SELF-CLINCHING NUTS - PennEngineering

PEM? brand self-clinching nuts install permanently in aluminum, steel or stainless steel sheets.

CLTM

SELF-CLINCHING NUTS

SELF-CLINCHING NUTS

Self-clinching nuts are installed by placing them in properly sized holes in sheets and applying a parallel squeezing force to the head of the nut. The sheet metal surrounding the head cold flows into an undercut thereby making the fastener an integral part of the sheet. A serrated clinching ring prevents the fastener from rotating after installation.

STM/SSTM/CLATM/CLSTM/CLSSTM nuts provide load-bearing threads in thin sheets with high pushout and torque-out resistance - PAGES 4 and 5

SPTM, PEM 300? nuts provide strong load-bearing threads in stainless steel sheets as thin as .030"/0.8 mm PAGES 4 and 5

PEM RT? free-running locknuts are free-running until clamp load is induced. A modified thread angle on the loaded flank provides the vibration resistant locking feature- PAGE 6

SLTM self-locking nuts are designed with a unique and economical TRI-DENT? locking feature, meeting 3 cycle locking performance requirements - PAGE 7

HTM (non-locking) and HNLTM (locking) nuts have threads that provide high pushout and torque-out resistance PAGE 8

SHTM hard panel nuts install into thin, harder, high strength steel materials PAGE 8

SMPSTM/SMPPTM nuts are for thinner sheet/close-to-edge applications PAGE 9

Material and finish specifications - PAGE 9

Installation - PAGES 10 and 13

Performance data - PAGES 14 - 17

Many PEM self-clinching nuts in this bulletin are dimensionally equivalent to nuts manufactured to NASM45938/1 specifications. Consult our Marketing department for a complete Military Specifications and National Aerospace Standards guide (Bulletin NASM) on our website.

Screws for use with PEM self-clinching locking fasteners should be Class 3A/4h fit or no smaller than Class 2A/6g.

PEM? Stamp (Registered Trademark)

PEM? Two Groove (Registered Trademark) PEM RT? Stamp (Registered Trademark)

SH (Registered Trademark)

Fasteners For Stainless Steel SP Identification Mark

SMPP Identification Mark

Fastener drawings and models are available at

CL-2 PennEngineering ?

? 2021 PennEngineering.

SELF-CLINCHING NUTS

PEM? SELF-CLINCHING NUT SELECTOR GUIDE

PEM Nut Type

S/SS/H

Recommended panel

material (1)

steel / aluminum

Thinnest sheet .025" /

0.64 mm

Application Requires:

Locking Threads

Free- Prevailing running torque

Closest centerline-toedge distance

Superior corrosion resistance

Recommended for installation into stainless steel sheets

Compatible with aluminum

anodizing

Harder high strength steel material

Non-magnetic

CLS/CLSS steel / aluminum

?

?

CLA

aluminum

?

?

?

SP

stainless steel

?

?

?

PEM RT? steel / aluminum

?

SL

steel / aluminum

?

HNL

aluminum

?

SH

hardened alloy steel

?

SMPS

steel / aluminum

?

?

?

?

SMPP

stainless steel

?

?

?

?

?

(1) Describes "best practice" for typical applications. Fasteners can be used in other panel materials not listed here if specified hardness limits are met. In all cases "For Use in Sheet Hardness" information is shown in chart on page 9.

THREAD MASKING

PEM? PreTectTM thread masking solution provides protection for PEM? internally threaded fasteners. They reduce labor and protect threads from paint and powder coating processes. Fasteners are shipped with plugs and film (where applicable) already in place. Click here for more information.

Thread mask is available for applications where hardware is installed prior to painting. During assembly, the threads of the mating hardware will remove paint, electro deposited automotive under coatings, and weld spatter upon application of torque. PEM? nuts can be specially ordered with thread mask applied. Click here for more information.

Thread mask color may vary.

"BC" suffix will be added to part number to designate thread mask to fastener.

AVAILABLE PEM? VARIMOUNT? FASTENING SYSTEM

The PEM? VariMount? fastening system (see PEM? Bulletin VM) utilizes a self-clinching nut paired with a round steel or stainless steel base plate to offer a clean and ready-made assembly for mounting into any rigid material or panel, including composites, plastics, and metals. Multiple radial holes in the base plate and a generous footprint provide effective mounting of the assembly. Mounting can be performed either on the front or through the back of a panel.

PennEngineering ? CL-3

SELF-CLINCHING NUTS

? S/SS nuts are recommended for use in steel or aluminum sheets HRB 80 / HB 150 or less.

? CLS/CLSS nuts are recommended for use in steel or aluminum sheets HRB 70 / HB 125 or less.

? SP nuts are recommended for use in stainless steel sheets HRB 90 / HB 192 or less.

? CLA nuts are recommended for use in steel or aluminum sheets HRB 50 / HB 82 or less.

PART NUMBER DESIGNATION

S

? 632 ? 1 ZI

SS

? 032 ? 1 ZI

CL S ? 632 ? 1

CLS S ? 032 ? 1

S P ? 632 ? 1

CL A ? 632 ? 1

Type Material Code

Thread Size Code

Shank Finish Code

STM/SSTM/CLSTM/CLSSTM/SPTM NUTS All dimensions are in inches.

UNIFIED

Thread Size

.086-56 (#2-56)

.099-48 (#3-48)

.112-40 (#4-40)

Carbon Steel

Type

Fastener Material

Stainless

Hardened

Steel

Stainless Steel

S

CLS

SP

Thread Code

256

S

CLS

--

348

S

CLS

SP

440

.138-32 (#6-32)

S

CLS

SP

632

.164-32 (#8-32)

S

CLS

SP

832

.190-24 (#10-24)

SS

CLSS

SP

024

.190-32 (#10-32)

SS

CLSS

SP

032

.216-24 (#12-24)

S

CLS

--

1224

.250-20 (1/4-20)

S (3)

CLS

SP

0420

.250-28 (1/4-28)

S

CLS

--

0428

.313-18 (5/16-18)

S (3)

CLS

SP

0518

.313-24 (5/16-24)

S

CLS

SP

0524

.375-16 (3/8-16)

S

CLS

SP

0616

.375-24 (3/8-24)

S

CLS

SP

0624

.438-20 (7/16-20)

S

--

--

0720

.500-13 (1/2-13)

S

CLS

--

0813

.500-20 (1/2-20)

S

CLS

--

0820

Shank Code

0 1 2 0 1 2 0 1 2 3 (2) 0 1 2 3 (2) 0 1 2 3 (2) 0 1 2 3 (2) 0 1 2 3 (2) 1 2 3 0 1 2 3 (2) 1 2 3 1 2 3 (2) 1 2 3 (2) 1 2 3 (2) 1 2 3 (2)

1

1 2 1 2

A (Shank)

Max.

.030 .038 .054 .030 .038 .054 .030 .038 .054 .087 .030 .038 .054 .087 .030 .038 .054 .087 .030 .038 .054 .087 .030 .038 .054 .087 .038 .054 .087 .045 .054 .087 .120 .054 .087 .120 .054 .087 .120 .054 .087 .120 .087 .120 .235 .087 .120 .235

.087

.120 .235 .120 .235

Rec. Min. Sheet Thickness (1)

.030 .040 .056 .030 .040 .056 .030 .040 .056 .090 .030 .040 .056 .090 .030 .040 .056 .090 .030 .040 .056 .090 .030 .040 .056 .090 .040 .056 .090 .047 .056 .090 .125 .056 .090 .125 .056 .090 .125 .056 .090 .125 .090 .125 .250 .090 .125 .250

.092

.125 .250 .125 .250

E

C

A

(Clinching profile may vary) Due to manufacturing procedure, parts may have a counterbore at shank end.

Hole Size In Sheet +.003 ?.000

C Max.

E ?.010

T ?.010

.166

.165

.250

.070

.166

.165

.250

.070

.166

.165

.250

.070

.1875

.187

.280

.070

.213

.212

.310

.090

.250

.249

.340

.090

.250

.249

.340

.090

.277

.276

.370

.130

.344

.343

.440

.170

.344

.343

.440

.170

.413

.412

.500

.230

.413

.412

.500

.230

.500

.499

.560

.270

.500

.499

.560

.270

.562

.561

.687

.311

.656

.655

.810

.360

T

Min. Dist. Hole CL To Edge

.19 .19 .19

.22

.27

.28

.28 .31 .34 .34 .38 .38 .44 .44 .562 .63

(1) For maximum performance, we recommend that you use the maximum shank length for your sheet thickness. (2) This shank code not available for SP nuts. (3) This thread size S nut, with a -2 shank code, can be installed successfully without the need to pre punch a mounting hole in a separate operation. See

page 15 for more information.

The increased hardness of stainless steel panels requires careful consideration when installing selfclinching fasteners. See page 16 or refer to Fastener Installation Dos and Don'ts on our website.

CL-4 PennEngineering ?

SELF-CLINCHING NUTS

STM/SSTM/CLSTM/CLSSTM/SPTM NUTS (See drawing at top of page 4) All dimensions are in millimeters.

METRIC

Type

Thread

Fastener Material

A

Rec.

Hole Size

Thread

Shank

(Shank)

Min. Sheet

In Sheet

C

E

Min. Dist.

T

Hole CL

Size

Carbon Stainless

Hardened

Code

Code

Max.

Thickness

+0.08

Max.

?0.25

?0.25

To Edge

Steel

Steel Stainless Steel

(1)

0 (2)

0.77

0.8

M2 x 0.4

S

CLS

SP

M2

1

0.97

1

4.22

4.2

6.35

1.5

4.8

2

1.38

1.4

0

0.77

0.8

M2.5 x 0.45

S

CLS

SP

M2.5

1

0.97

1

4.22

4.2

6.35

1.5

4.8

2

1.38

1.4

0

0.77

0.8

M3 x 0.5

S

CLS

SP

M3

1

0.97

1

4.22

4.2

6.35

1.5

4.8

2

1.38

1.4

0

0.77

0.8

M3.5 x 0.6

S

CLS

--

M3.5

1

0.97

1

4.75

4.73

7.11

1.5

5.6

2

1.38

1.4

0

0.77

0.8

M4 x 0.7

S

CLS

SP

M4

1

0.97

1

5.41

5.38

7.87

2

6.9

2

1.38

1.4

0

0.77

0.8

M5 x 0.8

SS

CLSS

SP

M5

1

0.97

1

6.35

6.33

8.64

2

7.1

2

1.38

1.4

00 (2)

0.89

0.92

M6 x 1

S (3)

CLS

SP

M6

0 (2)

1.15

1

1.38

1.2 1.4

8.75

8.73

11.18

4.08

8.6

2

2.21

2.29

M8 x 1.25

S (3)

CLS

SP

M8

1 2

1.38 2.21

1.4 2.29

10.5

10.47

12.7

5.47

9.7

M10 x 1.5

S

CLS

SP

M10

1

2.21

2.29

2 (2)

3.05

3.18

14

13.97

17.35

7.48

13.5

M12 x 1.75

S

--

--

M12

1

3.05

3.18

17

16.95

20.57

8.5

16

CLATM NUTS (See drawing at top of page 4) All dimensions are in inches.

UNIFIED

Type

Thread

Fastener Material Thread

Shank

A (Shank)

Min. Sheet Thickness

Hole Size In Sheet

C

E

Min. Dist.

T

Hole CL

Size

Aluminum

Code

Code

Max.

(1)

?.003 -.000

Max.

?.010

?.010

To Edge

.086-56 (#2-56)

CLA

256

1 2

.038

.040

.054

.056

.166

.165

.250

.070

.19

.112-40 (#4-40)

CLA

440

1 2

.038

.040

.054

.056

.1875

.187

.250

.090

.22

.138-32 (#6-32)

CLA

632

1 2

.038

.040

.054

.056

.213

.212

.280

.090

.27

.164-32 (#8-32)

CLA

832

1 2

.038

.040

.054

.056

.234

.233

.310

.130

.28

.190-24 (#10-24)

CLA

024

1 2

.038

.040

.054

.056

.296

.295

.370

.160

.31

.190-32 (#10-32)

CLA

032

1 2

.038

.040

.054

.056

.296

.295

.370

.160

.31

.250-20 (1/4-20)

CLA

1

0420

2

3

.054

.056

.087

.091

.120

.125

.344

.343

.440

.170

.34

(See drawing at top of page 4) All dimensions are in millimeters.

METRIC

Type

Thread Size x

Fastener Material Thread

Shank

A (Shank)

Min. Sheet Thickness

Hole Size In Sheet

C

Pitch

Aluminum

Code

Code

Max.

(1)

+0.08

Max.

1

0.98

1

M2 x 0.4

CLA

M2

2

1.38

1.4

4.22

4.2

M3 x 0.5

CLA

M3

1 2

0.98 1.38

1 1.4

4.75

4.73

M3.5 x 0.6

CLA

M3.5

1 2

0.98 1.38

1 1.4

5.41

5.38

M4 x 0.7

CLA

M4

1 2

0.98 1.38

1 1.4

5.94

5.92

M5 x 0.8

CLA

M5

1 2

0.98 1.38

1 1.4

7.52

7.49

M6 x 1

CLA

M6

1 2

1.38

1.4

2.21

2.3

8.75

8.73

Min. Dist.

E

T

Hole CL

?0.25

?0.25

To Edge

6.35

1.5

4.8

6.35

2

5.6

7.11

2

6.9

7.8

3

7.1

9.4

3.8

7.9

11.18

4.08

8.6

(1) For maximum performance, we recommend that you use the maximum shank length for your sheet thickness. (2) This shank code not available for SP nuts. (3) This thread size S nut, with a -2 shank code, can be installed successfully without the need to pre punch a mounting hole in a separate operation. See

page 15 for more information.

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