PITCH CONVERSION TABLE

APPROXIMATE THREADS per INCH

PITCH mm

APPROXIMATE THREADS per cm

338 1/2

0.075

133.33

317 1/2

0.08

125.00

282 1/4

0.09

111.11

254

0.1

100.00

203 1/4

0.125

80.00

169 1/4

0.15

66.67

145 1/4

0.175

57.14

127

0.2

50.00

101 1/2

0.25

40.00

84 3/4

0.3

33.33

72 1/2

0.35

28.57

63 1/2

0.4

25.00

56 1/2

0.45

22.22

50 3/4

0.5

20.00

42 1/4

0.6

16.67

36 1/4

0.7

14.29

33 3/4

0.75

13.33

31 3/4

0.8

12.50

28 1/4

0.9

11.11

25 1/2

1

10.00

20 1/4

1.25

8.00

17

1.5

6.67

14 1/2

1.75

5.71

12 3/4

2

5.00

10 1/4

2.5

4.00

8 1/2

3

3.33

7 1/4

3.5

2.86

6 1/4

4

2.50

5 3/4

4.5

2.22

5

5

2.00

4 1/2

5.5

1.82

4 1/4

6

1.67

NOTES: [ P=PITCH ] [ 1cm=10mm ] [10/P=Threads/cm ] [25.4/P=Threads/inch ]