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SO-3

SELF-CLINCHING STANDOFFS

Min.

Hole Size

B

Thread

Sheet

In Sheet

Counter-

C

H

Min. Dist.

D

Code

Thickness

+.003

Bore Dia.

+.000

Nom.

Hole C/

±.010

-.000

±.005

-.005

To Edge

440

.040

.166

.125

.165

.187

.23

6440

.040

.213

.125

.212

.250

.27

632

.040

.213

.156

.212

.250

.27

8632

.050

.281

.156

.280

.312

.31

832

.050

.281

.188

.280

.312

.31

032

.050

.281

.203

.280

.312

.31

Type

Thread

Fastener Material

Thread

Size

Stainless

Hardened

Code

Steel

Steel

Aluminum Stainless Steel

.125

.187

.250 .312

.375

.437

.500

.562

.625

.687

.750

.812

.875

.937

1.00

1.062

.112-40

SO

SOS

SOA

SO4

440

4

6

8

10

12

14

16

18

20

22

24

–

–

–

–

–

(#4-40)

6440(1)

.138-32

SO

SOS

SOA

SO4

632

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

(#6-32)

8632(1)

.164-32

SO

SOS

SOA

SO4

832

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

(#8-32)

.190-32

SO

SOS

SOA

SO4

032

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

(#10-32)

D Dimension ±.010

None

.187

.312

.437

Min.

B

Thread

Sheet

Hole Size

Counter-

C

H

Min. Dist.

D

Code

Thickness

In Sheet

Bore Dia.

-0.13

Nom.

Hole C/

±0.25

+0.08

±0.13

To Edge

M3

1

4.22

3.2

4.2

4.8

6

3.5M3

1

5.41

3.2

5.39

6.4

6.8

M3.5

1

5.41

3.9

5.39

6.4

6.8

M4

1.27

7.14

4.8

7.12

7.9

8

M5

1.27

7.14

5.35

7.12

7.9

8

(1) Standoffs with thread codes 6440, 8632, and 3.5M3 have a thicker wall to provide more bearing surface for the mating component or panel

reducing the chance of cracking or cutting into the board.

Please contact your local PEM® distributor for availability, minimum quantity, and pricing information.

All dimensions are in millimeters.

GENERAL DIMENSIONAL DATA

All dimensions are in inches.

Type

Thread

Fastener Material

Thread

Size x

Stainless

Hardened

Code

Pitch

Steel

Steel

Aluminum Stainless Steel

M3 x 0.5

SO

SOS

SOA

SO4

M3

3

4

6

8

10

12

14

16

18

–

–

–

3.5M3(1)

M3.5 x 0.6

SO

SOS

SOA

SO4

M3.5

3

4

6

8

10

12

14

16

18

20

22

25

M4 x 0.7

SO

SOS

SOA

SO4

M4

3

4

6

8

10

12

14

16

18

20

22

25

M5 x 0.8

SO

SOS

SOA

SO4

M5

3

4

6

8

10

12

14

16

18

20

22

25

D Dimension ±0.25

None

4

8

11

THREAD SIZE AND LENGTH SELECTION DATA

All dimensions are in inches.

All dimensions are in millimeters.

Length “L” +.002 –.005 (Length Code in 32nds of an inch)

Length “L” +0.05 –0.13

(Length Code in millimeters)

SO™/SOS™/SOA™/SO4™ - THROUGH-HOLE THREADED STANDOFFS

Varies

according

to length.

See length

charts

below.

Varies

according

to length.

See length

charts

below.

SO

– 440 – 8

ZI

SO

S – 440 – 8

SO

A – 440 – 8

SO

4 – 440 – 8

NC*

PART NUMBER DESIGNATION

Material

Code

Thread

Code

Length

Code

Type

Finish

SO/SOS/SOA

SO4

Installs into stainless steel

Clinching profile may vary.

H

L

D

B

C

PEM® “Single” or PEM® “Two Groove” Registered Trademark

* NC suffix is required if optional nickel plating (for corrosion resistance) is desired.

Otherwise, no suffix is necessary.

Micro sizes also available.

See PEM® Bulletin MPF for more information.

• SO standoffs are recommended for use in steel or aluminum sheets HRB (Rockwell “B” scale) 80 / HB (Hardness Brinell) 150 or less.

• SOS standoffs are recommended for use in steel or aluminum sheets HRB (Rockwell “B” scale) 70 / HB (Hardness Brinell) 125 or less.

• SOA standoffs are recommended for use in aluminum sheets HRB (Rockwell “B” scale) 50 / HB (Hardness Brinell) 82 or less.

• SO4 standoffs are recommended for use in stainless steel sheets HRB (Rockwell “B” scale) 88 / HB (Hardness Brinell) 183 or less.