SO-4 PennEngineering • www.pemnet.com

SELF-CLINCHING STANDOFFS

Min.

Hole Size

Thread

Sheet

In Sheet

C

H

Min. Dist.

F

Code

Thickness

+.003

+.000

Nom.

Hole C/

Min.

-.000

-.005

To Edge

440

.040

.166

.165

.187

.23

6440

.040

.213

.212

.250

.27

632

.040

.213

.212

.250

.27

8632

.050

.281

.280

.312

.31

832

.050

.281

.280

.312

.31

032

.050

.281

.280

.312

.31

Type

Thread

Thread

Size x

Stainless

Hardened

Code

Pitch

Steel

Steel

Aluminum

Stainless Steel

M3 x 0.5

BSO

BSOS

BSOA

BSO4

M3

6

8

10

12

14

16

18

20

22

25

3.5M3(1)

M3.5 x 0.6

BSO

BSOS

BSOA

BSO4

M3.5

6

8

10

12

14

16

18

20

22

25

M4 x 0.7

BSO

BSOS

BSOA

BSO4

M4

6

8

10

12

14

16

18

20

22

25

M5 x 0.8

BSO

BSOS

BSOA

BSO4

M5

6

8

10

12

14

16

18

20

22

25

F Dimension Min.

3.2

4

5

6.5

9.5

Min.

Hole Size

Min. Dist.

Thread

Sheet

In Sheet

C

H

Hole C/

F

Code

Thickness

+0.08

-0.13

Nom.

To Edge

Min.

M3

1

4.22

4.2

4.8

6

3.5M3

1

5.41

5.39

6.4

6.8

M3.5

1

5.41

5.39

6.4

6.8

M4

1.27

7.14

7.12

7.9

8

M5

1.27

7.14

7.12

7.9

8

All dimensions are in millimeters.

GENERAL DIMENSIONAL DATA

All dimensions are in inches.

THREAD SIZE AND LENGTH SELECTION DATA

All dimensions are in inches.

All dimensions are in millimeters.

Length “L” +0.05 –0.13

(Length Code in millimeters)

BSO™/BSOS™/BSOA™/BSO4™ - BLIND THREADED STANDOFFS

Type

Thread

Thread

Size

Stainless

Hardened

Code

Steel

Steel

Aluminum Stainless Steel

.312

.375

.437

.500

.562

.625

.687

.750

.812

.875

.937

1.00

1.062

.112-40

BSO

BSOS

BSOA

BSO4

440

10

12

14

16

18

20

22

24

26

28

30

32

34

(#4-40)

6440(1)

.138-32

BSO

BSOS

BSOA

BSO4

632

10

12

14

16

18

20

22

24

26

28

30

32

34

(#6-32)

8632(1)

.164-32

BSO

BSOS

BSOA

BSO4

832

10

12

14

16

18

20

22

24

26

28

30

32

34

(#8-32)

.190-32

BSO

BSOS

BSOA

BSO4

032

10

12

14

16

18

20

22

24

26

28

30

32

34

(#10-32)

F Dimension Min.

.156

.187

.250

.375

Varies

according

to length.

See length

charts

below.

Varies

according

to length.

See length

charts

below.

BSO

– 440 – 12

ZI

BSO

S – 440 – 12

BSO

A – 440 – 12

BSO

4 – 440 – 12

NC*

PART NUMBER DESIGNATION

Material

Code

Thread

Code

Length

Code

Type

Finish

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

BSO/BSOS/BSOA

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

Clinching profile may vary.

H

C

F

L

BSO4

Installs into stainless steel

(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.

* NC suffix is required if optional nickel plating (for corrosion resistance) is desired. Otherwise, no suffix is necessary.

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

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

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

• BSO4 standoffs are recommended for use in stainless steel sheets HRB (Rockwell “B” scale) 88 / HB (Hardness Brinell) 183 or less.