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Thread code

25.4mm teeth per

Nominal diameter

d

Pitch

p

d1

l

L

l1

Square head

a

l2

1/8-40BSW

40

3.175

0.635

3.15

11

48

7

2.50

5

3/16-24BSW

24

4.762

1.058

5.00

16

58

9

4.00

7

1/4-20BSW

20

6.350

1.270

6.30

19

66

11

5.00

8

5/16-18BSW

18

7.938

1.411

8.00

22

72

13

6.30

9

3/8-16BSW

16

9.525

1.588

10.00

24

80

15

8.00

11

Note: No empty magazine slots when the threaded portion of the length scale of l + l 1/2

Thread code

25.4mm teeth per

Nominal diameter

d

Pitch

p

d1

l

L

l1

Square head

a

l2

3/16-32BSF

32

4.762

0.794

5.00

16

58

9

4.00

7

7/32-28BSF

28

5.556

0.907

5.60

17

62

9

4.50

7

1/4-26BSF

26

6.350

0.977

6.30

19

66

11

5.00

8

9/32-26BSF

26

7.144

0.977

7.10

19

66

11

5.60

8

5/16-22BSF

22

7.938

1.154

8.00

22

72

13

6.30

9

3/8-20BSF

20

9.525

1.270

10.00

24

80

15

6.00

11

Note: No empty magazine slots when the threaded portion of the length scale of l + l 1/2