SK

™

  

SELF-CLINCHING  

KEYHOLE® FASTENERS

PEM® KEYHOLE® fasteners are 
designed for quick panel attachment 
and reduction of loose hardware.

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Keyhole® Standoffs And Fasteners

SK-2

    

PennEngineering • 

www.pemnet.com

PEM® KEYHOLE® Standoffs and sheet joining fasteners are designed so that a PC board or panel can be quickly slipped into place 

and then removed from an assembly by simply sliding the board sideways and lifting it off. These standoffs and fasteners can save 

valuable time and dramatically reduce the amount of loose hardware required.

SKC™/SK4™/SKCF™/SK4F™/

SKSF™ standoffs

SKC-F™/SK4-F™/SKS-R™/HSKC-R™/

HSK4-R™/HSKS-R™/TSKC-R™/

TSK4-R™/TSKS-R™ fasteners

© 2023 PennEngineering.

Drawings and models 

are available at

www.pemnet.com

PEM® Dimple

(Registered Trademark)

SKC-F™/SK4-F™/SKS-R™/HSKC-R™/HSK4-R™/HSKS-R™/TSKC-R™/TSK4-R™/TSKS-R™ fasteners

 are designed 

so that two sheets can be quickly joined flat against each other. Typically, several fasteners are used with one standard PEM® 

threaded F™ flush nut (

PEM® Bulletin F

) which accepts a screw to secure the sheets against any unwanted movement.

•  Allow detachable spacing of two sheets

•  Clinch feature mounts fastener permanently and flush or sub-flush into metal sheet

•  Unique barrel design allows for quick “panel-on-panel” attachment and detachment

•  Can be clinched into blind hole where concealed head is required

•  Makes horizontal or vertical component mounting possible

•  SK4-R™, HSK4-R™, TSK4-R™, SK4-F™, SK4F-F™ and TSK4F-F™ fasteners are available for 

installation into stainless steel sheets

•  SKS-R™, SKC-R™, SK4-R™, TSKS-R™, HSKS-R™, TSKC-R™, TSK4-R™, HSKC-R™ and  

HSK4-R™ fasteners are designed to provide high side-load in vertical component   

mounting applications and are available for various top sheet thicknesses and hole sizes

SKC™/SK4™/SKCF™/SK4F™/SKSF™ standoffs

 can be used for spacing or mounting of 

replaceable components. Typically, several standoffs are used with one standard PEM® threaded 

standoff which accepts a screw to secure the board or component against any unwanted movement.

•  Allow detachable spacing of two sheets

•  Clinch feature mounts fastener permanently and flush into metal sheet

•  Unique barrel design allows for quick attachment and detachment

•  Makes horizontal or vertical component mounting possible

•  SK4™ and SK4F™ standoffs are available for installation into stainless steel sheets

Fastener drawings and models are available at 

www.pemnet.com.

Custom sizes are available on special order. 

Contact us

 for more information.

SKC-F™/SK4-F™ Fasteners

SKS-R™/HSKC-R™/HSK4-R™/

HSKS-R™/TSKC-R™/TSK4-R™/

TSKS-R™ Fasteners

Custom sizes are available 

on special order. 

Contact us

 

for more information.

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Keyhole® Standoffs And Fasteners

SK-3

   

PennEngineering • 

www.pemnet.com

                  Type   Body   

 

 

 

            Length “L” ± .005

  

  Size -   

 

 

              (Length Code in 32nds of an inch) 

      A  B  C  S  M H

 300 Series  400 Series  Sheet 

               

± .003  ± .003  Max.  ± .003  Max.  Nom.

 Stainless  Stainless  Code  .063 .125  .188  .250  .312  .375  .437 .500 .562 .625  .750 .875  1.00

 Steel  Steel

 SKC 

SK4  6060  2  4 

6 

8 

10  12  14  16  18  20  24  28  32  .099  .177  .212  .068  .108  .250

                   Type   

Body 

 

 

 

         

         

Length “L” ± 0.13

 300 Series  400 Series  Size - 

 

 

 

 

   

(Leng th Code in millimeters)  

 

 

    A  B  C  S M H

  Stainless Stainless 

Sheet 

              

± 

0.08 

± 

0.08 

Max. 

± 

0.08 

Max. 

Nom. 

 

  Steel (1) Steel 

(2) Code

 SKC 

SK4  61.5  2  4 

6 

8 

10  12 

14  16 

18  20  22  25  2.51  4.5  5.39  1.73  2.75  6.35

All dimensions are in inches.

All dimensions are in millimeters.

SK  C  – 6  060 – 12

SK  4  – 6  060 – 12

Type

Body

Size

Code

Length

Code

 Material

Code

Sheet

Thickness

Code

SKC™/SK4™ Standoff Dimensional Data

H

L

C

B

A

S

M

PEM “dimple” 

registered

trademark.

Clinching profile may vary.

All dimensions are in inches.

Type

Body Size 

Sheet 

Code

Length “L” ±.005

(Length Code in 32nds of an inch)

A

±.003

B

±.003

C

Max.

S

±.003

M

Max.

H

Nom.

300 Series Stain-

less Steel

400 Series 

Stainless Steel

Hardened

Steel

.125

.188

.250

.312

.375

SKCF

SK4F

SKSF

6060

4

6

8

10

12

.099

.177

.212

.068

.108

.250

Type

Body Size 

Sheet 

Code

Length “L” ±0.13

(Length Code in millimeters)

A

±0.08

B

±0.08

C

Max.

S

±0.08

M

Max.

H

Nom.

300 Series Stain-

less Steel

400 Series 

Stainless Steel

Hardened

Steel

SKCF

SK4F

SKSF

61.5

4

6

8

10

2.51

4.5

5.39

1.73

2.75

6.35

All dimensions are in millimeters.

SK  C 

F  -  6  060 -  8

SK  4 

F  -  6  060 -  8

SK  S 

F  -  6  060 -  8  ZI

Type

Part Number Designation 

 Material

Code

Body Size

Code

Length 

Code

 Sheet 

Thickness 

Code

Finish

Manu-

facturing 

Code

SKCF™/SK4F™/SKSF™ Standoff Dimensional Data

H

L

C

B

A

S

M

PEM “dimple” 

registered

trademark.

Clinching profile may vary.

Part Number Designation 

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Keyhole® Standoffs And Fasteners

SK-4

    

PennEngineering • 

www.pemnet.com

                          Type

  

 

Face 

Top Sheet 

A 

B 

C 

H 

M 

N 

S

  300 Series 

400 Series 

Mounting 

Thickness 

Max. 

± .003 

Max. 

Nom. 

Max. 

± .003 

±.003

 Stainless 

Stainless  Designation Code

 Steel 

Steel 

Code

 SKC 

SK4 

F 

1.5 

.039 

.177 

.212 

.237 

.108 

.099 

.068

                          Type

  

 

Face 

Top Sheet 

A 

B 

C 

H 

M 

N 

S

  300 Series 

400 Series 

Mounting 

Thickness 

Max. 

± 0.08 

Max. 

Nom. 

Max. 

± 0.08 

±0.08

 Stainless  Stainless 

Designation Code

 Steel 

Steel 

Code

 SKC 

SK4 

F 

1.5 

1 

4.5 

5.39 

6.02 

2.75 

2.5 

1.73

All dimensions are in inches.

All dimensions are in millimeters.

SKC-F™/SK4-F™ Fastener Dimensional Data

SK  C  – F 

1.5

SK  4  – F 

1.5

Type

Face 

Mounting

Designation

Code

Part Number Designation 

 Material

Code

Sheet

Thickness

Code

H

N

C

B

A

S

M

PEM “dimple” 

registered

trademark.

Clinching profile may vary.

 Type

  

 

 

Face 

Top Sheet 

A 

B 

C 

H 

M 

N 

S

  300 Series  400 Series 

 

Mounting 

Thickness 

Max. 

± .003 

Max. 

Nom. 

Max. 

± .003 

±.003

 Stainless  Stainless 

Hardened 

Designation Code

 Steel 

Steel 

Steel 

Code

 SKCF 

SK4F 

SKSF 

F 

1.5 

.039 

.177 

.212 

.237 

.108 

.099 

.068

 TSKCF 

TSK4F 

TSKSF 

F 

1.5 

.032 

.177 

.212 

.237 

.108 

.099 

.068

 Type

  

 

 

Face 

Top Sheet 

A 

B 

C 

H 

M 

N 

S

  300 Series  400 Series 

 

Mounting 

Thickness 

Max. 

± 0.08 

Max. 

Nom. 

Max. 

± 0.08 

±0.08

 Stainless  Stainless  Hardened 

Designation Code

 Steel 

Steel 

Steel 

Code

 SKCF 

SK4F 

SKSF 

F 

1.5 

1 

4.5 

5.39 

6.02 

2.75 

2.5 

1.73

 TSKCF  TSK4F 

TSKSF 

F 

1.5 

0.8 

4.5 

5.39 

6.02 

2.75 

2.5 

1.73

All dimensions are in inches.

All dimensions are in millimeters.

SKCF-F™/SK4F-F™/SKSF-F™/ TSKCF-F™/TSK4-F™/TSKSF-F™ 

Fastener Dimensional Data

Part Number Designation 

SK  C 

F  – F 

1.5

SK  4 

F  – F 

1.5

SK  S 

F  –  F 

1.5  - ZI

TSK C 

F  –  F 

1.5

TSK 4 

F  –  F 

1.5

TSK  S 

F  –  F 

1.5  - ZI

Type

Face

Mounting

Designation

Code

 Material

Code

Sheet

Thickness

Code

 Manufacturing

Code

Finish

TSK for .032” / 0.8mm thick panels

H

N

C

B

A

S

M

PEM “dimple” 

registered

trademark.

Clinching profile may vary.

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Keyhole® Standoffs And Fasteners

SK-5

   

PennEngineering • 

www.pemnet.com

 

Type 

Face Mounting 

Top Sheet 

Neck 

A 

B C  H  M N 

S  

 Hardened 

Designation 

Thickness 

Diameter 

(Shank) 

±.003 Max.  Nom.  Max. ±.003 +.003

 

Steel Code  Code 

Code 

Max.        -.008

  

 

 

2.5 

 

.177 

.212 

.236 

 

.099

 

SKS R 

1.5  3.2 .039 .217 .235 .276  .148 .126  .107

  

 

 

4.0 

 

.256  .275 

.307 

 

.157

  

 

 

2.5 

 

.177 

.212 

.236 

 

.099

 

SKS R 

2.0  3.2 .039 .217 .235 .276  .167 .126  .127

  

 

 

4.0 

 

.256  .275 

.307 

 

.157

  

 

 

2.5 

 

.177 

.212 

.236 

 

.099

 

SKS R 

2.5  3.2 .039 .217 .235 .276  .187  .126  .147

  

 

 

4.0 

 

.256  .275 

.307 

 

.157

All dimensions are in inches.

SKS-R™, SKC-R™ AND SK4-R™ Fastener Dimensional Data

All dimensions are in millimeters.

H

N

C

B

A

S

M

PEM “dimple” 

registered

trademark.

Clinching profile may vary.

SK  S  –  R 

1.5  – 2.5  – ZI

SK  C  –  R 

1.5  – 2.5

SK  4  –  R 

1.5  – 2.5

Type

Face

Mounting

Designation

Code

Part Number Designation 

 Material

Code

Top Sheet

Thickness

Code

Finish

Neck

Diameter

Code

 

Type 

Face Mounting 

Top Sheet 

Neck 

A 

B  C  H M 

N 

S  

 Hardened 

Designation 

Thickness 

Diameter 

(Shank) 

±0.08  Max.  Nom. Max. 

±0.08 +0.08

 Steel 

Code 

Code 

Code 

Max. 

 

 

 

 

 

-0.21

  

 

 

2.5 

 

4.5 

5.39 

6 

 

2.5

 

SKS R 

1.5  3.2 1 5.5  5.98  7 3.75  3.2 

2.73

  

 

 

4.0 

 

6.5 

6.98 

7.8 

 

4

  

 

 

2.5 

 

4.5 

5.39 

6 

 

2.5

 

SKS R 

2.0  3.2 1 5.5  5.98  7 4.25  3.2 

3.23

  

 

 

4.0 

 

6.5 

6.98 

7.8 

 

4

  

 

 

2.5 

 

4.5 

5.39 

6 

 

2.5

 

SKS R 

2.5  3.2 1 5.5  5.98  7 4.75  3.2 

3.73

  

 

 

4.0 

 

6.5 

6.98 

7.8 

 

4

All dimensions are in millimeters.

                                 Type 

 

Face Mounting 

Top Sheet 

Neck 

A 

B  C  H M N S  

 

300 Series 

400 Series 

Designation 

Thickness 

Diameter 

(Shank) 

±0.08  Max.  Nom.  Max.  ±0.08 ±0.08

  Stainless Steel 

Stainless Steel 

Code 

Code 

Code 

Max. 

 

 

 

 

  2.5  4.5 6  7   2.5

 

SKC  SK4 R  1.5  3.2 1 5.5  7  8  3.75 3.2 2.73

  

 

 

 

4.0    6.5  8  9    4

 

 

 

 

  2.5  4.5 6  7   2.5

 

SKC  SK4 R  2.0  3.2 1 5.5  7  8  4.25 3.2 3.23

  

 

 

 

4.0    6.5  8  9    4

 

 

 

 

  2.5  4.5 6  7   2.5

 

SKC  SK4 R  2.5  3.2 1 5.5  7  8  4.75 3.2 3.73

  

 

 

 

4.0    6.5  8  9    4

All dimensions are in inches.

                                 Type 

 

Face Mounting 

Top Sheet 

Neck 

A 

B  C  H M N S  

 

300 Series 

400 Series 

Designation 

Thickness 

Diameter 

(Shank) 

±.003  Max.  Nom.  Max.  ±.003 ±.003

  Stainless Steel 

Stainless Steel 

Code 

Code 

Code 

Max. 

  

 

 

 

2.5    .177  .236  .276    .099

 

SKC  SK4 R 

1.5  3.2 .039 .217 .276 .315 .148 .126 .107

  

 

 

 

4.0    .256  .315  .354    .157

  

 

 

 

2.5    .177  .236  .276    .099

 

SKC  SK4 R 

2.0  3.2 .039 .217 .276 .315 .167 .126 .127

  

 

 

 

4.0    .256  .315  .354    .157

  

 

 

 

2.5    .177  .236  .276    .099

 

SKC  SK4 R 

2.5  3.2 .039 .217 .276 .315 .187 .126 .147

  

 

 

 

4.0    .256  .315  .354    .157

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Keyhole® Standoffs And Fasteners

SK-6

    

PennEngineering • 

www.pemnet.com

TSKS-R™, TSKC-R™, TSK4-R™, HSKS-R™, HSKC-R™ AND HSK4-R™ 

Fastener Dimensional Data

H

N

C

B

A

S

M

PEM “dimple” 

registered

trademark.

Clinching profile may vary.

TSK  C  –  R 

1.5  – 2.5

TSK  4  –  R 

1.5  – 2.5

TSK  S  –  R 

1.5  – 2.5  – ZI

HSK  C  –  R 

1.5  – 2.5

HSK  4  –  R 

1.5  – 2.5

HSK  S  –  R 

1.5  – 2.5  – ZI

Type

Face

Mounting

Designation

Code

Part Number Designation

 Material

Code

Top Sheet

Thickness

Code

Finish

Neck

Diameter

Code

All dimensions are in millimeters.

All dimensions are in inches.

TSK for .032” / 0.8mm thick panels

HSK for .047” / 1.2mm thick panels

All dimensions are in millimeters.

All dimensions are in inches.

Type

Face Mounting 

Designation 

Code

Top Sheet 

Thickness 

Code

Neck 

Diameter 

Code

A

(Shank) 

Max.

B

±0.08

C

Max.

H

Nom.

M

Max.

N

±0.08

S

±0.08

Hardened 

Steel

300 Series 

Stainless Steel

400 Series 

Stainless Steel

TSKS

TSKC

TSK4

R

1.5

2.5

0.8

4.5

6

7

3.55

2.5

2.53

TSKS

TSKC

TSK4

R

2.0

2.5

0.8

4.5

6

7

4.05

2.5

3.03

TSKS

TSKC

TSK4

R

2.5

2.5

0.8

4.5

6

7

4.55

2.5

3.53

Type

Face Mounting 

Designation 

Code

Top Sheet 

Thickness 

Code

Neck 

Diameter 

Code

A

(Shank) 

Max.

B

±.003

C

Max.

H

Nom.

M

Max.

N

±.003

S

±.003

Hardened 

Steel

300 Series 

Stainless Steel

400 Series 

Stainless Steel

TSKS

TSKC

TSK4

R

1.5

2.5

.032

.177

.236

.276

.140

.099

.100

TSKS

TSKC

TSK4

R

2.0

2.5

.032

.177

.236

.276

.159

.099

.119

TSKS

TSKC

TSK4

R

2.5

2.5

.032

.177

.236

.276

.179

.099

.139

Type

Face Mounting 

Designation 

Code

Top Sheet 

Thickness 

Code

Neck 

Diameter 

Code

A

(Shank) 

Max.

B

±.003

C

Max.

H

Nom.

M

Max.

N

±.003

S

±.003

Hardened 

Steel

300 Series 

Stainless Steel

400 Series 

Stainless Steel

HSKS

HSKC

HSK4

R

1.5

2.5

.047

.177

.236

.276

.156

.099

.115

3.2

.217

.276

.315

.126

4.0

.256

.315

.354

.157

HSKS

HSKC

HSK4

R

2.0

2.5

.047

.177

.236

.276

.175

.099

.135

3.2

.217

.276

.315

.126

4.0

.256

.315

.354

.157

HSKS

HSKC

HSK4

R

2.5

2.5

.047

.177

.236

.276

.198

.099

.155

3.2

.217

.276

.315

.126

4.0

.256

.315

.354

.157

Type

Face Mounting 

Designation 

Code

Top Sheet 

Thickness 

Code

Neck 

Diameter 

Code

A

(Shank) 

Max.

B

±0.08

C

Max.

H

Nom.

M

Max.

N

±0.08

S

±0.08

Hardened 

Steel

300 Series 

Stainless Steel

400 Series 

Stainless Steel

HSKS

HSKC

HSK4

R

1.5

2.5

1.2

4.5

6

7

3.95

2.5

2.93

3.2

5.5

7

8

3.2

4.0

6.5

8

9

4

HSKS

HSKC

HSK4

R

2.0

2.5

1.2

4.5

6

7

4.45

2.5

3.43

3.2

5.5

7

8

3.2

4.0

6.5

8

9

4

HSKS

HSKC

HSK4

R

2.5

2.5

1.2

4.5

6

7

4.95

2.5

3.93

3.2

5.5

7

8

3.2

4.0

6.5

8

9

4

HSKS

—

—

R

1.2

4.0

1.2

7

8

9.5

3.9

4

2.6

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Keyhole® Standoffs And Fasteners

SK-7

   

PennEngineering • 

www.pemnet.com

All dimensions are in inches.

SKC™/SK4™/ SKCF™/SK4F™/SKSF™ Standoffs

A

1

 Rad.

A

3

 Dia.

Mounting Hole A in Panel 2

Location

Tolerance

±.005” / ±0.13 mm

A

2

A

4

Application Data

Panel 1

Panel 2

Type

Bottom

Mounting Hole B

+.003 –.000

Sheet

Hardness

Max. 

(1)

Min. Sheet 

Thickness

Edge

Distance

C1 Min. 

(4)

Top Mounting Hole A

Material

Thickness 

Range

Edge 

Distance 

C2 Min. 

(4)

A1

Nom.

A2

±.003

A3

±.003

A4

Min.

SKC-6060

.213

HRB 70 / HB 125

.040

.260

.059

.118

.197

.148

ANY

.057 - .064

.160

SK4-6060

.213

HRB 88 / HB 183

.040

.260

.059

.118

.197

.148

ANY

.057 - .064

.160

SKCF-6060

.213

HRB 70 / HB 125

.040

.260

.059

.118

.197

.148

ANY

.057 - .064

.160

SK4F-6060

.213

HRB 88 / HB 183

.040

.260

.059

.118

.197

.148

ANY

.057 - .064

.160

SKSF-6060

.213

HRB 80 / HB 150

.040

.260

.059

.118

.197

.148

ANY

.057 - .064

.160

SKC-F1.5

.213

HRB 70 / HB 125

.040 

(2)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

SK4-F1.5

.213

HRB 88 / HB 183

.040 

(2)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

SKCF-F1.5

.213

HRB 70 / HB 125

.040 

(2)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

SK4F-F1.5

.213

HRB 88 / HB 183

.040 

(2)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

SKSF-F1.5

.213

HRB 80 / HB 150

.040 

(2)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

TSKCF-F1.5

.213

HRB 70 / HB 125

.032 

(3)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

TSK4F-F1.5

.213

HRB 88 / HB 183

.032 

(3)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

TSKSF-F1.5

.213

HRB 80 / HB 150

.032 

(3)

.150

.059

.118

.197

.148

ANY

.057 - .064

.160

Panel 1

Panel 2

Type

Bottom

Mounting Hole B

+0.08

Sheet

Hardness

Max. 

(1)

Min. Sheet 

Thickness

Edge

Distance

C1 Min. 

(4)

Top Mounting Hole A

Material

Thickness 

Range

Edge 

Distance 

C2 Min. 

(4)

A1

Nom.

A2

±0.08

A3

±0.08

A4

Min.

SKC-61.5

5.41

HRB 70 / HB 125

1

6.6

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SK4-61.5

5.41

HRB 88 / HB 183

1

6.6

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SKCF-61.5

5.41

HRB 70 / HB 125

1

6.6

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SK4F-61.5

5.41

HRB 88 / HB 183

1

6.6

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SKSF-61.5

5.41

HRB 80 / HB 150

1

6.6

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SKC-F1.5

5.41

HRB 70 / HB 125

1 

(2)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SK4-F1.5

5.41

HRB 88 / HB 183

1 

(2)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SKCF-F1.5

5.41

HRB 70 / HB 125

1 

(2)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SK4F-F1.5

5.41

HRB 88 / HB 183

1 

(2)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

SKSF-F1.5

5.41

HRB 80 / HB 150

1 

(2)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

TSKCF-F1.5

5.41

HRB 70 / HB 125

0.8 

(3)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

TSK4F-F1.5

5.41

HRB 88 / HB 183

0.8 

(3)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

TSKSF-F1.5

5.41

HRB 80 / HB 150

0.8 

(3)

3.8

1.5

3

5

3.75

ANY

1.45 - 1.62

4.1

All dimensions are in millimeters.

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

(2) SKC-F™/SK4-F™/ SKCF-F™/SK4F-F™/SKSF-F™ fasteners may also be installed into a .043”/1.1mm minimum depth blind milled hole in a .062”/1.6mm minimum sheet thickness.

(3) TSKCF-F™/TSK4F-F™/TSKSF-F™ fasteners may also be installed into a .035”/0.9mm minimum depth blind milled hole in a .055”/1.4mm minimum sheet thickness.

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

PEM® Tech Sheet C/L To Edge

.

SKC-F™/SK4-F™/ SKCF-F™/SK4-F™/SKSF-F™/ 

TSKCF-F™/TSK4-F™/TSKSF-F™ Fasteners

Edge

C

2

Edge

C

1

PANEL 2

PANEL 1

Mounting Hole B

Mounting Hole A

Mounting

Hole Location

Tolerance

±.005” / ±0.13 mm

A

1

 Rad.

A

3

 Dia.

Mounting Hole A in Panel 2

Location

Tolerance

±.005” / ±0.13 mm

A

2

A

4

Edge

C

2

Edge

C

1

Mounting Hole B

Mounting Hole A

PANEL 2

PANEL 1

Mounting Hole

Location Tolerance

±.005” / ±0.13 mm

Uni

fie

d

Keyhole® Standoffs And Fasteners

SK-8

    

PennEngineering • 

www.pemnet.com

All dimensions are in inches.

 

 

Bottom Mounting 

 

 

Edge 

                        Top Mounting Hole A 

 

 

 

Edge

 

Type 

Hole B 

Sheet Hardness  Thickness Distance  A

1

 A

2

 A

3

 A

4

 

  Thickness Distance

 

 

+ .003 –.000 

Max. (1) 

Range 

C

1

 Min. (2) 

Nom. 

± .003 

± .003 

Min. 

Material 

Max. 

C

2

 Min. (2)

  SKS-R1.5-2.5-ZI 

.213 

HRB 80 / HB 150 

.040 - .047 

.236 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

  SKS-R1.5-3.2-ZI 

.236 

HRB 80  / HB 150 

.040 - .047 

.236 

.073 

.146 

.236 

.181 

ANY 

.060 

.201

  SKS-R1.5-4.0-ZI 

.276 

HRB 80 / HB 150 

.040 - .047 

.236 

.089 

.177 

.276 

.217 

ANY 

.060 

.240

  SKS-R2.0-2.5-ZI 

.213 

HRB 80 / HB 150 

.040 - .047 

.236 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  SKS-R2.0-3.2-ZI 

.236 

HRB 80  / HB 150 

.040 - .047 

.236 

.073 

.146 

.236 

.181 

ANY 

.080 

.201

  SKS-R2.0-4.0-ZI 

.276 

HRB 80 / HB 150 

.040 - .047 

.236 

.089 

.177 

.276 

.217 

ANY 

.080 

.240

  SKS-R2.5-2.5-ZI 

.213 

HRB 80 / HB 150 

.040 - .047 

.236 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  SKS-R2.5-3.2-ZI 

.236 

HRB 80  / HB 150 

.040 - .047 

.236 

.073 

.146 

.236 

.181 

ANY 

.100 

.201

  SKS-R2.5-4.0-ZI 

.276 

HRB 80 / HB 150 

.040 - .047 

.236 

.089 

.177 

.276 

.217 

ANY 

.100 

.240

 

SKC-R1.5-2.5 

.237 

HRB 70 / HB 125 

.040 - .047 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

 

SKC-R1.5-3.2 

.277 

HRB 70  / HB 125 

.040 - .047 

.295 

.073 

.146 

.236 

.181 

ANY 

.060 

.201

 

SKC-R1.5-4.0 

.316 

HRB 70 / HB 125 

.040 - .047 

.315 

.089 

.177 

.276 

.217 

ANY 

.060 

.240

  SKC-R2.0-2.5 

.237 

HRB 70 / HB 125 

.040 - .047 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  SKC-R2.0-3.2 

.277 

HRB 70  / HB 125 

.040 - .047 

.295 

.073 

.146 

.236 

.181 

ANY 

.080 

.201

  SKC-R2.0-4.0 

.316 

HRB 70 / HB 125 

.040 - .047 

.315 

.089 

.177 

.276 

.217 

ANY 

.080 

.240

  SKC-R2.5-2.5 

.237 

HRB 70 / HB 125 

.040 - .047 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  SKC-R2.5-3.2 

.277 

HRB 70  / HB 125 

.040 - .047 

.295 

.073 

.146 

.236 

.181 

ANY 

.100 

.201

  SKC-R2.5-4.0 

.316 

HRB 70 / HB 125 

.040 - .047 

.315 

.089 

.177 

.276 

.217 

ANY 

.100 

.240

 

SK4-R1.5-2.5 

.237 

HRB 88 / HB 183 

.040 - .047 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

 

SK4-R1.5-3.2 

.277 

HRB 88 / HB 183 

.040 - .047 

.295 

.073 

.146 

.236 

.181 

ANY 

.060 

.201

 

SK4-R1.5-4.0 

.316 

HRB 88 / HB 183 

.040 - .047 

.315 

.089 

.177 

.276 

.217 

ANY 

.060 

.240

  SK4-R2.0-2.5 

.237 

HRB 88 / HB 183 

.040 - .047 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  SK4-R2.0-3.2 

.277 

HRB 88 / HB 183 

.040 - .047 

.295 

.073 

.146 

.236 

.181 

ANY 

.080 

.201

  SK4-R2.0-4.0 

.316 

HRB 88 / HB 183 

.040 - .047 

.315 

.089 

.177 

.276 

.217 

ANY 

.080 

.240

  SK4-R2.5-2.5 

.237 

HRB 88 / HB 183 

.040 - .047 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  SK4-R2.5-3.2 

.277 

HRB 88 / HB 183 

.040 - .047 

.295 

.073 

.146 

.236 

.181 

ANY 

.100 

.201

  SK4-R2.5-4.0 

.316 

HRB 88 / HB 183 

.040 - .047 

.315 

.089 

.177 

.276 

.217 

ANY 

.100 

.240

  TSKS-R1.5-2.5-ZI 

.237 

HRB 80 / HB 150 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

  TSKS-R2.0-2.5-ZI 

.237 

HRB 80 / HB 150 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  TSKS-R2.5-2.5-ZI 

.237 

HRB 80 / HB 150 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  HSKS-R1.5-2.5-ZI 

.237 

HRB 80 / HB 150 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

  HSKS-R1.5-3.2-ZI 

.277 

HRB 80 / HB 150 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.060 

.201

  HSKS-R1.5-4.0-ZI 

.316 

HRB 80 / HB 150 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.060 

.240

  HSKS-R2.0-2.5-ZI 

.237 

HRB 80 / HB 150 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  HSKS-R2.0-3.2-ZI 

.277 

HRB 80 / HB 150 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.080 

.201

  HSKS-R2.0-4.0-ZI 

.316 

HRB 80 / HB 150 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.080 

.240

  HSKS-R2.5-2.5-ZI 

.237 

HRB 80 / HB 150 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  HSKS-R2.5-3.2-ZI 

.277 

HRB 80 / HB 150 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.100 

.201

  HSKS-R2.5-4.0-ZI 

.316 

HRB 80 / HB 150 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.100 

.240

  TSKC-R1.5-2.5 

.237 

HRB 70 / HB 125 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

  TSKC-R2.0-2.5 

.237 

HRB 70 / HB 125 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  TSKC-R2.5-2.5 

.237 

HRB 70 / HB 125 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  HSKC-R1.5-2.5 

.237 

HRB 70 / HB 125 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

  HSKC-R1.5-3.2 

.277 

HRB 70 / HB 125 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.060 

.201

  HSKC-R1.5-4.0 

.316 

HRB 70 / HB 125 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.060 

.240

  HSKC-R2.0-2.5 

.237 

HRB 70 / HB 125 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  HSKC-R2.0-3.2 

.277 

HRB 70 / HB 125 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.080 

.201

  HSKC-R2.0-4.0 

.316 

HRB 70 / HB 125 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.080 

.240

  HSKC-R2.5-2.5 

.237 

HRB 70 / HB 125 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  HSKC-R2.5-3.2 

.277 

HRB 70 / HB 125 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.100 

.201

  HSKC-R2.5-4.0 

.316 

HRB 70 / HB 125 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.100 

.240

  TSK4-R1.5-2.5 

.237 

HRB 88 / HB 183 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

  TSK4-R2.0-2.5 

.237 

HRB 88 / HB 183 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  TSK4-R2.5-2.5 

.237 

HRB 88 / HB 183 

.032 - .038 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  HSK4-R1.5-2.5 

.237 

HRB 88 / HB 183 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.060 

.160

  HSK4-R1.5-3.2 

.277 

HRB 88 / HB 183 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.060 

.201

  HSK4-R1.5-4.0 

.316 

HRB 88 / HB 183 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.060 

.240

  HSK4-R2.0-2.5 

.237 

HRB 88 / HB 183 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.080 

.160

  HSK4-R2.0-3.2 

.277 

HRB 88 / HB 183 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.080 

.201

  HSK4-R2.0-4.0 

.316 

HRB 88 / HB 183 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.080 

.240

  HSK4-R2.5-2.5 

.237 

HRB 88 / HB 183 

.047 - .055 

.276 

.059 

.118 

.197 

.148 

ANY 

.100 

.160

  HSK4-R2.5-3.2 

.277 

HRB 88 / HB 183 

.047 - .055 

.295 

.073 

.146 

.236 

.181 

ANY 

.100 

.201

  HSK4-R2.5-4.0 

.316 

HRB 88 / HB 183 

.047 - .055 

.315 

.089 

.177 

.276 

.217 

ANY 

.100 

.240

PANEL 1

PANEL 2

Application Data — SKS-R™/SKC-R™/SK4-R™/ TSKS-R™/HSKS-R™/

TSKC-R™/TSK4-R™/HSKC-R™/HSK4-R™ Fasteners

Mounting Hole A in Panel 2

A

1

 Rad.

A

3

 Dia.

Location

Tolerance

±.005” / ±0.13 mm

A

2

A

4

Edge

C

2

Edge

C

1

PANEL 2

PANEL 1

Mounting 

Hole B

Mounting 

Hole A

Mounting

Hole Location

Tolerance

±.005” / ±0.13 mm

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

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

PEM® Tech Sheet C/L To Edge

.

Me

tric

Keyhole® Standoffs And Fasteners

SK-9

   

PennEngineering • 

www.pemnet.com

All dimensions are in millimeterrs.

 

 

Bottom Mounting 

 

 

Edge 

                        Top Mounting Hole A 

 

 

 

Edge

 

Type 

Hole B 

Sheet Hardness  Thickness Distance  A

1

 A

2

 A

3

 A

4

 

  Thickness Distance

 

 

+ 0.08 

Max. (1) 

Range 

C

1

 Min. (2) 

Nom. 

±0.08 

± 0.08 

Min. 

Material 

Max. 

C

2

 Min. (2)

  SKS-R1.5-2.5-ZI 

5.41 

HRB 80 / HB 150 

1-1.19 

6 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

  SKS-R1.5-3.2-ZI 

6 

HRB 80 / HB 150 

1-1.19 

6 

1.85 

3.7 

6 

4.6 

ANY 

1.54 

5.1

  SKS-R1.5-4.0-ZI 

7 

HRB 80 / HB 150 

1-1.19 

6 

2.25 

4.5 

7 

5.5 

ANY 

1.54 

6.1

  SKS-R2.0-2.5-ZI 

5.41 

HRB 80 / HB 150 

1-1.19 

6 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  SKS-R2.0-3.2-ZI 

6 

HRB 80 / HB 150 

1-1.19 

6 

1.85 

3.7 

6 

4.6 

ANY 

2.04 

5.1

  SKS-R2.0-4.0-ZI 

7 

HRB 80 / HB 150 

1-1.19 

6 

2.25 

4.5 

7 

5.5 

ANY 

2.04 

6.1

  SKS-R2.5-2.5-ZI 

5.41 

HRB 80 / HB 150 

1-1.19 

6 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  SKS-R2.5-3.2-ZI 

6 

HRB 80 / HB 150 

1-1.19 

6 

1.85 

3.7 

6 

4.6 

ANY 

2.54 

5.1

  SKS-R2.5-4.0-ZI 

7 

HRB 80 / HB 150 

1-1.19 

6 

2.25 

4.5 

7 

5.5 

ANY 

2.54 

6.1

 

SKC-R1.5-2.5 

6.02 

HRB 70 / HB 125 

1-1.19 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

 

SKC-R1.5-3.2 

7.02 

HRB 70 / HB 125 

1-1.19 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

1.54 

5.1

 

SKC-R1.5-4.0 

8.02 

HRB 70 / HB 125 

1-1.19 

8 

2.25 

4.5 

7 

5.5 

ANY 

1.54 

6.1

  SKC-R2.0-2.5 

6.02 

HRB 70 / HB 125 

1-1.19 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  SKC-R2.0-3.2 

7.02 

HRB 70 / HB 125 

1-1.19 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.04 

5.1

  SKC-R2.0-4.0 

8.02 

HRB 70 / HB 125 

1-1.19 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.04 

6.1

  SKC-R2.5-2.5 

6.02 

HRB 70 / HB 125 

1-1.19 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  SKC-R2.5-3.2 

7.02 

HRB 70 / HB 125 

1-1.19 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.54 

5.1

  SKC-R2.5-4.0 

8.02 

HRB 70 / HB 125 

1-1.19 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.54 

6.1

 

SK4-R1.5-2.5 

6.02 

HRB 88 / HB 183 

1-1.19 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

 

SK4-R1.5-3.2 

7.02 

HRB 88 / HB 183 

1-1.19 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

1.54 

5.1

 

SK4-R1.5-4.0 

8.02 

HRB 88 / HB 183 

1-1.19 

8 

2.25 

4.5 

7 

5.5 

ANY 

1.54 

6.1

  SK4-R2.0-2.5 

6.02 

HRB 88 / HB 183 

1-1.19 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  SK4-R2.0-3.2 

7.02 

HRB 88 / HB 183 

1-1.19 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.04 

5.1

  SK4-R2.0-4.0 

8.02 

HRB 88 / HB 183 

1-1.19 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.04 

6.1

  SK4-R2.5-2.5 

6.02 

HRB 88 / HB 183 

1-1.19 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  SK4-R2.5-3.2 

7.02 

HRB 88 / HB 183 

1-1.19 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.54 

5.1

  SK4-R2.5-4.0 

8.02 

HRB 88 / HB 183 

1-1.19 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.54 

6.1

  TSKS-R1.5-2.5-ZI 

6.02 

HRB 80 / HB 150 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

  TSKS-R2.0-2.5-ZI 

6.02 

HRB 80 / HB 150 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  TSKS-R2.5-2.5-ZI 

6.02 

HRB 80 / HB 150 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  HSKS-R1.5-2.5-ZI 

6.02 

HRB 80 / HB 150 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

  HSKS-R1.5-3.2-ZI 

7.02 

HRB 80 / HB 150 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

1.54 

5.1

  HSKS-R1.5-4.0-ZI 

8.02 

HRB 80 / HB 150 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

1.54 

6.1

  HSKS-R2.0-2.5-ZI 

6.02 

HRB 80 / HB 150 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  HSKS-R2.0-3.2-ZI 

7.02 

HRB 80 / HB 150 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.04 

5.1

  HSKS-R2.0-4.0-ZI 

8.02 

HRB 80 / HB 150 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.04 

6.1

  HSKS-R2.5-2.5-ZI 

6.02 

HRB 80 / HB 150 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  HSKS-R2.5-3.2-ZI 

7.02 

HRB 80 / HB 150 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.54 

5.1

  HSKS-R2.5-4.0-ZI 

8.02 

HRB 80 / HB 150 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.54 

6.1

  HSKS-R1.2-4.0-ZI 

8.02 

HRB 80 / HB 150 

1.2-1.39 

8 

2.25 

4.5 

7.5 

5.75 

ANY 

1.21 

6.6

  TSKC-R1.5-2.5 

6.02 

HRB 70 / HB 125 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

  TSKC-R2.0-2.5 

6.02 

HRB 70 / HB 125 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  TSKC-R2.5-2.5 

6.02 

HRB 70 / HB 125 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  HSKC-R1.5-2.5 

6.02 

HRB 70 / HB 125 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

  HSKC-R1.5-3.2 

7.02 

HRB 70 / HB 125 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

1.54 

5.1

  HSKC-R1.5-4.0 

8.02 

HRB 70 / HB 125 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

1.54 

6.1

  HSKC-R2.0-2.5 

6.02 

HRB 70 / HB 125 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  HSKC-R2.0-3.2 

7.02 

HRB 70 / HB 125 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.04 

5.1

  HSKC-R2.0-4.0 

8.02 

HRB 70 / HB 125 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.04 

6.1

  HSKC-R2.5-2.5 

6.02 

HRB 70 / HB 125 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  HSKC-R2.5-3.2 

7.02 

HRB 70 / HB 125 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.54 

5.1

  HSKC-R2.5-4.0 

8.02 

HRB 70 / HB 125 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.54 

6.1

  TSK4-R1.5-2.5 

6.02 

HRB 88 / HB 183 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

  TSK4-R2.0-2.5 

6.02 

HRB 88 / HB 183 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  TSK4-R2.5-2.5 

6.02 

HRB 88 / HB 183 

0.8-0.95 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  HSK4-R1.5-2.5 

6.02 

HRB 88 / HB 183 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

1.54 

4.1

  HSK4-R1.5-3.2 

7.02 

HRB 88 / HB 183 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

1.54 

5.1

  HSK4-R1.5-4.0 

8.02 

HRB 88 / HB 183 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

1.54 

6.1

  HSK4-R2.0-2.5 

6.02 

HRB 88 / HB 183 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

2.04 

4.1

  HSK4-R2.0-3.2 

7.02 

HRB 88 / HB 183 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.04 

5.1

  HSK4-R2.0-4.0 

8.02 

HRB 88 / HB 183 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.04 

6.1

  HSK4-R2.5-2.5 

6.02 

HRB 88 / HB 183 

1.2-1.39 

7 

1.5 

3 

5 

3.75 

ANY 

2.54 

4.1

  HSK4-R2.5-3.2 

7.02 

HRB 88 / HB 183 

1.2-1.39 

7.5 

1.85 

3.7 

6 

4.6 

ANY 

2.54 

5.1

  HSK4-R2.5-4.0 

8.02 

HRB 88 / HB 183 

1.2-1.39 

8 

2.25 

4.5 

7 

5.5 

ANY 

2.54 

6.1

PANEL 1

PANEL 2

Application Data — SKS-R™/SKC-R™/SK4-R™/ TSKS-R™/HSKS-R™/

TSKC-R™/TSK4-R™/HSKC-R™/HSK4-R™ Fasteners

Mounting Hole A in Panel 2

A

1

 Rad.

A

3

 Dia.

Location

Tolerance

±.005” / ±0.13 mm

A

2

A

4

Edge

C

2

Edge

C

1

PANEL 2

PANEL 1

Mounting 

Hole B

Mounting 

Hole A

Mounting

Hole Location

Tolerance

±.005” / ±0.13 mm

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

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

PEM® Tech Sheet C/L To Edge

.

Keyhole® Standoffs And Fasteners

SK-10

    

PennEngineering • 

www.pemnet.com

A Note About 400 Series Fasteners For Stainless Steel Panels

In order for self-clinching fasteners to work properly, the fastener must be harder than the sheet into which 

it is being installed.  In the case of stainless steel panels, fasteners made from 300 Series Stainless Steel do 

not meet this hardness criteria.  It is for this reason that 400 series fasteners (SK4 and SK4-F) are offered.  

However, while these 400 Series fasteners install and perform well in 300 Series stainless sheets they should 

not be used if the end product:
 

•  Will be exposed to any appreciable corrosive presence.

 

•  Requires non-magnetic fasteners.

 

•  Will be exposed to any temperatures above 300˚F (149˚C)

If any of the these are issues, please contact 

techsupport@pemnet.com

 for other options.

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

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

Material And Finish Specifications

Fastener Materials

Standard Finishes

For Use in Sheet Hardness 

(1)

Type

Hardened

Steel

300 Series 

Stainless Steel

Hardened 400 

Series Stainless 

Steel

Passivated and/or

tested per ASTM A380

Zinc Plated per ASTM 

B633, SC1 (5µm) Type III, 

Colorless 

(2)

HRB 88 / HB 183 

or less

HRB 80 / HB150 

or less

HRB 70 / HB 125 

or less

SKC

•

•

•

SK4

•

•

•

SKC-F

•

•

•

SK4-F

•

•

•

SKC-R

•

•

•

SK4-R

•

•

•

SKS-R

•

•

•

TSKC-R

•

•

•

TSK4-R

•

•

•

TSKS-R

•

•

•

HSKS-R

•

•

•

HSKC-R

•

•

•

HSK4-R

•

•

•

SKCF-F

•

•

•

SK4F-F

•

•

•

SKSF-F

•

•

•

TSKCF-F

•

•

•

TSK4F-F

•

•

•

TSKSF-F

•

•

•

SKCF

•

•

•

SK4F

•

•

•

SKSF

•

•

•

Part Number Code for Finishes

None

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Keyhole® Standoffs And Fasteners

SK-11

   

PennEngineering • 

www.pemnet.com

SKC™/SK4™/ SKCF™/SK4F™/SKSF™ Standoffs 

1.  Prepare properly sized mounting hole in Panel 1.

2.  Place the fastener through (punched side of) the mounting hole 

and into anvil as shown in figure 1.

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

enough squeezing force to embed the head flush with the panel. 

Through Hole Installation Procedure

1.  Prepare properly sized mounting hole in Panel 1.

2.  Place the fastener into anvil hole as shown in Figure 2.

3.  Place the (punch side of) mounting hole over the shank of the fastener.

4.  With installation punch and anvil surfaces parallel, apply only enough 

squeezing force until flange is flush with panel. 

Blind Hole Installation Procedure

1.  Mill a properly sized blind hole into Panel 1.

2.  Place the fastener into anvil hole as shown in Figure 3.

3.  Place the panel mounting hole over the shank of the fastener.

4.  With installation punch and anvil surfaces parallel, apply only enough 

squeezing force to embed the flange flush with the panel. 

SKC-F™/SK4-F™/ SKCF-F™/SK4-F™/SKSF-F™/ 

TSKCF-F™/TSK4-F™/TSKSF-F™ Fasteners

Installation

  Body Size 

Anvil Dimension (in.)  

 Sheet 

D 

Anvil Part 

Punch Part

 Code 

+.003 -.000  Number Number

  6060 

.216 

970200012300 975200048

  Body Size  Anvil Dimension (mm)  

 Sheet 

D 

Anvil Part 

Punch Part

 Code 

+0.08 

Number Number

 

61.5 

5.49 

970200012300 975200048

  Sheet             Anvil Dimensions (in.)  

 Thickness 

L D 

Anvil Part 

Punch Part

 Code 

Min. 

+.003 -.000 Number  Number

 

1.5  .233 

.184 

8012608 975200048

  Sheet             Anvil Dimensions (mm)  

 Thickness 

L D 

Anvil Part 

Punch Part

 Code 

Min. 

+0.08  Number Number

 

1.5  5.95 

4.67 

8012608 975200048

PEMSERTER® Installation Tooling 

(1)

PEMSERTER® Installation Tooling 

(1)

PUNCH

PANEL 1

L

Min.

Figure 2

FLANGE

D

ANVIL

Figure 3

PUNCH

PANEL 1

L

Min.

FLANGE

D

ANVIL

PUNCH

D

(L+M) +.125” /

(L+M) +3.2 mm

Min.

PANEL 1

Figure 1

HEAD

ANVIL

For “L” and “M” 

see page 3.

(1) 

Click here

 for a quote on Haeger® custom installation tooling.

(1) 

Click here

 for a quote on Haeger® custom installation tooling.

 

Fastener 

Required Size 

PEM

 

Type 

End Mill 

Part No.

 SKC-F/SK4-F 

.213” 

CHM-213

End Mill Information

Double-ended, two-flute H.S.S. center-cutting end mills are available 

from stock. PennEngineering does not manufacture center-cutting 

end mills, but we do keep a supply in stock for your convenience.

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Keyhole® Standoffs And Fasteners

SK-12

    

PennEngineering • 

www.pemnet.com

SKS-R™/SKC-R™/SK4-R™/ TSKS-R™/HSKS-R™/ TSKC-R™/

TSK4-R™/HSKC-R™/HSK4-R™ Fasteners

1.  Prepare properly sized mounting hole in Panel 1.

2.  Place the fastener through (punch side of) the mounting hole 

and into anvil as shown.

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

enough squeezing force to embed the head flush with the panel.

 Neck  Anvil Dimensions (mm)  

  Diameter 

D 

Anvil Part 

Punch Part

 Code 

+0.08 

Number Number

 

2.5  4.65 8026244 

 3.2 

5.65 

8026245  975200048

 4.0 

6.65 

8026246

PEMSERTER® Installation Tooling 

(1)

PUNCH

PANEL 1

M

+.126”/3.2mm

Min.

D

ANVIL

 Neck 

Anvil Dimensions (in.)  

  Diameter 

D 

Anvil Part 

Punch Part

 Code 

+.003 -.000 

Number Number

 

2.5  .183 8026244 

 3.2 

.222 

8026245  975200048

 4.0 

.262 

8026246

Installation Notes

•  For best results we recommend using a 

HAEGER®

 or 

PEMSERTER® machine 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

.

(1) 

Click here

 for a quote on Haeger® custom installation tooling.

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

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tric

Keyhole® Standoffs And Fasteners

SK-13

   

PennEngineering • 

www.pemnet.com

(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)  .040” / 1 mm test sheet material thickness was used for the -2 and -4 SKC/SK4 standoffs due to the short length of the parts.

  Body Size - 

Installation 

Pushout 

Installation 

Pushout 

Installation 

Pushout

 

Sheet 

Code 

(lbs.) (lbs.)  (lbs.)  (lbs.) (lbs.) (lbs.)

 SKC-6060 

1600 

250 

3200 

600 

— 

—

 

SK4-6060 

— — — — 9015 

720

.060” 5052-H34 Aluminum

.060” Cold-Rolled Steel

  Body Size - 

Installation 

Pushout 

Installation 

Pushout 

Installation 

Pushout

 

Sheet 

Code 

(kN) (N)  (kN) (N)  (kN)  (N)

 SKC-61.5 

7.1 

1100 

14.2 

2600 

— 

—

 

SK4-61.5 

— —  — — 40.1 

3200 

1.52 mm 5052-H34 Aluminum

1.52 mm Cold-Rolled Steel

 

 

 

 

 

 

 

                     Length Codes

 

Body Size -

  

-2  -4  -6  -8  -10  -12  -14  -16  -18  -20  -24 -28  -32

  Sheet Code 

Test Sheet Material 

 

 

 

 

          

 Side-Load Force Max. (lbs.)

 

SKC-6060 

5052-H34 

Aluminum 

130 95 82 63 52 44 38 34 30 27 22 19 17

  SKC-6060 

Cold-Rolled Steel 

185 

120 

197 

153 

126 

106 

92 

81 

71 

66 

55 

47 

42

  SK4-6060 

300 Series Stainless Steel 

400 

300 

220 

180 

160 

140 

120 

110 

100 

100 

80 

70 

50

 

Type 

Installation  Pushout  Side-Load Force Max.  Installation  Pushout  Side-Load Force Max.  Installation  Pushout  Side-Load Force Max.

   

(lbs.) (lbs.) 

(lbs.) 

(lbs.)  (lbs.) 

(lbs.) 

(lbs.) (lbs.) 

(lbs.)

 SKC-F 

1100  120 

120 

2100  160 

185 

— 

— 

—

 SK4-F 

— 

— 

— 

— 

— 

— 

10210  292 

202 

.060” 5052-H34 Aluminum

.060” Cold-Rolled Steel

 

Type 

Installation  Pushout  Side-Load Force Max.  Installation  Pushout  Side-Load Force Max.  Installation  Pushout  Side-Load Force Max.

 

  (kN) 

(N) (N)  (kN) 

(N)  (N)  (kN) 

(N) (N)

 SKC-F 

4.9  533 

533 

9.3  711 

822 

—  — 

—

 SK4-F 

— 

— 

— 

— 

— 

— 

45.4  1300 

900 

1.52 mm 5052-H34 Aluminum

1.52 mm Cold-Rolled Steel

SKC™/SK4™ Standoffs

Installation and pushout

SKC-F™/SK4-F™ Fasteners

Installation, Pushout and Side-load

 Test Sheet Material

 Test Sheet Material

 Test Sheet Material

Side-Load

Installation

Force

Pushout

Side-Load

Installation

Force

Pushout

Performance Data

(1)

SKC™/SK4™ Standoffs

Side-load

.060” 300 Series Stainless Steel

1.52 mm 300 Series Stainless Steel

.060” 300 Series Stainless Steel

1.52 mm 300 Series Stainless Steel

Test Sheet Thick. 

.040” 

(2)

 .060”

 

 

 

 

 

 

 

      

 Length Codes

 

Body Size -

  

-2  -4  -6  -8  -10  -12  -14  -16 -18 -20 -22 -25

 

Sheet Code 

Test Sheet Material

 

     

 

Side-Load Force Max. (N)

 

SKC-61.5 

5052-H34 Aluminum 

545 

370 

296 

228 

184 

156 

136 

116 

104 

96 

88 

76

 

SKC-61.5 

Cold-Rolled Steel 

735 

490 

696 

540 

440 

372 

320 

280 

252 

228 

208 

184

 

SK4-61.5 

300 Series Stainless Steel 

1690 

1140 

860 

710 

610 

540 

480 

440 

400 

380 

320 

250 

Test Sheet Thick. 

1 mm 

(2)

 

1.52 mm

 Test Sheet Material

Uni

fie

d

Me

tric

Uni

fie

d

Me

tric

Keyhole® Standoffs And Fasteners

SK-14

    

PennEngineering • 

www.pemnet.com

Part No.

Test Sheet Material

.060” Cold-Rolled Steel

.060” 300 Series Stainless Steel

Installation

(lbs.)

Pushout

(lbs.)

Installation

(lbs.)

Pushout

(lbs.)

SKCF-6060

3300

450

—

—

SKSF-6060

3300

450

—

—

SK4F-6060

—

—

9000

560

SKCF™/SK4F™/SKSF™ Standoffs

Installation and pushout

Side-Load

Installation

Force

Pushout

SKCF™/SK4F™/SKSF™ Standoffs

Side-load

Part No.

Test Sheet Material

1.5mm Cold-Rolled Steel

1.5mm 300 Series Stainless Steel

Installation

(kN)

Pushout

(N)

Installation

(kN)

Pushout

(N)

SKCF-61.5

14.7

2000

—

—

SKSF-61.5

14.7

2000

—

—

SK4F-61.5

—

—

40.1

2500

Part No.

Test Sheet Material

Side Load Force Max. (lbs.)

-4

-6

-8

-10

-12

SKCF-6060

.060” Cold-Rolled Steel

260

197

153

126

106

SKSF-6060

.060” Cold-Rolled Steel

260

197

153

126

106

SK4F-6060

.060” 300 Series Stainless Steel

300

220

180

160

140

Part No.

Test Sheet Material

Side Load Force Max. (N)

-4

-6

-8

-10

SKCF-61.5

1.5mm Cold-Rolled Steel

1000

696

540

440

SKSF-61.5

1.5mm Cold-Rolled Steel

1000

696

540

440

SK4F-61.5

1.5mm 300 Series Stainless Steel

1300

860

710

610

SKCF-F™/SK4F-F™/SKSF-F™/TSKCF-F™/

TSK4F-F™/TSKSF-F™ Fasteners

Installation pushout and side-load

Part No.

Test Sheet Material

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

SKCF-F1.5

.040 ”/ 1mm Cold-Rolled Steel

2518

11.2

160

711

185

822

SKSF-F1.5-ZI

.040” / 1mm Cold-Rolled Steel

2518

11.2

160

711

185

822

SK4F-F1.5

.040” / 1mm 300 Series Stainless Steel

7600

33.8

225

1000

202

900

Side-Load

Installation

Force

Pushout

Part No.

Test Sheet Material

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

TSKCF-F1.5

.032 ”/ 0.8mm Cold-Rolled Steel

2203

9.8

112

500

41

180

TSKSF-F1.5-ZI

.032” / 0.8mm Cold-Rolled Steel

2203

9.8

112

500

41

180

TSK4F-F1.5

.032” / 0.8mm 300 Series Stainless Steel

6789

30.2

169

750

56

250

Keyhole® Standoffs And Fasteners

SK-15

   

PennEngineering • 

www.pemnet.com

Part No.

Test Sheet Material - .040” / 1mm Cold-Rolled Steel HRB 67

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

SKC-R1.5-2.5

3507

15.6

180

800

191

850

SKC-R1.5-3.2

4002

17.8

180

800

180

800

SKC-R1.5-4.0

5755

25.6

202

900

169

750

SKC-R2.0-2.5

3507

15.6

180

800

191

850

SKC-R2.0-3.2

4002

17.8

180

800

180

800

SKC-R2.0-4.0

5755

25.6

202

900

169

750

SKC-R2.5-2.5

3507

15.6

180

800

191

850

SKC-R2.5-3.2

4002

17.8

180

800

180

800

SKC-R2.5-4.0

5755

25.6

202

900

169

750

SKS-R™/SKC-R™/SK4-R™ Fasteners

Installation pushout and side-load

Part No.

Test Sheet Material - .040” / 1mm 300 Series Stainless Steel HRB 88

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

SK4-R1.5-2.5

6115

27.2

270

1200

214

950

SK4-R1.5-3.2

6812

30.3

292

1300

202

900

SK4-R1.5-4.0

7419

33

315

1400

191

850

SK4-R2.0-2.5

6115

27.2

270

1200

214

950

SK4-R2.0-3.2

6812

30.3

292

1300

202

900

SK4-R2.0-4.0

7419

33

315

1400

191

850

SK4-R2.5-2.5

6115

27.2

270

1200

214

950

SK4-R2.5-3.2

6812

30.3

292

1300

202

900

SK4-R2.5-4.0

7419

33

315

1400

191

850

TSKC-R™/TSK4-R™/TSKS-R™ Fasteners

Installation pushout and side-load

Part No.

Test Sheet Material - .032” / 0.8mm Cold-Rolled Steel HRB 67

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

TSKC-R1.5-2.5

2518

11.2

124

550

45

200

TSKC-R2.0-2.5

2518

11.2

124

550

41

180

TSKC-R2.5-2.5

2518

11.2

124

550

34

150

Part No.

Test Sheet Material - .032” / 0.8mm 300 Series Stainless Steel HRB 88

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

TSK4-R1.5-2.5

5710

25.4

169

750

68

300

TSK4-R2.0-2.5

5710

25.4

169

750

63

280

TSK4-R2.5-2.5

5710

25.4

169

750

56

250

Part No.

Test Sheet Material - .032” / 0.8mm Cold-Rolled Steel HRB 67

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

TSKS-R1.5-2.5-ZI

2518

11.2

124

550

45

200

TSKS-R2.0-2.5-ZI

2518

11.2

124

550

41

180

TSKS-R2.5-2.5-ZI

2518

11.2

124

550

34

150

Side-Load

Installation

Force

Pushout

Side-Load

Installation

Force

Pushout

Part No.

Test Sheet Material - .040” / 1mm Cold-Rolled Steel HRB 67

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

SKS-R1.5-2.5-ZI

3200

14.2

160

711

191

850

SKS-R1.5-3.2-ZI

4000

17.8

180

800

213

950

SKS-R1.5-4.0-ZI

5000

22.3

180

800

258

1150

SKS-R2.0-2.5-ZI

3200

14.2

160

711

169

750

SKS-R2.0-3.2-ZI

4000

17.8

180

800

191

850

SKS-R2.0-4.0-ZI

5000

22.3

180

800

225

1000

SKS-R2.5-2.5-ZI

3200

14.2

160

711

124

550

SKS-R2.5-3.2-ZI

4000

17.8

180

800

137

610

SKS-R2.5-4.0-ZI

5000

22.3

180

800

182

810

Keyhole® Standoffs And Fasteners

SK-16

    

PennEngineering • 

www.pemnet.com

Performance Data

HSKC-R™/HSK4-R™/HSKS-R™ Fasteners

Installation pushout and side-load

Part No.

Test Sheet Material - .047” / 1.2mm Cold-Rolled Steel HRB 67

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

HSKC-R1.5-2.5

4002

17.8

225

1000

202

900

HSKC-R1.5-3.2

5013

22.3

247

1100

191

850

HSKC-R1.5-4.0

5508

24.5

270

1200

180

800

HSKC-R2.0-2.5

4002

17.8

225

1000

202

900

HSKC-R2.0-3.2

5013

22.3

247

1100

191

850

HSKC-R2.0-4.0

5508

24.5

2701

1200

180

800

HSKC-R2.5-2.5

4002

17.8

225

1000

202

900

HSKC-R2.5-3.2

5013

22.3

247

1100

191

850

HSKC-R2.5-4.0

5508

24.5

270

1200

180

800

Part No.

Test Sheet Material - .047” / 1.2mm 300 Series Stainless Steel HRB 88

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

HSK4-R1.5-2.5

7194

32

315

1400

225

1000

HSK4-R1.5-3.2

7868

35

337

1500

214

950

HSK4-R1.5-4.0

9442

42

337

1500

202

900

HSK4-R2.0-2.5

7194

32

315

1400

225

1000

HSK4-R2.0-3.2

7868

35

337

1500

214

950

HSK4-R2.0-4.0

9442

42

337

1500

202

900

HSK4-R2.5-2.5

7194

32

315

1400

225

1000

HSK4-R2.5-3.2

7868

35

337

1500

214

950

HSK4-R2.5-4.0

9442

42

337

1500

202

900

Part No.

Test Sheet Material - .047” / 1.2mm Cold-Rolled Steel HRB 67

Installation

Pushout

Side-Load Force Max.

(lbs.)

(kN)

(lbs.)

(N)

(lbs.)

(N)

HSKS-R1.5-2.5-ZI

4002

17.8

225

1000

202

900

HSKS-R1.5-3.2-ZI

5013

22.3

247

1100

191

850

HSKS-R1.5-4.0-ZI

5508

24.5

270

1200

180

800

HSKS-R2.0-2.5-ZI

4002

17.8

225

1000

202

900

HSKS-R2.0-3.2-ZI

5013

22.3

247

1100

191

850

HSKS-R2.0-4.0-ZI

5508

24.5

270

1200

180

800

HSKS-R2.5-2.5-ZI

4002

17.8

225

1000

202

900

HSKS-R2.5-3.2-ZI

5013

22.3

247

1100

191

850

HSKS-R2.5-4.0-ZI

5508

24.5

270

1200

180

800

3/02/23

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.

North America: 

Danboro, Pennsylvania USA 

|

 E-mail: 

info@pemnet.com

 

|

 Tel: +1-215-766-8853 

|

 800-237-4736 (USA)

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 Galway, Ireland 

|

 E-mail: 

europe@pemnet.com

 

|

 Tel: +353-91-751714

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|

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|

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|

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Visit our PEMNET™ Resource Center at 

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•

 Technical support e-mail: 

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