Gear Pitch Conversion Chart

A chart of common gear pitches arranged by size with their corresponding pitches in other measurement units. Contains diametral pitch, circular pitch and modules.

The numbers in bold represents the standard units for that particular unit of measure.

For non-standard pitches see our Gear Pitch Conversion page for the formulas used to convert pitches.
 

Diametral Pitch Circular Pitch Module
0.3387 9.2764 75
0.3629 8.658 70
0.3908 8.0395 65
0.4233 7.4211 60
0.4618 6.8027 55
0.5 6.2832 50.8
0.508 6.1843 50
0.5644 5.5658 45
0.6048 5.1948 42
0.6513 4.8237 39
0.7056 4.4527 36
0.75 4.1888 33.867
0.7697 4.0816 33
0.7854 4 12.128
0.8467 3.7106 30
0.8976 3.5 12
0.9407 3.3395 27
1 3.1416 25.4
1.0472 3 11.622
1.0583 2.9684 24
1.1424 2.75 11.289
1.1545 2.7211 22
1.25 2.5133 20.32
1.2566 2.5 11.117
1.27 2.4737 20
1.3963 2.25 11
1.4111 2.2263 18
1.5 2.0944 16.933
1.5708 2 10.612
1.5875 1.979 16
1.6755 1.875 10.16
1.6933 1.8553 15
1.75 1.7952 14.514
1.7952 1.75 10
1.8143 1.7316 14
1.9333 1.625 9.236
1.9538 1.6079 13
2 1.5708 12.7
2.0944 1.5 9.096
2.1167 1.4842 12
2.1855 1.4375 9
2.25 1.3963 11.289
2.2848 1.375 8.59
2.3091 1.3605 11
2.3936 1.3125 8.467
2.5 1.2566 10.16
2.54 1.2369 10
2.75 1.1424 9.236
2.7925 1.125 8.085
2.8222 1.1132 9
2.9568 1.0625 8
3 1.0472 8.467
3.1416 1 7.58
3.175 0.9895 8
3.351 0.9375 7.257
3.5 0.8976 7.257
3.5904 0.875 7.074
3.6286 0.8658 7
3.8666 0.8125 7
3.9077 0.804 6.5
4 0.7854 6.35
4.1888 0.75 6.569
4.2333 0.7421 6
4.5 0.6981 5.644
4.5696 0.6875 6.5
4.6182 0.6803 5.5
4.71 0.667 6.35
5 0.6283 5.08
5.0266 0.625 6.064
5.08 0.6184 5
5.5851 0.5625 6
5.6444 0.5566 4.5
6 0.5236 4.233
6.2832 0.5 5.644
6.35 0.4947 4
6.7733 0.4638 3.75
7 0.4488 3.629
7.1808 0.4375 5.558
7.2571 0.4329 3.5
7.8154 0.402 3.25
7.854 0.4 5.5
8 0.3927 3.175
8.3776 0.375 5.393
8.4667 0.3711 3
9 0.3491 2.822
9.2364 0.3401 2.75
9.4342 0.333 5.08
10 0.3142 2.54
10.0531 0.3125 5.053
10.16 0.3092 2.5
10.9846 0.286 5
11 0.2856 2.309
11.2889 0.2783 2.25
12 0.2618 2.117
12.5664 0.25 4.548
12.7 0.2474 2
13 0.2417 1.954
14 0.2244 1.814
14.1514 0.222 4.5
14.5143 0.2164 1.75
15 0.2094 1.693
15.708 0.2 4.233
16 0.1964 1.588
16.7552 0.1875 4.043
16.9333 0.1855 1.5
17 0.1848 1.494
18 0.1745 1.411
18.812 0.167 4
19 0.1653 1.337
20 0.1571 1.27
20.32 0.1546 1.25
22 0.1428 1.155
24 0.1309 1.058
25.4 0.1237 1
26 0.1208 0.977
28 0.1122 0.907
28.2222 0.1113 0.9
30 0.1047 0.847
31.75 0.0989 0.8
32 0.0982 0.794
34 0.0924 0.747
36 0.0873 0.706
36.2857 0.0866 0.7
42.3333 0.0742 0.6
50.8 0.0618 0.5
63.5 0.0495 0.4
84.6667 0.0371 0.3
 

 

 

 


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