Thread Screw Pitches


Thread Screw Pitches


Diameter in inches
Inch series

Threads per inch

BSWBSFUNCUNF

No. 8

32

36

No. 10

24

32

3/16

24

32

1/4

20

26

20

28

5/16

18

22

18

24

3/8

16

20

16

24

7/16

14

18

14

20

1/2

12

16

13

20

9/16

12

16

12

18

5/8

11

14

11

18

3/4

10

12

10

16

7/8

9

11

9

14

1

8

10

8

12

11/8

7

9

7

12

11/4

7

9

7

12

13/8

6

8

6

12

11/2

6

8

6

12

15/8

5

8

13/4

5

7

5

2

4.5

7

4.5

21/4

4

6

4.5

21/2

4

6

4

23/4

3.5

6

4

3

3.5

5

4



ISO Metric Preferred Coarse Pitch Series

Diameter in mm

Pitch in mm

1.6

0.35

2

0.4

2.5

0.45

3

0.5

4

0.7

5

0.8

6

1

8

1.25

10

1.5

12

1.75

16

2

20

2.5

24

3

30

3.5

36

4

42

4.5

48

5

56

5.5

64

6


Thread Screw Pitches.pdf