Thread Code

Rec Min. Sheet Thickness

C
-.005

H
Nom.

Hole size In Sheet
+.003

440

.040

.165

.187

.166

6440

.040

.212

.250

.213

632

.040

.212

.250

.213

8632

.050

.280

.312

.281

832

.050

.280

.312

.281

032

.050

.280

.312

.281

Thread Code

Rec Min. Sheet Thickness

C
-0.13

H
Nom.

Hole size In Sheet
+0.08

M2.5

1.02

4.20

4.75

4.22

M3

1.02

4.20

4.75

4.22

3.5M3

1.02

5.39

6.35

5.41

M3.5

1.02

5.39

6.35

5.41

M4

1.27

5.98

7.00

6.00

3.5M4

1.27

7.12

8.00

7.14

M5

1.27

7.12

8.00

7.14

M6

1.30

8.72

10.00

8.75

UNIFIED

Thread Size

Type

Thread Code

Length "L" +.002 -.005 (Length code is in 32ths of an inch )

Min.Dist Hole C/L To Edge

Steel

Stainless Steel

Aluminum

.312

.375

.437

.500

.562

.625

.687

.750

.812

.875

.937

1.00

1.062

.112-40(#4-40)

BSO

BSOS

BSOA

440

10

12

14

16

18

20

22

24

26

28

30

32

34

.23

6440

.138-32(#6-32)

BSO

BSOS

BSOA

632

10

12

14

16

18

20

22

24

26

28

30

32

34

.27

8632

.164-32(#8-32)

BSO

BSOS

BSOA

832

10

12

14

16

18

20

22

24

26

28

30

32

34

.31

.190-32(#10-32)

BSO

BSOS

BSOA

032

10

12

14

16

18

20

22

24

26

28

30

32

34

.31

F Dimension Min.

.156

.187

.250

.375

METRIC

Thread Size

Type

Thread Code

Length "L" +0.05 -0.13 (Length Code is in millimeters )

Min.Dist Hole C/L To Edge

Steel

Stainless Steel

Aluminum

M2.5X0.45

BSO

BSOS

BSOA

M2.5

6

8

10

12

14

16

18

20

22

25

/

/

/

6

M3X0.5

BSO

BSOS

BSOA

M3

6

8

10

12

14

16

18

20

22

25

/

/

/

6

3.5M3

6.8

M3.5X0.6

BSO

BSOS

BSOA

M3.5

6

8

10

12

14

16

18

20

22

25

/

/

/

6.8

M4X0.7

BSO

BSOS

BSOA

M4

6

8

10

12

14

16

18

20

22

25

/

/

/

7.5

3.5M4

8

M5X0.8

BSO

BSOS

BSOA

M5

6

8

10

12

14

16

18

20

22

25

/

/

/

8

M6X1.0

BSO

BSOS

BSOA

M6

6

8

10

12

14

16

18

20

22

25

/

/

/

9

F Dimension Min.

3.2

4

5

6.5

9.5