature a spring action to hold PC board securely 

without screws or threaded hardware — 

PAGE 6

SMTSK™

 — ReelFast® KEYHOLE® standoffs 

eliminate the need for attaching screws — 

PAGE 7

KF2™/KFS2™

 — Broaching nuts, internally 

threaded for mounting on PC boards — 

PAGE 8

KFE™/KFSE™

 — Broaching standoffs, threaded or 

unthreaded for stacking or spacing — 

PAGE 9

KFB3™

 — Broach/flare-mount standoffs with 

greater pullout performance — 

PAGE 10

KSSB™

 — Broaching, SNAP-TOP® standoffs 

feature a spring action to hold PC board securely 

without screws or threaded hardware — 

PAGE 11

Captive Panel Screws

SMTPFLSM™

 — ReelFast® surface mount spring-

loaded captive panel screws — 

PAGE 12

SMTPF™

 — ReelFast® surface mount captive 

panel screws — 

PAGE 13

PFK™

 - Broaching panel fastener assemblies for 

mounting on PC boards — 

PAGE 14

Studs

KFH™

 — Threaded broaching studs for use 

as solderable connectors or as permanently 

mounted studs on PC boards — 

PAGE 15

Right Angle Fasteners

SMTRA™

 — ReelFast® R’ANGLE® surface mount 

fasteners provide strong re-usable threads at 

right angles to PC boards — 

PAGE 16

Sheet Joining Fasteners

SFK™

 — SpotFast® clinch/broach mount 

fasteners for joining metal to PCB/plastic panels  

— 

PAGE 17

Material and Finish Specifications  

— 

PAGE 18

Installation

— 

PAGE 19-22

Performance Data

— 

PAGE 23-25

Other fasteners for use with PC boards

— 

PAGE 26

© 2023 PennEngineering.

New

Fasteners For Use With PC Boards

K-3

   

PennEngineering • 

www.pemnet.com

  SMTBSO 

4    

•    • •

 SMTSO/SMTSOB 

5     

•    • •

 SMTSS 

6 

  •   •  •

 

SMTSK 

7    

•     •

 KF2/KFS2 

8 

•      •

 KFE/KFSE 

9 

•      •

 

KFB3 

10  

•       •

 KSSB 

11 

•      •  •

  SMTPFLSM 

12    

•      

   •

 

SMTPF 

13    

•      

   • •

 PFK 

14 

•           •

 KFH 

15 

•          •

 

SMTRA 

16    

•           •

 SFK 

17 

   •            •

Quick Reference Chart

To be sure that you are getting genuine PEM® brand fasteners, look for the unique PEM® product markings and identifiers.

PEM® Trademarks

PEM® Double Notch

(Registered Trademark)

PEM® “Two Groove”

(Registered

Trademark)

 

 PEM® 

Page

 Fastener 

No.

Fastener drawings 

and models are 

available at

www.pemnet.com

 

             Right 

Sheet 

to

    Broach/ Surface  Clinch/    Spacer/ 

Snap 

  Captive  Color 

Angle 

Sheet

 Broach  Flare 

Mount 

Broach 

Nut  Standoff  Attachment  Stud 

Screw  Coding  Attachment  Joining

PEM® Dimple

(Registered Trademark)

PEM® Blue  

Nylon Ring

(Trademark)

Mounting Types

Primary Use

PEM® 3 Dimple

(Registered Trademark)

Custom sizes are available on special order. 

Contact 

us

 for more information.

Fasteners For Use With PC Boards

K-4

    

PennEngineering • 

www.pemnet.com

New

SMTBSO™ ReelFast® Surface Mount Fasteners

•  Internal blind-hole threads securely mounts onto PC Board - less risk of damage to PC 

Board during assembly

•  Allows for copper traces to run under the fastener which better utilizes space on the 

board

•  Enhanced PC Board performance due to cut out of the fastener that allows for localized 

heat up of the area in contact with the solder

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Thread

Size

Type

Thread

Code

Length Code “L” ±.005

(Length code in 32nds of an inch)

E

±.005

Ø

D

Min. Solder Pad

F

Min.

.187

.112-40

(#4-40)

SMTBSO

440

6

.219

.244

.125

Me

tric

Thread

Size

Type

Thread

Code

Length Code “L” ±0.13

(Length code in millimeters)

E

±0.13

Ø

D

Min. Solder Pad

F

Min.

M3 x 0.5

SMTBSO

M3

4

5.56

6.2

2.4

All dimensions are in inches.

All dimensions are in millimeters.

ØD

Solder

Pad

Patent 

pending

Part

Number

Number of Parts per Reel

SMTBSO-440-6ET

650

SMTBSO-M3-4ET

1000

Number of Parts per Reel

E

L

PEM® “Two Groove” 

(Registered Trademark)

F

The SMTBSO™ fastener does not require 

a through hole allowing for copper traces 

to run under the fastener which better 

utilizes space on the board.

PC Board with 

through hole.

PC Board without 

through hole.

SMTBSO  – 440  –  6 

ET

Part Number Designation

Type and

Material

Finish

Thread 

Code

Length

Code

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Fasteners For Use With PC Boards

K-5

   

PennEngineering • 

www.pemnet.com

SMTSO™/SMTSOB™ Reelfast® Surface Mount Nuts And Spacers/Standoffs

Packaged on 330 mm recyclable reels. Tape width is 24 mm. Reels conform to EIA-481.

 

 

Thru                         Type   

Thread or 

 

 

 

 

Min. 

 

 

            E   

 

ØH  Hole Size 

ØD

  Thread 

Hole                    Fastener Material 

Thru Hole 

 

 

 

 

Sheet 

A 

C 

 

 

H 

In Sheet 

Min. Solder

  Size 

+.004 –.003 

Steel Brass Code .062 .125 .250 .375 

Thickness 

Max. 

Max. 

Ref.  ±.005 

Nom. 

+.003 –.000 

Pad

  .060-80 

— 

SMTSO  — 

080 

2  4  —  —  .020  .019  .095  .144   .125 

.098 

.165

 (#0-80)

  .086-56 

— 

SMTSO SMTSOB  256  2  4  8 

(1)

 12 

(1)

 .060  .060 .142 — 

.219 — 

.147 

.244

 (#2-56)

  .112-40 

— 

SMTSO SMTSOB  440  2  4  8 

(1)

 12 

(1)

  .060  .060  .161  — .219  — 

.166 

.244

 (#4-40)

  .138-32 

— 

SMTSO SMTSOB  632  2  4  8 

(1)

 12 

(1)

  .060  .060  .208  — .281  — 

.213 

.306

 (#6-32)

  .164-32 

— 

SMTSO SMTSOB  832  2  4  8 

(1)

 12 

(1)

  .060  .060  .245  — .344  — 

.250 

.369

 (#8-32)

 — 

.116 

SMTSO  SMTSOB  116 

2 

4 

8  12  .060  .060  .161  — .219  — 

.166 

.244

 — 

.143 

SMTSO  SMTSOB  143 

2 

4 

8  12  .060  .060  .208  — .281  — 

.213 

.306

Length Code “L” ±.005

(Length code in 32nds of an inch)

  Thread 

Thru Hole                    Type   

Thread or 

 

 

 

 

 

 

 

Min. 

 

 

             E   

 

ØH  Hole Size 

ØD

 

Size x 

+0.10             Fastener Material 

Thru 

Hole 

       Sheet A C   H  In 

Sheet Min. 

Solder

 Pitch  –0.08  Steel Brass Code        

Thickness 

Max. 

Max. 

Ref. 

±0.13 

Nom. +0.08  Pad

  S1 

—  SMTSO  — 

M1  1 2  3 — — — —  0.5  0.48 2.41 3.66 — 3.18 

2.5 

4.19

 S1.2 

—  SMTSO  —  M1.2  1 2  3 — — — —  0.5  0.48 2.41 3.66 — 3.18 

2.5 

4.19

 S1.4 

—  SMTSO  —  M1.4  1 2  3 — — — —  0.5  0.48 2.41 3.66 — 3.18 

2.5 

4.19

  M1.6 x 0.35 

— 

SMTSO 

— 

M1.6 

1 

2 

3 

— 

— 

— 

— 

0.5 

0.48 

2.41 

3.66 

— 

3.18 

2.5 

4.19

  M2 x 0.4 

— 

SMTSO  SMTSOB 

M2 

— 

2 

3 

4 

(1)

 6 

(1)

 8 

(1)

 10 

(1)

  1.53  1.53  3.6  — 5.56 — 

3.73 

6.2

  M2.5 x 0.45 

— 

SMTSO  SMTSOB 

M25 

— 

2 

3 

4 

(1)

 6 

(1)

 8 

(1)

 10 

(1)

  1.53  1.53  4.09  — 5.56 — 

4.22 

6.2

  M3 x 0.5 

— 

SMTSO  SMTSOB 

M3 

— 

2 

3 

4 

(1)

 6 

(1)

 8 

(1)

 10 

(1)

  1.53  1.53  4.09  — 5.56 — 

4.22 

6.2

  M3.5 x 0.6 

— 

SMTSO  SMTSOB 

M35 

— 

2 

3 

4 

(1)

 6 

(1)

 8 

(1)

 10 

(1)

  1.53  1.53  5.28 — 7.14 — 

5.41 

7.77

  M4 x 0.7 

— 

SMTSO  SMTSOB 

M4 

— 

2 

3 

4 

6 

(1)

 8 

(1)

 10 

(1)

  1.53  1.53  6.22  — 8.74 — 

6.35 

9.37

  — 

3.1  SMTSO SMTSOB  3.1  —  2  3  4  6  8  10  1.53  1.53  4.09  — 5.56 — 

4.22 

6.2

  — 

3.6  SMTSO SMTSOB  3.6  — 2  3  4  6  8 10  1.53  1.53  5.28 — 7.14 — 

5.41 

7.77

  — 

4.2  SMTSO SMTSOB  4.2  —  2  3  4  6  8  10  1.53  1.53  6.22  — 8.74 — 

6.35 

9.37

Length Code “L” ±0.13

(Length code in millimeters)

 

Thread/Thru-Hole 

 

 

 

Length Code

 

Size 

1 2  3  4 6 8 10  12

 

080 

— 

3500 / 8 

— 

2000 / 8 

— 

— 

— 

—

 

256, 440, 632, 116, 143 

— 

1500 / 12 

— 

1000 / 12 

— 

650 / 12 

— 

300 / 16

 

832 

— 

1100 / 16 

— 

800 / 16 

— 

500 / 16 

— 

300 / 16

 

M1, M1.2, M1.4, M1.6 

3500 / 8 

2500 / 8 

2000 / 8 

— 

— 

— 

— 

— 

 

M2, M25, M3, M35, 3.1, 3.6 

— 

1500 / 12 

1000 / 12 

900 / 12 

650 / 12 

375 / 16 

300 / 16 

—

 

M4, 4.2 

— 

1100 / 16 

800 / 16 

675 / 16 

500 / 16 

375 / 16 

300 / 16 

—

ØH

ØD

Solder

Pad

Mounting hole 

does not need to 

be plated through.

Number Of Parts Per Reel / Pitch (MM) For Each Size

SMTSO  – 440  –  8 

ET

SMTSOB  – 440  –  8 

ET

Type and

Material

Part Number Designation

Finish

Thread or 

Thru Hole

Code

Length

Code

All dimensions are in inches.

All dimensions are in millimeters.

E

H

C

A

L

PEM® Double Notch

(Registered Trademark)

Metric -1 length not marked

Thread sizes 080, S1, S1.2, S1.4 and M1.6

Thread/thru hole sizes 2-56, 4-40, 6-32, 8-32, 116, 143, M2, M2.5, M3, M3.5, M4, 3.1, 3.6, and 4.2

(1)  SMTSOB fasteners with this length code have a shank counterbore.

E

A

C

L

PEM® SMTSO and SMTSOB standoffs may 

be marked with either our “Two Groove” or 

“3 Dimple” registered trademarks.

E

A

C

L

MicroPEM® SMTSO Nuts

A polyimide patch is supplied to 

allow for reliable vacuum pickup. 

Fasteners are also available without 

a patch which may provide a lower 

cost alternative, depending on your 

installation methods/requirements.

Stencil Masking Examples

NOTE:

 Standoffs are available on special order without a pilot that do not require a 

thru hole for installation. Contact 

techsupport@pemnet.com

 for more information.

SMTSOB(1)

SMTSO/SMTSOB

SMTSO™ fasteners available

in copper upon request.

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Fasteners For Use With PC Boards

K-6

    

PennEngineering • 

www.pemnet.com

SMTSS™ Reelfast® Snap-Top® Standoffs

ØH

ØD

Solder

Pad

Mounting hole 

does not need to 

be plated through.

Number Of Parts Per Reel

Packaged on 330 mm recyclable reels. Tape width is 24 mm.

Supplied with polyimide patch for vacuum pick up. Reels conform to EIA-481.

 

Top 

Board 

   

  Min.      

ØH 

Hole 

ØD

  Mounting Hole A 

Type and 

 

 

Sheet 

A 

C 

E 

B 

P 

Size in Sheet 

Min.

  Diameter Code 

Material 

.250 .375 

Thickness 

Max. 

Max. 

±.005 

±.005 

±.005 

+.003 –.000 

Solder Pad

 156  SMTSSS  8 

12 

.060  .060  .161  .250  .188  .141 

.166 

.276

 

Length Code “L” ±.005

(Length Code in 32nds of an inch)

All dimensions are in inches.

 

Top 

Board 

 

  

 Min.      

ØH 

Hole 

ØD

  Mounting Hole A 

Type and 

 

 

 

Sheet 

A 

C 

E 

B 

P 

Size in Sheet 

Min.

  Diameter Code 

Material 

 

    Thickness Max.  Max. ±0.13 ±0.13 ±0.13  +0.08 Solder 

Pad

 4MM  SMTSSS 6 

8  10 

1.53 

1.53  4.09  6.35  4.8  3.58 

4.22 

7

 

Length Code “L” ±0.13

(Length Code in millimeters)

All dimensions are in millimeters.

 

Type, Material and Size               Length Code / Number of Parts per Reel

 

SMTSSS-156 

 -8 / 280 

 

-12 / 220

 

SMTSSS-4MM 

-6 / 300  

-8 / 250 

 -10 / 200

Stencil Masking Examples

NOTE: 

REELFAST® SNAP-TOP® 

SMTSS™ standoffs are for on-only 

applications. For removal applications, 

mounting hole A can be increased to 

reduce removal force.

SMTSS™ Application Data

  

 

Bottom 

 

 

   Top   

  Edge

  

Hardness  Mounting  Panel  Thickness 

Location  Hardness Mounting 

Panel 

Thickness 

Distance

 

Type 

Max. 

Hole B 

Material 

Min. 

Tolerance 

Max. 

Hole A 

Material 

Range 

C Min.

 

 

 

+.003 -.000 

 

 

 

 

+.003 -.000 

 

 

SMTSS 

No Limit 

.166 

PC board 

.060 

±.005 

No Limit 

.156 

PC board or Metal 

.040 - .070 

.100

Panel 1

Panel 2

All dimensions are in inches.

Mounting Hole A

Mounting Hole B

Location Tolerance

Edge

C

PANEL 2 (TOP)

PANEL 1 (BOTTOM)

  

 

Bottom 

 

 

   Top   

 Edge

  

Hardness  Mounting  Panel  Thickness 

Location  Hardness Mounting 

Panel 

Thickness 

Distance

 

Type 

Max. 

Hole B 

Material 

Min. 

Tolerance 

Max. 

Hole A 

Material 

Range 

C Min.

 

  +0.08       

+0.08  

 

SMTSS 

No Limit 

4.22 

PC board 

1.53 

±0.13 

No Limit 

4 

PC board or Metal 

1 - 1.8 

2.54

Panel 1

Panel 2

All dimensions are in millimeters.

SMTSS S  –  156  –  12  ET

Top Board 

Mounting Hole  

A Diameter Code

Length

Code

Finish

Type Material

E

P

L

A

C

B

PEM® “dimple” registered trademark.

Part Number Designation

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Fasteners For Use With PC Boards

K-7

   

PennEngineering • 

www.pemnet.com

SMTSK™ Reelfast® Keyhole® Standoffs

SMTSK - 6 

060  -  12  ET

Body

Size Code

Sheet

Thickness

Length

Code

Type

Finish

 

   

                    ØH ØD

  Type 

Body Size - 

 

 

 

Min. 

A 

C 

E 

B 

P 

R 

S 

M 

Hole Size 

Min.

 

 

Sheet Code 

.125 .250 .375

  Sheet  Max.  Max. ±.005 ±.003 ±.003 Max. ±.003 Max.  in 

Sheet Solder

 

   

     Thickness 

           

+.003 

-.000 

Pad

 

SMTSK  6060 

4 

8 

12 

.060  .060  .161 .250  .177  .099 .212 .068 .108  .166  .276

All dimensions are in inches.

Length “L” ± .005

  (Length Code in 32nds of an inch)

 

     

 

 

 

               ØH ØD

  Type 

Body Size - 

 

 

 

 

 

Min. 

A 

C 

E 

B 

P 

R 

S 

M 

Hole Size 

Min.

   Sheet 

Code            Sheet  Max.  Max. ±0.13 ±.0.08 ±0.08 Max. ±0.08 Max.  in 

Sheet Solder

 

     

 

 

 

 

Thickness 

           +0.08 

Pad

 

SMTSK  61.5  3  4  6  8 10  1.53  1.53  4.09 6.35  4.5  2.51  5.39  1.73  2.75  4.22 

7

All dimensions are in millimeters.

Length “L” ± 0.13

 

(Length Code in millimeters)

ØH

ØD

Solder

Pad

Mounting hole 

does not need to 

be plated through.

Number Of Parts Per Reel

Packaged on 13" recyclable reels. Tape width is 24mm and 16mm.

Pitch is 16mm and 12mm. Reels conform to EIA-481.

 

Part Number

            

 

Length Code "L"

  

.125  .250 .375

 

SMTSK-6060

 4 

8 

12

  

630 440 230

 

Part Number              

  Length Code "L"

 

SMTSK-61.5

  3  4  6  8 10

   640 540 440 260 220

B

P

C

R

L

A

M

S

E

PEM® “dimple” registered trademark.

Stencil Masking Examples

Application Data

  

 

Bottom 

 

 

 

        

  Edge

  

Hardness  Mounting  Panel  Thickness 

Location          Panel Thickness 

Distance

 

Type 

Max. 

Hole B 

Material 

Min. 

Tolerance 

A

1

 A

2

 A

3

 A

4

 Material  Range  C

2

 Min.

 

  

+.003 

-.000 

    

Nom.  ±.003 ±.003  Min.  

 

SMTSK 

No Limit 

.166 

PC board 

.060 

±.005 

.059 

.118 

.197 

.148 

ANY 

.057 - .064 

.160

Panel 1

Panel 2

All dimensions are in inches.

  

 

Bottom 

 

 

 

      

  Edge

  

Hardness  Mounting  Panel  Thickness 

Location     Panel 

Thickness 

Distance

 

Type 

Max. 

Hole B 

Material 

Min. 

Tolerance 

A

1

 A

2

 A

3

 A

4

 Material  Range  C

2

 Min.

 

  +0.08     

Nom. ±0.08 ±0.08  Min. 

 

SMTSK 

No Limit 

4.22 

PC board 

1.53 

±0.13 

1.5 

3 

5 

3.75 

ANY 

1.45 - 1.62 

4.1

Panel 1

Panel 2

All dimensions are in millimeters.

Top Mounting Hole A

Top Mounting Hole A

Mounting Hole A in Panel 2

A

3

 Dia.

A

1

 Rad.

A

2

A

4

Location

Tolerance

±.005 "/±0.13mm

Location Tolerance

±.005" / ±0.13mm

PANEL 2 (TOP)

PANEL 1 (BOTTOM)

Mounting Hole A

Edge

C

2

Mounting Hole B

•  Unique barrel design allows for 

quick attachment and detachment.

•  Makes horizontal or vertical 

component mounting possible.

Part Number Designation

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-8

    

PennEngineering • 

www.pemnet.com

  

Type 

 

A 

Min. 

Hole Size 

 

 

 

Min. Dist.

 Thread 

 

 

Thread  (Shank) 

Sheet 

In Sheet 

C 

E 

T 

Hole C/L

 Size 

Carbon  Stainless  Code  Max. 

Thickness 

+.003 –.000 

±.003 

±.005 

±.005 

to Edge

 

 Steel 

Steel 

         

(1)

 

.086-56 

KF2  KFS2 256 .060  .060  .147  .165  .219  .065  0.16

 

(#2-56)

 

.112-40 

KF2  KFS2 440 .060  .060  .166  .184  .219  .065  0.17

 

(#4-40)

 

.138-32 

KF2  KFS2 632 .060  .060  .213  .231  .281  .065 0.22

 

(#6-32)

 

.164-32 

KF2  KFS2 832 .060  .060  .250  .268  .344  .096 0.25

 

(#8-32)

 

.190-32 

KF2  KFS2 032 .060  .060  .272  .290  .375  .127  0.28

 

(#10-32)

All dimensions are in inches.

All dimensions are in millimeters.

       Thread  Type  

A 

Min. 

Hole Size 

 

 

 

Min. Dist.

 

Size x 

 

 Thread 

(Shank) 

Sheet 

In Sheet 

C 

E 

T 

Hole C/L

 

Pitch 

Carbon  Stainless Code  Max. 

Thickness 

+0.08 

±0.08 

±0.13 

±0.13 

to Edge

 

 Steel 

Steel 

         

(1)

 M2 

x 0.4 

KF2 

KFS2 

M2 

1.53 

1.53 

3.73 

4.19 

5.56 

1.5 

4.2

 M2.5 

x 0.45 

KF2 

KFS2 

M2.5 

1.53 

1.53 

4.22 

4.68 

5.56 

1.5 

4.4

 M3 

x 0.5 

KF2 

KFS2 

M3 

1.53 

1.53 

4.22 

4.68 

5.56 

1.5 

4.4

 M4 

x 0.7 

KF2 

KFS2 

M4 

1.53 

1.53 

6.4 

6.81 

8.74 

2 

6.4

 M5 

x 0.8 

KF2 

KFS2 

M5 

1.53 

1.53 

6.9 

7.37 

9.53 

3 

7.1

KF2™/KFS2™ Broaching Nuts

KF2 – 832 – ET

Type and

Material

Finish

Thread

Code

KFS2 –  832

E

C

A

T

Note About Plated And Unplated Mounting Holes For Broaching Fasteners

Broaching and broach/flare types are designed for unplated mounting hole applications. If used in plated mounting holes, the stresses 

involved can damage the plating, push out the plating entirely, or break any traces inside the board that might be connected to the plated 

hole. When installing into non-plated mounting holes there may even be issues with delamination, measeling or crazing in some instances. 

Increasing the mounting hole size +.005” to +.008” /+0.13 mm to +0.2 mm may relieve these conditions. If increasing the mounting hole 

does not correct the issue then we recommend our surface-mount type fasteners.

It is always recommended that you try the fasteners in your specific application before full production begins.  We are happy to provide 

samples for this purpose.

General recommendations for “Keep Out” areas are the same as our “Min. Distance Hole C/L to Edge” dimensions stated in the dimensional 

charts of our bulletin.

•  Can be used in aluminum, acrylic, casting and polycarbonate components

(1) For more information on proximity to bends and distance to other clinch hardware, see 

PEM® Tech Sheet C/L To Edge

.

“PEM” Stamp

(Registered Trademark)

Part Number Designation

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-9

   

PennEngineering • 

www.pemnet.com

KFE™/KFSE™ Broaching Standoffs

All dimensions are in inches.

All dimensions are in millimeters.

KFE – 632  – 12   ET

Type and

Material

Finish

Thread

or Thru 

Hole Code

Length

Code

KFSE –  632  –  12

E

A

L

F

A

L

C

C

PEM® “Two Groove”  

(Registered Trademark)

(1)  Blind at shank end with .375” minimum thread length from head end.

(2)  For more information on proximity to bends and distance to other clinch hardware, see 

PEM® Tech Sheet C/L To Edge

.

Part Number Designation

   Thru 

Type 

Thread 

Length “L” ±0.13

 

A 

Min. 

Hole Size 

 

 

Min. Dist

  Thread 

Hole 

 

 

or Thru 

(Length Code is in millimeters)

 

(Shank)  Sheet 

In Sheet 

C 

E 

Hole C/L

  Size x 

+0.10 

Carbon Stainless 

Hole          

Max. 

Thick- 

+0.08 

±0.08 

±0.13 

to 

Edge

 Pitch  –0.08  Steel Steel 

Code 

            

ness     (2)

 M3 x 0.5 

— 

KFE 

KFSE 

M3 

3 

4 

6 

8 

10 

12 

14 

16 

1.53 

1.53 

4.22 

4.68 

5.56 

4.4

 —  3.6  KFE  KFSE  3.6 

3 

4 

6 

8 

10 

12 

14 

16  1.53  1.53  5.41  5.87  7.14  5.5

 —  4.2  KFE  KFSE  4.2 

3 

4 

6 

8 

10 

12 

14 

16  1.53  1.53 

6.4 

6.81  8.74  7.1

  “F” Minimum Thread Length (Where Applicable) 

Full 

9.5

 

 

Thru 

Type 

Thread 

 

A 

Min. 

Hole Size 

 

  Min. Dist.

  Thread 

Hole 

 

 

or Thru 

 

(Shank)  Sheet 

In Sheet 

C 

E 

Hole C/L

 Size  +.004  Carbon Stainless Hole   

 

 

 

 

(1) (1) (1) 

Max. 

Thick-  +.003 –.000  ±.003 

±.005  to Edge

   –.003  Steel Steel Code  .125  .250  .375  .500  .625  .750  .875  1.00    ness   

 

  (2)

 .112-40 

—  KFE  KFSE  440  4 

8 

12  16  20  24  —  —  .060 .060  .166  .184  .219  .17

 (#4-40)
 .138-32 

—  KFE  KFSE  632  4 

8 

12  16  20  24  28  32  .060 .060  .213  .231  .281  .22

 (#6-32)

 — 

.116 

KFE  KFSE  116 

4 

8 

12 

16 

20 

24 

— 

—  .060  .060  .166 

.184  .219  .17

 — 

.143  KFE  KFSE  143 

4 

8 

12 

16 

20 

24 

28 

32  .060  .060  .213 

.231  .281  .22

  “F” Minimum Thread Length (Where Applicable) 

Full 

.375  ± .016 

.375 Blind

Length “L” ±.005

(Length Code is in 32nds of an inch)

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-10

    

PennEngineering • 

www.pemnet.com

(1)  Blind at shank end with .375” minimum thread length from head end.

(2)  For more information on proximity to bends and distance to other clinch hardware, see 

PEM® Tech Sheet C/L To Edge

.

KFB3™ Broach/Flare-Mount Standoffs

KFB3 –  632  –  12    ET

Type and

Material

Finish

Thread

Code

Length

Code

All dimensions are in inches.

All dimensions are in millimeters.

F

K     C    B

E

A

L

P

PEM® “Two Groove”

(Registered Trademark)

Thread

Size

Type

Thread

Code

Length Code “L” ±.005

(Length code in 32nds of an inch)

A

(shank)

Max.

Sheet

Thickness

Hole Size 

in Sheet

+.005

-.001

B

±.003

C

Max.

E

±.005

K

±.003

P

±.010

Min. Dist. 

Hole C/L

to Edge

(2)

.062 .125

.187 .250 .312 .375 .500 .625 .750

(1)

1.00

(1)

.112-40

(#4-40)

KFB3

440

2

4

6

8

10

12

16

20

—

—

.09

.050-.065

.166

.122

.165

.219

.179

.040

.17

.138-32

(#6-32)

KFB3

632

2

4

6

8

10

12

16

20

24

32

.09

.050-.065

.213

.171

.212

.280

.226

.040

.22

.190-32

(#10-32) KFB3

032

2

4

6

8

10

12

16

20

24

32

.09

.050-.065

.272

.128

.271

.375

.285

.040

.275

.250-32

(1/4-20)

KFB3

0420

2

4

6

8

10

12

16

20

24

32

.09

.050-.065

.335

.183

.331

.437

.348

.040

.335

“F” Min. Thread Length

(Where Applicable)

Full

.375 Blind

Thread

Size x

Pitch

Type

Thread

Code

Length Code “L” ±0.13

(Length code in millimeters)

A

(shank)

Max.

Sheet

Thickness

Hole Size 

in Sheet

+0.13

-0.03

B

±0.08

C

Max.

E

±0.13

K

±0.08

P

±0.25

Min. Dist. 

Hole C/L

to Edge

(2)

M3 x 0.5 KFB3

M3

2

3

4

6

8

10

12

14

16

2.29

1.27-1.65

4.22

3.23

4.2

5.56

4.55

1

4.33

M4 x 0.7 KFB3

M4

2

3

4

6

8

10

12

14

16

2.29

1.27-1.65

6.4

5.23

6.33

8.74

6.68

1

6.36

M5 x 0.8 KFB3

M5

2

3

4

6

8

10

12

14

16

2.29

1.27-1.65

6.9

5.8

6.86

9.53

7.23

1

7

M6 x 1

KFB3

M6

2

3

4

6

8

10

12

14

16

2.29

1.27-1.65

8.5

7.2

8.4

11.1

8.83

1

8.5

“F” Minimum Thread Length

(Where Applicable)

Full

9.5

Part Number Designation

Uni

fie

d

Uni

fie

d

Me

tric

Me

tric

Fasteners For Use With PC Boards

K-11

   

PennEngineering • 

www.pemnet.com

 

 

Top Board

  

Mounting

 

Type  Hole 

A               B  C  H  P  T

   

Diameter .250 .312 .375 .437 .500 .562 .625 .750 .875 1.00 ±.005 ±.003 ±.005 ±.005 ±.005

  

Code

 KSSB 

156 

8  10  12  14  16  18  20  24  28  32  .188  .226  .250  .141  .020

 

 

Top Board

  

Mounting

 

Type  Hole 

A            B C  H P  T

  

Diameter           ±0.13 ±0.08 ±0.13 ±0.13 ±0.13

  

Code

 KSSB 

4MM  8  10  12  14  16  18  20  22 25  4.8  5.74  6.35  3.58  0.51

Length “L” ±0.13

(Length Code is in millimeters)

Mounting Hole A

Mounting Hole B

Edge

C

2

Edge

C

1

Location

Tolerance

PANEL 2 (TOP)

PANEL 1 (BOTTOM)

Length “L” ±.005

(Length Code is in 32nds of an inch)

KSSB™ Broaching Snap-Top® Standoffs

KSSB™ Application Data

All dimensions are in inches.

All dimensions are in millimeters.

(1)   HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.

(2)  Available for thicker boards on special order.

   

  Bottom     Edge 

   Top    Edge

   Hardness  Mounting  Panel Thickness Distance 

Location Hardness Mounting  Panel  Thickness 

Distance

 

Type 

Max. 

Hole B 

Material 

Min. 

C

1

 Min. 

Tolerance 

Max. 

Hole A 

Material 

Range 

C

2

  Min.

  

(1) 

+.003 -.000 

 

 

 

 

 

+.003 -.000 

 

(2)

 

KSSB 

HRB 65 / HB 116 

.213 

PC board .050  .220  ±.005  No Limit 

.156 

PC board 

.040 - .070 

.100

 

 

             

or Metal

Panel 1

Panel 2

   

  Bottom     Edge 

   Top    Edge

   Hardness  Mounting Panel Thickness Distance 

Location Hardness Mounting  Panel  Thickness 

Distance

 

Type 

Max. 

Hole B 

Material 

Min. 

C

1 

Min. 

Tolerance 

Max. 

Hole A 

Material 

Range 

C

2 

 Min.

  

(1)  +0.08          +0.08   (2)

 

KSSB 

HRB 65 / HB 116 

5.41 

PC board 1.27  5.59  ±0.13  No Limit 4 PC board 

1 - 1.8 

2.54

 

 

            

or Metal

Panel 1

Panel 2

All dimensions are in inches.

All dimensions are in millimeters.

KSSB –  156  –  12 

X

Type and

Material

Top Board

Mounting

Hole A

Diameter 

Code

Length

Code

Finish

T

P

H

B

L

C

PEM® Dimple

(Registered Trademark)

Part Number Designation

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-12

    

PennEngineering • 

www.pemnet.com

All dimensions are in inches.

  

 

  Screw  A  Min.         

ØK 

Hole 

Size 

ØD 

Min.

 Thread 

 

Thread  Length  (Shank)  Sheet 

C 

E

1

 E

2

 G

1

 G

2

 H T

1

 T

2

 

in Sheet 

Solder  Driver

  Size 

Type 

Code  Code  Max. Thickness Max. ±.010 Nom ±.025 ±.025 ±.010 Nom. Nom. +.003 

-.000 Pad Size

  .112-40 

SMTPFLSM 440  0  .063  .063  .215 .280 .300 .040 .210  .100  .38  .55 

.220  .340 T15

 (#4-40) 

 

 

1        .100 

.270

  .138-32 

SMTPFLSM 632  0 .063 .063  .247 .310 .320 .040 .240  .100  .42  .62 

.252  .400 T15 

 (#6-32) 

 

 

1        .100 

.300

All dimensions are in millimeters.

  

 

  Screw  A  Min.         

ØK 

Hole 

Size 

ØD 

Min.

 Thread 

 

Thread  Length  (Shank)  Sheet 

C 

E

1

 E

2

 G

1

 G

2

 H T

1

 T

2

 

in Sheet 

Solder  Driver

  Size 

Type 

Code  Code  Max. Thickness Max. ±0.25 Nom ±0.64 ±0.64 ±0.25 Nom. Nom.  +0.08  Pad Size

 

M3 x 0.5 

SMTPFLSM 

M3 

0 1.6 1.6 5.46 7  7.6  1 5.3  2.5  9.6  14  5.6  8.6 T15

  

 

 

1        2.5 

6.8

 

M3.5 x 0.6 

SMTPFLSM 

M3.5 

0 1.6  1.6  6.27 7.9 8.13  1 6.1  2.5  10.7  15.7  6.4  10.2 T15 

  

 

 

1        2.5 

7.62

SMTPFLSM™ ReelFast® Surface Mount Captive Panel Screws

SMTPF  LS 

M  –  440 –  0 

ET

Type

Thread

Code

Driver Anti-cross

Thread

Feature

Length

Code

Finish

Number Of Parts Per Reel

Number Of Parts Per Reel

Packaged on 330 mm recyclable reels. Tape width is 24 mm. Supplied with polyimide patch for vacuum pick up. Reels conform to EIA-481.

 

Thread Size 

Parts Per Reel

 440 

200 

 632 

150

 M3 

200

 M3.5 

150

Stencil Masking Examples

E

1

H

C

A

E

2

T

2

T

1

G

1

G

2

Dimples on head 

designate metric 

thread.

Torx®/slot driver size.

(See chart)

Two Grove 

(Registered 

Trademark).

Shoulder 

provides positive 

stop during 

installation.

Part Number Designation

ØH

ØD

Solder

Pad

Mounting hole 

does not need to 

be plated through.

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-13

   

PennEngineering • 

www.pemnet.com

Available with Torx®

recess on special order.

SMTPR –  6  –  1 

ET

Type

Part Number Designation

For Retainer

Finish

Retainer

Size

Shank

Code

PSHP – 632  –  0 

L 

001

Type

Part Number Designation

For Screw

Cap

Style

(Lobed)

Thread

Code

Length

Code

Color

Code

(Standard 

Black)

  

 

Screw Part Number  

 

            Assembly Dimensions 

 

 

        Screw Dimensions 

 

 

   Retainer Dimensions

 

   

Screw 

Retainer       

Total     A 

Min.

 Thread 

  Thread  Length 

Part 

G 

P 

T

1

 T

2

 Radial  C

1

 E

1

 

L 

T  (Shank) Sheet  B 

C 

E  R

  Size 

Type 

Code 

Code 

Number 

± .025 

± .025 

Nom. 

Nom. 

Float 

±.010 

±.010 

±.015 

Nom. 

Max. 

Thick.  ±.003  Max.  Nom.  ±.005

 

          

 .112-40 

PSHP 440

 0 

SMTPR-6-1

 .188  .000 

.478  .646  .015  .440 .542 

.510 .663

  .060  .060  .167  .249  .375 .325

  (#4-40) 

  1    .248 

.026       

.570 

.723 

  .138-32 

PSHP 632

 0 

SMTPR-6-1

 .188  .000 

.478  .646  .020  .440 .542 

.510 .663

  .060  .060  .167  .249  .375 .325

  (#6-32) 

  1    .248 

.026       

.570 

.723

The colors shown here (codes #002 thru #007) are non-stocked 

standards and available on special order. Since actual cap colors 

may vary slightly from those shown here, we recommend that 

you request samples for color verification. If you require a custom 

color or you need a “color matched” cap, please contact us.

  Std. Black #001 

Red #002 

Orange #003 

Yellow #004

 

Green #005 

Blue #006 

Violet #007

Non-flammable UL 94-V0 plastic caps are available on special order.

All dimensions are in inches.

All dimensions are in millimeters.

Color Capabilities For Type PSHP Screw

SMTPF™ ReelFast® Surface Mount Captive Panel Screws

  

 

Screw Part Number  

 

            Assembly Dimensions 

 

 

        Screw Dimensions 

 

 

   Retainer Dimensions

 

Thread 

  

Screw 

Retainer       

Total     A 

Min.

  Size x 

 

Thread  Length 

Part 

G 

P 

T

1

 T

2

 Radial  C

1

 E

1

 

L 

T  (Shank) Sheet  B 

C 

E  R

  Pitch 

Type 

Code 

Code 

Number 

± 0.64 

± 0.64 

Nom. 

Nom. 

Float 

±0.25  ±0.25 

±0.38 

Nom. 

Max. 

Thick.  ±0.08  Max.  Nom.  ±0.13

 

          

 

M3 x 0.5  PSHP 

M3

 0 

SMTPR-6-1

 4.78  0 

12.14 16.41  .38  11.18 13.77 

12.95 16.84

  1.53  1.53  4.24  6.33  9.53 8.26

 

   1    6.3 

.66       

14.48 

18.36 

 

M3.5 x 0.6 PSHP  M3.5

 0 

SMTPR-6-1

 4.78  0 

12.14 16.41  .51  11.18 13.77 

12.95 16.84

  1.53  1.53  4.24  6.33  9.53 8.26

 

   1    6.3 

.66       

14.48 

18.36

RETAINER

 — Packaged on 330 mm recyclable reels of 

400 pieces. Tape width is 24 mm. Supplied with Kapton® 

patch for vacuum pick up. Reels conform to EIA-481.

SCREW

 — Packaged in bags. Retainers and screws are 

sold separately.

.396”/

10.06 mm

Min.

.250” +.003 –.000

6.35 mm +0.08

Four dimples on 

head designate 

metric thread.

Metal Phillips Recess

#4-40 & M3 = #1

#6-32 & M3.5 = #2

When Assembled

Spring action of 

plastic “fingers” 

holds screw 

in retracted 

position.

PSHP

SMTPR

PC Board

R

E

A

C

B

E

1

L

T

C

1

T

2

T

1

G

P

Patented.

Stencil Masking Examples

Solder

Pad

Mounting hole 

does not need to 

be plated through.

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-14

    

PennEngineering • 

www.pemnet.com

 

      Hole             

Min. 

Dist.

  Thread 

 

Thread 

Screw 

A 

Min. 

Size In 

C 

E 

G 

H 

P 

T

1

 T

2

 

Hole C/L

  Size 

Type 

Code 

Length 

(Shank) 

Sheet 

Sheet 

±.003 

±.010 

±.016 

±.005 

±.025 

Max. 

Nom. 

to Edge

 

   

Code 

Max. 

Thickness 

+.003 

–.000 

         (1)

 

   40        .250  .000

  .112-40 PFK  440  62  .060  .060  .265  .283  .312  .375  .072  .125  .36  .54  .20

  (#4-40)     84        .500  .250

 

   40        .250  .000

  .138-32 PFK  632  62  .060  .060  .281  .299  .344  .375  .072  .125  .36  .54 

.26

  (#6-32)     84        .500  .250

  Thread 

 

Thread 

Screw 

A 

Min. 

Hole Size 

C 

E 

G 

H 

P 

T

1

 T

2

 

Min. Dist.

  Size x 

Type 

Code 

Length 

(Shank) 

Sheet 

In Sheet 

±0.08 

±0.25 

±0.4 

±0.13 

±0.64 

Max. 

Nom. 

Hole C/L

 

Pitch 

  

Code 

Max. 

Thickness 

+0.08 

       

to 

Edge 

(1)

  

 

 

40           6.4    0

 M3 x 0.5 

PFK 

M3 

62 

1.53 

1.53 

6.73 

7.19 

7.92 

9.5 

1.83 

3.2 

9.14 

13.72 

5.08

  

 

 

84 

 

 

 

 

 

12.7 

 

6.4

*Retaining rings are plastic with normal 250°F  / 120°C temperature limit.

(1)  For more information on proximity to bends and distance to other clinch hardware, see 

PEM® Tech Sheet C/L To Edge

.

PFK™ Broaching Captive Panel Screws

All dimensions are in inches.

All dimensions are in millimeters.

Shown here with  

self-clinching mating nut

Diagonal knurl 

identifies metric 

thread sizes

T

2

T

1

P

C

A

G

H

E

Shoulder 

provides 

positive 

stop during 

installation.

PEM® Blue Nylon Ring*

(Trademark)

PFK  – 632  – 62

Type

Thread

Code

Screw

Length

Code

Part Number Designation

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-15

   

PennEngineering • 

www.pemnet.com

 

 

 

 

        

Hole 

Max. 

 

 

 

Min.

 

Thread 

 

Thread 

      A 

Min. 

Size 

in 

Hole 

 

 

 

Dist.

 

Size 

Type 

Code 

      

(Shank) 

Sheet 

Sheet 

Size 

in 

H 

S 

T 

Hole 

C/L

  

 

 

      

Max. 

Thickness 

+.003 

Attached 

±.010 

Max. 

±.005 

to 

Edge

  

 

 

.250 .312  .375 .500 .625 .750

    –.000 

Parts  (1)  (2)

 .112-40 

KFH 440  4 

5 

6 

8 

10 

12  .065  .060  .120  .145  .180  .09  .020  .15

  (#4-40)
 .138-32 

KFH 632  4 

5 

6 

8 

10 

12  .065  .060  .140  .170  .200  .09  .020  .19

 (#6-32)
 .164-32 

KFH 832  4 

5 

6 

8 

10 

12  .065  .060  .166  .195  .225  .09  .020  .20

 (#8-32)
  .190-32 

KFH 032  4 

5 

6 

8 

10 

12  .065  .060  .189  .220  .250  .09  .020  .20

  (#10-32)

Length “L” ±.010

(Length Code is in 16ths of an inch)

 

 

 

 

        

Hole 

Max. 

 

 

 

Min.

 

Thread 

 

Thread 

      A 

Min. 

Size 

in 

Hole 

 

 

 

Dist.

 

Size 

x 

Type 

Code 

      

(Shank) 

Sheet 

Sheet 

Size 

in 

H 

S 

T 

Hole 

C/L

 Pitch 

 

 

      

Max. 

Thickness 

+0.08 

Attached 

±0.25 

Max. 

±0.13 

to 

Edge

  

 

 

            Parts  (1)  (2)

  M3 x 0.5 

KFH 

M3 

6 

8 

10 

12 

15 

18 

1.65 

1.53 

3 

3.7 

4.58 

2.3 

0.51 

3.8

  M4 x 0.7 

KFH 

M4 

6 

8 

10 

12 

15 

18 

1.65 

1.53 

4.2 

4.8 

5.74 

2.3 

0.51 

5.1

  M5 x 0.8 

KFH 

M5 

6 

8 

10 

12 

15 

18 

1.65 

1.53 

5 

5.8 

6.6 

2.3 

0.51 

5.3

Length “L” ±0.25

(Length Code is in millimeters)

KFH™ Broaching Studs

All dimensions are in inches.

All dimensions are in millimeters.

KFH – 632  –  8   ET

Type and

Material

Part Number Designation

Finish

Thread

Code

Length

Code

(1)  Threads are gaugeable to within 2 pitches of the “S” Max. dimension. A class 3B/5H maximum material commercial nut shall pass up to the “S” Max. dimension.

(2)  For more information on proximity to bends and distance to other clinch hardware, see 

PEM® Tech Sheet C/L To Edge

.

S

T

H

A

L

PEM® Dimple (Registered Trademark)

Uni

fie

d

Me

tric

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

K-16

    

PennEngineering • 

www.pemnet.com

 

        

Min. 

Hole

 Thread 

 

Thread  Height  Length  Length  Sheet 

Size 

A 

B 

C 

D 

Height 

G 

J 

K 

N 

P 

S

P 

T

 Size  Type  Code  Code  Code  L  Thick-  In 

Sheet  ±.006 ±.006  ±.006 ±.006  F  ±.006 Nom. Nom.  Max. Max. ±.003 Nom.

 

         ±.005 

ness 

+.003 

–.000 

     

±.006

  .086-56 

SMTRA  256  8 

6  .188  .040  .053 

.218  .040  .060  .140  .250  .345  .020  .030  .048 .040  .157 .105

 

(#2-56)

  .112-40 

SMTRA  440  9 

6  .188  .040  .053  .250  .050  .065  .160  .281  .390  .020  .030  .048 .040  .188 .125

  (#4-40)

  .138-32 

SMTRA  632  10 

8  .250  .040  .053 

.312  .050  .065  .205  .312  .450  .020  .030  .048 .040  .250 .145

  (#6-32)

  .164-32 

SMTRA  832  12 

9  .281  .040  .053 

.375  .050  .075  .250  .375  .535  .020  .030  .048 .040  .312 .195

  (#8-32)

 

         Min. Hole

  Thread 

  Thread Height Length Length  Sheet 

Size 

A 

B 

C 

D  Height  G 

J 

K 

N 

P 

S

P 

T

 

Size x 

Type 

Code 

Code 

Code 

L 

Thick- 

In Sheet 

±0.15 

±0.15 

±0.15 

±0.15 

F 

±0.15  Nom.  Nom. 

Max. 

Max.  ±0.08  Nom.

 

Pitch       

±0.13 

ness 

+0.08      

±0.15 

  M2 x 0.4  SMTRA M2  6  5 

5 

1 

1.35 

5.5  1  1.5  3.5  6  8.4  0.5  0.75 1.22  1  4  2.65

  M2.5 x 0.45  SMTRA M25  6 

5 

5 

1 

1.35 

5.5  1 

1.5  3.5  6  8.4  0.5  0.75  1.22  1 

4  2.65

  M3 x 0.5 

SMTRA M3  7  5 

5 

1 

1.35  6.35  1.25  1.65  4 

7  9.75  0.5  0.75  1.22  1  4.75 3.2

  M4 x 0.7 

SMTRA M4  9  7 

7 

1 

1.35  9.53  1.25  1.65  6.35  9  13.1  0.5  0.75 1.22  1  7.9  4.8

  Thread  Pad Width  Pad Length  Hole Spacing  Hole Size

  Code P

A

 P

L

 S

H

 

In Sheet

 

 

Min. 

Min. 

±.002 

+.003 –.000

 256 

.262 

.171 

.157 

.053

 440 

.294 

.171 

.188 

.053

 632 

.356 

.233 

.250 

.053

 832 

.419 

.264 

.312 

.053

  Thread  Pad Width  Pad Length  Hole Spacing  Hole Size

  Code P

A

 P

L

 S

H

 

In Sheet

  

Min.  Min. 

±0.05 

+0.08

 M2 

6.62 

4.57 

4 

1.35

 M25 

6.62 

4.57 

4 

1.35

 M3 

7.47 

4.57 

4.75 

1.35

 M4 

10.65 

6.57 

7.9 

1.35

T

A

C

F

B

G

D

J

K

N

P

S

P

L

Grooves identify 

unified thread

 

Part 

Parts 

Pitch  Tape Width

 

Number 

Per Reel  (mm) 

(mm)

 SMTRA256-8-6 

375 

16 

24

 SMTRA440-9-6 

300 

16 

24

 SMTRA632-10-8 

200 

20 

32

 SMTRA832-12-9 

200 

20 

32

 SMTRAM2-6-5 

375  16 

24

 SMTRAM25-6-5 

375 

16 

24

 SMTRAM3-7-5 

300  16 

24

 SMTRAM4-9-7 

200  20 

32

Stencil Masking Examples

Solder Pad

P

A

P

L

S

H

Solder pad can be flush to edge.

Mounting holes do not need to be plated through.

SMTRA™ ReelFast® Surface Mount Right Angle (R’angle®) Fasteners

SMTRA   256  –  8  –  6  ET

Type

Length

Code

Thread

Code

Height

Code

Finish

All dimensions are in inches.

All dimensions are in millimeters.

Patented.

Part Number Designation

Fasteners For Use With PC Boards

K-17

   

PennEngineering • 

www.pemnet.com

SFK™ SpotFast® Clinch/Broach Mount Fasteners

(1)  Fastener will provide flush application at minimum sheet thickness.

(2)  For more information on proximity to bends and distance to other clinch hardware, see 

PEM® Tech Sheet C/L To Edge

.

Patented.

Panel 1

Panel 2

Metal

PCB/plastic

Type SFK joining metal to PCB/plastic.

 

 

                                          Panel 1 

 

                                        Panel 2 

     

Min. 

Dist.

 

Type 

 

Thickness 

Mounting Hole 

Thickness 

Mounting Hole 

 

C

2

 

 

 

Hole C/L

 

and 

Thickness 

±0.08 mm / 

+0.08 mm / 

Min. 

+0.08 mm / 

C

1

 

±0.08 mm / 

E 

 L 

to Edge

 

Size 

Code 

±.003” 

+.003” –.000” 

(1) 

+.003” –.000” 

Max. 

±.003” 

Max. 

 Max. 

(2)

  

  mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in.

 SFK-3 

0.8 

0.8  .031  3 

.118  1.6  .063  2.5  .098  2.98  .117  2.9  .114  3.53  .139  2.31  .091  3  0.12

 SFK-3 

1.0 

1  .039  3 

.118  1.6  .063  2.5  .098  2.98  .117  2.9  .114  3.76  .148  2.51  .099  3  0.12

 SFK-3 

1.2 

1.2  .047  3 

.118  1.6  .063  2.5  .098  2.98  .117  2.9  .114  3.76  .148  2.72  .107  3  0.12

 

SFK-3  1.6  1.6 .063  3  .118 1.6 .063 2.5 .098 2.98 .117  2.9 .114 3.76 .148 3.12 .123 3 0.12

 

SFK-5  0.8  0.8 .031  5  .197 1.6 .063 4.5 .177 4.98 .196 4.9 .193 5.56 .219 2.31 .091 5.1 0.20

 

SFK-5  1.0  1  .039  5  .197 1.6 .063 4.5 .177 4.98 .196 4.9 .193 5.56 .219 2.51 .099 5.1 0.20

 

SFK-5  1.2  1.2  .047  5  .197 1.6  .063 4.5 .177 4.98 .196  4.9 .193 5.56 .219 2.72 .107 5.1 0.20

 SFK-5  1.6  1.6 .063  5  .197 1.6 .063 4.5 .177 4.98 .196 4.9 .193 5.56 .219 3.12 .123 5.1 0.20

Metal

Plastic

Can be used as a single flush-mounted pivot 

point. For more information, please contact 

techsupport@pemnet.com

C

2

C

1

L

E

PEM® Dimple

(Registered Trademark)

SFK  –  3  –  0.8 –  ZI

Type

Finish

Panel 1

Mounting 

Hole Code

Thickness

Code

Part Number Designation

Fasteners For Use With PC Boards

K-18

    

PennEngineering • 

www.pemnet.com

  

Threads (1) 

Fastener Materials 

Standard Finishes 

Optional Finish 

For Use in Sheet Hardness: (3)

 

 

         

Electro-Plated 

 

Electro-Plated

   

 

 

 

 

 

 

 

 

Tin ASTM 

 

Tin ASTM

   

Internal,  External, 

 

 

 

 

Nylon, 

 

B 545, Class B 

 

B 545, Class B 

 

 

 

 

 

Aluminum,

 

 

ASME 

ASME  

300   

Temp. 

Passivated 

With 

Clear 

 

With 

Clear      

Acrylic,

   

B1.1 2B/  B1.1 2A/  Lead-Free  Series  CDA-510 

 

Limit 

and/or 

Preservative 

 

Preservative 

 

HRB 70 /  HRB 65 /  HRB 60 /  HRB 55 /  Castings,

   

ASME 

ASME 

Carbon  Stainless  Phosphor 

 

200˚ F/  Tested Per 

Coating, 

No 

Coating, 

Black  HB 125  HB 116  HB 107  HB 96  Polycarbonate,

         Type 

B1.13M 6H  B1.13M 6g  Steel 

Steel 

Bronze  Brass  93˚ C  ASTM A380  annealed (4) Finish annealed 

(4)  Nitride  or Less  or Less  or Less  or Less  and PC board

 KF2 

•  •        

•         •   •

 KFS2 

•    •     • 

       •     •

 KFE 

•  •        

•         •   •

 KFSE 

•    •     • 

       •     •

 KFB3 

•        •    

•         •     •

 

KSSB 

     

•    

  •  •     •     •

 KFH 

 

•   •     

•          • •

 PFK
 

Retainer     

•     • 

      •    • •

 Screw 

 

•   •       • 

      •

 

Spring 

   

• 

  Retaining 

Ring       

•

  Part Number Codes For Finishes  

 

 

 

 

 

None 

ET 

X 

ET 

BN

(1)  For plated studs, Class 2A/6g, the maximum major and pitch diameter, after plating, may equal basic sizes and can be gauged to Class 3A/6h, per ASME B1.1 Section 7, 

Paragraph 2 and ASME B1.13M, Section 8, Paragraph 8.2.

(2)  See PEM Technical Support section of our web site for related plating standards and specifications.

(3)   HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.

(4)  Optimal solderability life noted on packaging.

(5)  ABS cap on PSHP screw has a temperature limit of 200˚ F / 93˚ C.

(6)  The tin deposit on type SMTSOB meets the requirements of ASTM B545, Class A and although the copper and nickel barrier layers used under the tin do not strictly 

comply with ASTM B545 thickness requirements they have proven effective at preventing zinc migration and providing the specified solderable shelf life.

Material And Finish Specifications

 Threads 

(1) 

Fastener Materials 

Standard Finishes (2) 

For Use in Sheet Hardness: (3)

 

 

         

  Electro-Plated

   

 

Internal, 

External, 

 

 

 

 

 

Zinc Plated 

Tin ASTM 

Bright

   

 

ASME 

ASME 

 

 

300 

 

 

per ASTM B633, 

B 545, Class A 

Nickel

   

Miniature 

B1.1 2B/ 

B1.1 2A/ 

Lead-Free  Hardened 

Series 

 

 

SC1 (5µm), 

With Clear 

Over 

HRB 80 /

   

ISO 1501, 

ASME 

ASME 

Carbon 

Carbon 

Stainless 

 

Zinc 

Type III, 

Preservative 

Copper 

HB 150

      Type 

4H6 

B1.13M 6H 

B1.13M 6g 

Steel 

Steel 

Steel 

Brass 

Diecast 

Colorless 

Coating, annealed (4) 

Flash 

or less 

PC board

 

SMTSO

 

• •  

•    

  

• 

 

   

•

 

  

 SMTSOB 

 

•      

• 

  

(6)

     •

 

SMTBSO  

•   •    

  

• 

   

•

 SMTRA 

 

• 

 

 

 

 

 

• 

 •  

 •

 SMTPFLSM

 Retainer 

 

 

 

•    

  

• 

   

•

 Screw 

 

 

•  •   

 •

 Spring 

 

 

 

 

 

•

 PSHP 

(5)

      

•    

  

 

•

 SMTPR 

 

 

 

•    

  

• 

   

•

 SFK 

 

 

 

•         • 

 

 

• 

•

 

SMTSSS     

•    

  

• 

   

•

 

SMTSK      

•    

  

• 

   

•

  Part Number Codes For Finishes   

 

 

 

 

 

 

ZI 

ET 

CN

S1 to S1.4

0-80 to 8-32/

M1.6 to M4

Fasteners For Use With PC Boards

K-19

   

PennEngineering • 

www.pemnet.com

KSSB™/KFH™ Fasteners

1.  Prepare properly sized mounting hole in board.

2.  Place fastener into mounting hole as shown.

3.   With installation punch and anvil surfaces parallel, apply squeezing 

force until head contacts the board.

PUNCH

D

ANVIL

L Min.

KFH

ANVIL

L + .2”/

5.1 mm Min.

PUNCH

KSSB

D

PUNCH

ANVIL

KF2/KFS2/ 

KFE/KFSE

KF2™/KFS2™/KFE™/KFSE™/ PFK™ Fasteners

1.  Prepare properly sized mounting hole in board.

2.  Place fastener into the anvil hole and place the mounting hole over the shank of the 

fastener as shown in drawing.

3.   With installation punch and anvil surfaces parallel, apply squeezing force until 

shoulder contacts the board.

Installation

PEMSERTER® Installation Tooling 

(1)

 

 

Thread 

 Anvil Part 

Punch Part

 Type 

Code 

Number  Number

  KF2/KFS2 080  8015899
 KF2/KFS2  256/440/M2/M2.5/M3  975200904300
 KF2/KFS2 

632/M3.5 

975200035  975200048

 KF2/KFS2 

832/M4 

975200037

 KF2/KFS2 

032/M5 

975200905300

PEMSERTER® Installation Tooling 

(1)

 

 

Thread 

 Anvil Part 

Punch Part

 

Type 

Code 

Number Number

  KFE/KFSE 

440/116 -4 to -8 

975200846300

  KFE/KFSE 

440/116 -10 to -12 

975200847300

  KFE/KFSE 

440/116 -16 to -20 

975200848300

  KFE/KFSE 

440/116 -20 to -24 

975200882300

  KFE/KFSE 

M3 -3 to -6 

975200846300

  KFE/KFSE 

M3 -8 to -10 

975200847300

  KFE/KFSE 

M3 -12 to -14 

975201222300 

975200048

  KFE/KFSE 

M3 -14 to -16 

975200848300

  KFE/KFSE 

632/143 -4 to -8 

975200849300

  KFE/KFSE 

632/143 -10 to -12 

975200850300

  KFE/KFSE 

632/143 -16 to -20 

975200851300

  KFE/KFSE 

632/143 -22 to -24 

975200883300

  KFE/KFSE 

632/143 -28 to -32 

975200884300

  KFE/KFSE 

3.6 -3 to -6 

975200849300

  KFE/KFSE 

3.6 -8 to -10 

975200850300

  KFE/KFSE 

3.6 -12 to -16 

975200851300

  KFE/KFSE 

4.2 -2 

975201216300 

975200048

  KFE/KFSE 

4.2 -3 to -6 

975201217300

  KFE/KFSE 

4.2 -8 to -10 

975201218300

  KFE/KFSE 

4.2 -12 to -14 

975201220300

  KFE/KFSE 

4.2 -14 to -16 

975201219300

PFK

Thread Dia. +.080”/2mm

Max. Screw

Extension

PEMSERTER® Installation Tooling 

(1)

 

 

Thread 

 Anvil Part 

Punch Part

 Type 

Code 

Number  Number

  PFK 

440/M3 

975200026 975200060

  PFK 

632 

975200027 975200061

PEMSERTER® Installation Tooling 

(1)

 

Part 

D  Punch Anvil

  Number  +.003” -.000”  Part No. 

Part No.*

 KFH-440-L 

.113” 

 

970200006300

 KFH-632-L 

.140” 

975200048  970200007300

 KFH-832-L 

.166” 

 

970200008300

 KFH-032-L 

.191” 

 

970200009300

 

Part 

D  Punch Anvil

  Number 

+0.08mm 

Part No. 

Part No.*

 KFH-M3-L 

3.1mm 

 

970200229300

 KFH-M4-L 

4.1mm  975200048  970200019300

 KFH-M5-L 

5.1mm 

 

970200008300

 

Part 

D 

Punch  Anvil for material  Anvil for material

  Number  +.003” -.000”/  Part No.  .050” / 1.27mm to 

greater than

 

 

+0.08mm 

 

 .065” / 1.65mm 

.065” / 1.65mm

 KSSB-156-L 

.216” 

975200048 8022167 

970200015300

 KSSB-4mm-L 

5.49mm

PEMSERTER® Installation Tooling 

(1)

(1) 

Click here

 for a quote on Haeger® custom installation tooling.

(1) 

Click here

 for a quote on Haeger® custom installation tooling.

PUNCH

ANVIL

Fasteners For Use With PC Boards

K-20

    

PennEngineering • 

www.pemnet.com

(1) PennEngineering manufactures and stocks the installation tooling for KFB3 fasteners. 

Click here

 for a quote on Haeger® custom installation tooling.

KFB3™ Fasteners

1.  Prepare properly sized mounting hole in board.

2.  Place fastener into the anvil hole and place the mounting hole over the shank of the fastener as shown in diagram.

3.   Using a punch flaring tool and a recessed anvil, apply squeezing force until the shoulder of the fastener contacts the board. As 

the fastener seats itself in the proper position, the punch tool will flare the extended portion of the shank outward to complete the 

installation. The combination of broaching and flaring provides high pushout performance.

ANVIL

PUNCH

KFB3

AFTER

BEFORE

SFK™ Fasteners

Step 1.  Prepare properly sized mounting hole in both panels.

Step 2.  Using only Panel 1, with the punch and anvil surfaces 

parallel, apply squeezing force until the fastener is flush 

with the top of Panel 1.

Step 3.  Place Panel 2 over fastener and apply squeezing force.

Step 2

C

Panel 1

Metal

Punch

Anvil

Step 3

Punch

Anvil

Panel 1

Metal

Panel 2

PCB/plastic

NOTE:  Fastener can be installed in both sheets at once when metal panel is adequately soft 

compared to the non-metal panel. E-mail 

techsupport@pemnet.com

 for more information.

  

C

 Size 

±0.13/±.003 

Punch 

Anvil

 

 

(mm) / (in.) 

Part No. 

Part No.*

 

SFK-3 

3.05 / .120 

975200048 

970200229300

 

SFK-5 

5.05 / .199 

975200048 

970200020300

* Part number for anvil used in Step 2

PEMSERTER® Installation Tooling 

(1)

PEMSERTER® Installation Tooling 

(1)

(1) 

Click here

 for a quote on Haeger® custom installation tooling.

Thread

Size

Length

Code

Anvil

Punch

(Flaring Tool)

#4-40

-2

975201213300

975201231400

#4-40

-4 to -8

975200846300

#4-40

-10 to -12

975200847300

#4-40

-16 to -20

975200848300

#4-40

-20 to -24

975200882300

#6-32

-2

975201215300

975201232400

#6-32

-4 to -8

975200849300

#6-32

-10 to -12

975200850300

#6-32

-16 to -20

975200851300

#6-32

-22 to -24

975200883300

#6-32

-28 to -32

975200884300

#10-32

-2

8026682

8026680

#10-32

-4 to -8

8026683

#10-32

-10 to -12

8026684

#10-32

-16 to -20

8026685

#10-32

-20 to -24

8026686

#10-32

-28 to -32

8026687

1/4-20

-2

8026688

8026681

1/4-20

-4 to -8

8026689

1/4-20

-10 to -12

8026690

1/4-20

-16 to -20

8026691

1/4-20

-20 to -24

8026692

1/4-20

-28 to -32

8026693

Thread

Size

Length

Code

Anvil

Punch

(Flaring Tool)

M3

-2

975201213300

975201231400

M3

-3 to -6

975200846300

M3

-8 to -10

975200847300

M3

-12 to -14

975201222300

M3

-14 to -16

975200848300

M4

-2

975201216300

975201221400

M4

-3 to -6

975201217300

M4

-8 to -10

975201218300

M4

-12 to -14

975201220300

M4

-14 to -16

975201219300

M5

-2

8026670

8026680

M5

-3 to -6

8026671

M5

-8 to -10

8026672

M5

-12 to -14

8026673

M5

-14 to -16

8026674

M6

-2

8026675

8026681

M6

-3 to -6

8026676

M6

-8 to -10

8026677

M6

-12 to -14

8026678

M6

-14 to -16

8026679

Installation Notes

•  For best results we recommend using a HAEGER® or PEMSERTER® press for installation of PEM 

self-clinching fasteners. Please check our website for more information.

•  Visit the Animation Library on our website to view the installation process 

for select products

.

Fasteners For Use With PC Boards

K-21

   

PennEngineering • 

www.pemnet.com

Solder paste applied to 

pad on PCB.

Solder fastener in place 

using standard surface 

mount techniques.

Polyimide patch applied here 

for vacuum pick up.

Solder paste applied 

to pad on PCB.

Solder fastener in place 

using standard surface 

mount techniques.

Screw snapped in place.

Polyimide patch applied 

here for vacuum pick up.

Solder paste applied 

to pad on PCB.

Solder fastener in place 

using standard surface 

mount techniques.

Undercut to accept 

solder fillet and permit 

flush to edge installation.

Flat top for vacuum pick up.

SMTSO™ Nuts And Standoffs

SMTPF™ Captive Panel Screws

Smtra™ R’angle® Fasteners

Installation

SMTPFLSM™ Captive Panel Screws

SMTSS™ Standoffs

Solder fastener in place using 

standard surface mount techniques.

Polyimide patch applied here 

for vacuum pick up.

Solder paste applied 

to pad on PCB.

SMTSK™ Standoffs

Solder paste applied  

to pad on PCB.

Solder fastener in place 

using standard surface 

mount techniques.

Installs in retracted/

unfastened position

Solder paste applied to 

pad on PCB.

Polyimide patch applied here 

for vacuum pick up.

Solder fastener in place using 

standard surface mount techniques.

Solder paste 

applied to pad 

on PCB.

Solder fastener in 

place using standard 

surface mount 

techniques.

SMTBSO™ Fasteners

Fasteners For Use With PC Boards

K-22

    

PennEngineering • 

www.pemnet.com

For Additional HAEGER® and PEMSERTER® Tooling Information / Part Numbers

Or download the  

HAEGER WIZZARD

 Phone App

Go to 

haeger.com

 to access  

the Auto and Manual Tooling Wizards

} }

HAEGER® MANUAL TOOLING CATALOG

PEMSERTER® MANUAL TOOLING CATALOG

HAEGER® AUTO TOOLING CATALOG

PEMSERTER® AUTO TOOLING CATALOG

Uni

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d

Uni

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Me

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Fasteners For Use With PC Boards

K-23

   

PennEngineering • 

www.pemnet.com

 

Panel 1 (.060” FR-4 Fiberglass) 

(4)

 

Panel 2 (Removable) 

(4)

 Type 

Installation 

Pushout 

Max. First On 

Min. First Off 

Min. 15th Off

 

 

(lbs.) 

(lbs.) 

Force (lbs.) 

Force (lbs.) 

Force (lbs.)

 

KSSB 500  110  13  3.0 1.0

(1)  Published installation forces are for general reference. Actual set-up and confirmation of complete installation should be made by observing proper seating of 

fastener as described in the installation steps. Other performance values reported are averages when all proper installation parameters and procedures are 

followed. Variations in mounting hole size, sheet material, and installation procedure may affect performance.  Performance testing this product in your application 

is recommended.  We will be happy to provide technical assistance and/or samples for this purpose.

(2)  These are typical values for parts installed in drilled mounting holes. Punched mounting holes yield values approximately 15% less.

(3)  Not applicable.

(4)  See Application Data drawing on page 10.

(5)  The maximum carrying current for each of the above fasteners is calculated based on a heat transfer coefficient of 20 W/m² °K and a maximum temperature rise 

of 15°C / 27˚F above ambient.

 

Panel 1 (1.5 mm FR-4 Fiberglass) 

(4)

 

Panel 2 (Removable) 

(4)

 Type 

Installation 

Pushout 

Max. First On 

Min. First Off 

Min. 15th Off

 

 

(kN) 

(N) 

Force (N) 

Force (N) 

Force (N)

 KSSB 

2.2 

484 

57.7 

13.3 

4.4

KSSB™ Broaching Snap-Top® Standoffs

 

 

 

Max. Nut 

 Test Sheet Thickness 

 

 

 

Rated

 Type 

Thread 

Tightening Torque 

& 

Installation 

Pushout 

(2)

 

Torque-out 

Current

  

Code 

(in. lbs.) 

 Test Sheet Material 

(lbs.) 

(lbs.) 

(in. lbs.) 

Amps (5)

  

256 (3)  .060” FR-4 Panel 

400 

60 

6 

 —

  KF2, KFS2 

440 

(3) 

.060” FR-4 Panel 400  65  15  —

  KFE, KFSE 

632 

(3) 

.060” FR-4 Panel 500  80  30  —

 

 

832 

(3) 

.060” FR-4 Panel 700  95  35  —

 

 

032 

(3) 

.060” FR-4 Panel 700  100  40  —

  

440 

(3) 

.060” FR-4 Panel 1000  140  18  42

 

KFB3 

632 

(3) 

.060” FR-4 Panel 1500  170  28  88

 

 

032 

(3) 

.060” FR-4 Panel 1600  180  30 100

 

 

0420 

(3) 

.060” FR-4 Panel 1700  188  42 150

  

440 

4 

.060” FR-4 Panel 400  65 

7  14

 

KFH

 

632 

8 

.060” FR-4 Panel 400 

70  11  19

  

832 

15 

.060” FR-4 Panel 400  80  16  24

 

 

032 

18 

.060” FR-4 Panel 400  90  17  30

 

PFK 

440 

(3) 

.060” FR-4 Panel 250  55  (3)  —

  

632 

(3) 

.060” FR-4 Panel 400  60  (3)  —

 

 

 

Max. Nut 

 Test Sheet Thickness 

 

 

 

Rated

 Type 

Thread 

Tightening Torque 

& 

Installation 

Pushout 

(2)

 

Torque-out 

Current

  

Code 

(N•m) 

 Test Sheet Material 

(kN) 

(N) 

(N•m) 

Amps (5)

 

 

M2 

(3) 

1.5 mm FR-4 Panel 

2.2 

267 

0.68 

—

  KF2, KFS2 

M3 

(3) 

1.5 mm FR-4 Panel 2.2 

290 

1.7  —

 

KFE, KFSE M4 

(3) 

1.5 

mm FR-4 Panel 2.2 

420  3.4  —

 

 M5 

(3) 

1.5 

mm FR-4 Panel 2.9 

440  4.5  —

  

M3 

(3) 

1.5 

mm FR-4 Panel 4.4 

560  2.03  42

 

KFB3

 M4 

(3) 

1.5 

mm FR-4 Panel 6 

680  3.2 88

  

M5 

(3) 

1.5 

mm FR-4 Panel 7.1 

800  3.5 100

  

M6 

(3) 

1.5 

mm FR-4 Panel 7.6 

835  4.8 150

  

M3 

0.45 

1.5 

mm FR-4 Panel 1.8 

285  0.79 15

 KFH 

M4 

1.6 

1.5 

mm FR-4 Panel 1.8 

355  1.8  23

  

M5 

2.1 

1.5 

mm FR-4 Panel 1.8 

400  1.92  32

 PFK 

M3 

(3) 

1.5 

mm FR-4 Panel 1.1 

245  (3)  —

KF2™/KFS2™/KFE™/KFSE™/KFB3™/KFH™/PFK™ Broaching And Broach/Flare Mount Fasteners

Performance Data

(1)

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Fasteners For Use With PC Boards

K-24

    

PennEngineering • 

www.pemnet.com

SFK™ SpotFast® Clinch/Broach Mount Fasteners

SMTSO™/SMTSOB™ Fasteners

(1)(2)

(1)  With lead-free paste. Average values of 30 test points. The data presented here is for general comparison purposes only. Actual performance is dependent upon 

application variables. We will be happy to provide samples for you to install. If required, we can also test your installed hardware and provide you with the performance 

data specific to your application.

(2)  Further testing details can be found in our website’s literature section.

(3)  In most applications, pullout strength of the SFK fastener in Panel 1 exceeds pushout strength of Panel 2.

(4)  Torque values shown will produce a preload of 70% minimum tensile with a nut factor “k” equal to .1.

(5)  Failure occurred at the solder joint. Screw retention strength is greater than the retainer.

(6)  The maximum carrying current for each of the above fasteners is calculated based on a heat transfer coefficient of 20 W/m² °K and a maximum temperature rise of 15°C / 

27˚F  above ambient.

SMTRA™ R’ANGLE® Fasteners

(1)(2)

 

Part 

Test Sheet Material - .062” Single Layer FR-4

 

Number 

Pushout (lbs.) 

Side Load (lbs.)

 SMTRA256-8-6 

51.7 

7.1

 SMTRA440-9-6 

89.5 

10.8

 SMTRA632-10-8 

110.3 

8.4

 SMTRA832-12-9 

137.2 

21.2

  Type 

Thick- 

Installation into Panel 1 

Installation into Panel 2 

Pushout of Panel 2  (3)

  and 

ness      

Cold-rolled Steel 

FR-4 Fiberglass

 Size  Code

  

 

kN lbs. kN lbs.  N lbs.

 SFK-3  0.8 

6.2 

1400 

1.8 

400 

200 

45

 SFK-3  1.0 

8 

1800 

1.8 

400 

200 

45

 SFK-3  1.2 

8.9 

2000 

1.8 

400 

200 

45

  SFK-3 1.6  10.2  2300 

1.8 

400 

200 

45

 SFK-5  0.8 

11.1 

2500 

1.8 

400 

400 

90

 SFK-5  1.0 

13.5 

3000 

1.8 

400 

400 

90

 SFK-5  1.2 

15.6 

3500 

1.8 

400 

400 

90

 SFK-5  1.6 

17.8 

4000 

1.8 

400 

400 

90

Testing Conditions For Surface Mounted Fasteners
Oven

 

Quad ZCR convection oven w/ 4 zones 

Spokes

  2 Spoke Pattern

High Temp

 

473˚F / 245˚C 

Paste

  Amtech NC559LF Sn96.5/3.0Ag/0.5Cu (SAC305)

 (SMTSO, SMTRA, SMTPR)

Board Finish

 

62% Sn, 38% Pb 

 

Alpha CVP-390 Sn96.5/3.0Ag/0.5Cu (SAC305) 

(SMTPFLSM, SMTSS, SMTSK, SMTBSO)

Screen Printer

  Ragin Manual Printer 

Stencil

  .0067” / 0.17 mm thick

 (SMTSO, SMTRA, SMTPR, SMTSS, SMTSK, SMTBSO)

Vias

 

None 

 

.005” / 0.13 mm thick

 (SMTPFLSM)

SMTSS™ ReelFast® SNAP-TOP® Standoffs

(1)(2)

 

Type, Material 

 Test Sheet Material 

Pushout 

Max. Snap-on Force

 

and Size

 SMTSSS-156 

.062" Single Layer FR-4 

113 lbs. 

20 lbs.

 

SMTSSS-4MM 

1.58 mm Single Layer FR-4 

500 N 

89 N

Panel 1 (Bottom)

Panel 2 (Top)

 

Type and Size 

 Test Sheet Material 

Pushout

 SMTSK-6060 

.062" Single Layer FR-4 

113 lbs.

 

SMTSK-61.5 

1.58 mm Single Layer FR-4 

500 N

Panel 1 (Bottom)

SMTSK™ Keyhole® Standoffs

(1)(2)

 

Thread/ 

Test Sheet Material  - .062” Single Layer FR-4 

Rated

 Type  Thru-hole  Pushout  Pushout  Torque-out Torque-out  Current

 

 

Code 

(lbs.) 

(N) 

(in. lbs.) 

(N•m) 

Amps 

(6)

 

SMTSO 

080 85.1  378.7  4.94  0.56 11

 

SMTSOB 

      —

 

SMTSO 

256 56.5  251  8.56  1 25

 

SMTSOB 

      40

 

SMTSO 

440 56.5  251  8.56  1 22

 

SMTSOB 

      36

 SMTSO  632 93.5  416  13.83  1.6 34

 

SMTSOB 

      55

 SMTSO  832 151.1  672  26.96  3 47

 

SMTSOB 

      76

 SMTSO 

116 

— —  — — 22

 

SMTSOB 

      37

 SMTSO 

143 

— —  — — 33

 

SMTSOB 

      55

 SMTSO 

M1 85.1 378.7  4.94  0.56 11

 

SMTSOB 

      —

 SMTSO  M1.2 85.1  378.7  4.94  0.56 10

 

SMTSOB 

      —

 SMTSO  M1.4 85.1  378.7  4.94  0.56 10

 

SMTSOB 

      —

 SMTSO  M1.6 85.1  378.7  4.94  0.56 10

 

SMTSOB 

      —

 SMTSO 

M3 56.5  251  8.56  1 22

 

SMTSOB 

      36

 SMTSO  M3.5 93.5  416  13.83  1.6 34

 

SMTSOB 

      55

 SMTSO 

M4 151.1  672  26.96  3 47

 

SMTSOB 

      76

 SMTSO 

3.1 — —  — — 22

 

SMTSOB 

      36

 SMTSO 

3.6 

— —  — — 33

 

SMTSOB 

      55

 SMTSO 

4.2 

— —  — — 46

 

SMTSOB 

      75

 

Part 

Test Sheet Material - 1.58 mm Single Layer FR-4

 

Number 

Pushout (N) 

Side Load (N)

 SMTRAM2-6-5 

418.2 

56.8

 SMTRAM25-6-5 

216.5 

36.9

 SMTRAM3-7-5 

257.6 

41.3

 SMTRAM4-9-7 

369.3 

73.3

Part

Number

Test Sheet Material  - .062”/1.58mm Single Layer FR-4

Rated Current

Amps 

(6)

Pull Off

(lbs.)

Pull Off

(N)

Torque-out

(in. lbs.)

Torque-out

(N•m)

SMTBSO-440-6

61

—

15.4

—

12

SMTBSO-M3-4

—

270

—

1.75

22

SMTBSO™ Fasteners

(1)

Uni

fie

d

Me

tric

Fasteners For Use With PC Boards

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PennEngineering • 

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SMTPFLSM™ Fasteners

(1)

  

Min. Tensile 

Rec. Tightening 

Test Sheet Material 

 

Type and 

Strength 

Torque 

.060” P.C. Board

 

Thread Size 

(lbs.) 

(in. lbs.) (4) 

Pull-off (lbs.) (5)

 

SMTPFLSM-440 556 

4.4 

100

 SMTPFLSM-632 

724 

7.0 

105

  

Min. Tensile 

Rec. Tightening 

Test Sheet Material 

 

Type and 

Strength 

Torque 

1.5 mm P.C. Board

 

Thread Size 

(N) 

(N•m) (4) 

Pull-off (N) (5)

 

SMTPFLSM-M3 2900 

0.61 

445

 SMTPFLSM-M3.5 

3269 

0.8 

465

SMTPR™ Retainers

(1)

 

 

Test Sheet Material - .062” Single Layer FR-4

 

Part Number 

Pushout 

Pushout

  

(lbs.) 

(N)

 SMTPR-6-1ET 

161.4 

718

SMTSO™ Reflow Curve

(1)  With lead-free paste. Average values of 30 test points. The data presented here is for general comparison purposes only. Actual performance is dependent upon 

application variables. We will be happy to provide samples for you to install. If required, we can also test your installed hardware and provide you with the performance 
data specific to your application.

(2)  Torque values shown will produce a preload of 70% minimum tensile with a nut factor “k” equal to .1.
(3)  Failure occurred at the solder joint. Screw retention strength is greater than the retainer.

Testing Conditions For Surface Mounted Fasteners
Oven

 

Quad ZCR convection oven w/ 4 zones 

Spokes

  2 Spoke Pattern

High Temp

 

473˚F / 245˚C 

 

Paste

 

Amtech NC559LF Sn96.5/3.0Ag/0.5Cu (SAC305) (SMTSO, SMTRA, SMTPR)

Board Finish

  62% Sn, 38% Pb 

 

 

Alpha CVP-390 Sn96.5/3.0Ag/0.5Cu (SAC305) (SMTPFLSM, SMTSS, SMTSK)

Screen Printer

  Ragin Manual Printer 

 

Stencil

  .0067” / 0.17 mm thick (SMTSO, SMTRA, SMTPR, SMTSS, SMTSK)

Vias

 

None 

 

 

.005” / 0.13 mm thick (SMTPFLSM)

For more information on these and other PEM products, visit our PEMNET™ Resource Center at 

www.pemnet.com

PF11MW™ Floating Captive Panel Screws

(See PEM® Bulletin PF)

Unique flare mount feature allow fasteners to “float” in mounting hole.

•  Compensates for mating thread misalignment.

•  Installs into any panel material.

•  Appropriate for close center-line-to-edge applications.

•  Color coded knobs available.

PF11MF™ Flare-Mounted Captive Panel Screws

(See PEM® Bulletin PF)

•  Appropriate for close centerline-to-edge applications.

•  Doesn’t require high installation force.

•  Installs into any panel material.

•  Installs flush on back side of panel.

•  Color coded knobs available.

SGPC™ Swaging Collar Studs

(See PEM® Bulletin FH)

•  Can be installed into most materials, including stainless steel and rigid non-metallic panels.

•  Can be used to attach dissimilar materials.

•  Can accommodate multiple panels as long as the total thickness does not exceed the

  maximum sheet thickness.

•  Appropriate for close center-line-to-edge applications.

SOAG™/SOSG™ Grounding Standoffs

(See PEM® Bulletin SO)

•  Designed for clinching into steel or aluminum chassis.

•  “Gripping teeth” on opposite side of standoff makes firm electrical contact with mating PC Board.

SKC™ Keyhole® Standoffs

(See PEM® Bulletin SK)

•  Clinch feature mounts fastener permanently into metal sheet.

•  Allows for quick attachment and detachment of PC Board.

•  Head is flush or sub-flush in metal sheet.

•  Makes horizontal or vertical component mounting possible.

SSA™/SSC™/SSS™ Snap-Top® Standoffs

(See PEM® Bulletin SSA)

•  Spring action holds PC Boards and subassemblies securely, while allowing for quick removal.

•  Screws and other threaded hardware are eliminated.

Metal

Metal

Metal

PC Board

plastic or 

metal

PC Board

plastic or 

metal

PC Board

plastic or 

metal

Can install 

into PC 

Board,

plastic

or metal

Other Fasteners For Consideration To Use With PC Boards

Can install 

into PC 

Board,

plastic

or metal

Can install 

into PC 

Board,

plastic

or metal

Fasteners For Use With PC Boards

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Fasteners For Use With PC Boards

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All PEM® products meet our stringent quality standards. If you require additional industry or other specific 

quality certifications

, special procedures and/or part numbers 

are required. Please contact your local sales office or representative for further information. 

Regulatory 

compliance information

 is available in Technical Support section of our website. Specifications subject to change without notice. See our website for the most 

current version of this bulletin.

4/10/24

North America: 

Danboro, Pennsylvania USA 

|

 E-mail: 

info@pemnet.com

 

|

 Tel: +1-215-766-8853 

|

 800-237-4736 (USA)

Europe:

 Galway, Ireland 

|

 E-mail: 

europe@pemnet.com

 

|

 Tel: +353-91-751714

Asia/Pacific: 

Singapore 

|

 E-mail: 

singapore@pemnet.com

 

|

 Tel: +65-6-745-0660

Shanghai, China:

 E-mail: 

china@pemnet.com

 

|

 Tel: +86-21-5868-3688

Visit our PEMNET™ Resource Center at 

www.pemnet.com

 

•

 Technical support e-mail: 

techsupport@pemnet.com

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