Screw Thread Conversion Table

MAJOR DIAMETER (Converted to INCH Decimals)

NOMINAL DIAMETER (mm)MAJOR DIAMETER
mmINCH
M 11.0393
M 1.11.1.0433
M 1.21.2.0472
M 1.41.4.0551
M 1.61.6.0629
M 1.81.8.0708
M 22.0787
M 2.22.2.0866
M 2.32.3.0905
M 2.52.5.0984
M 2.62.6.1023
M 33.1181
M 3.53.5.1378
M 44.1574
M 4.54.5.1771
M 55.1968
M 66.2362
M 77.2755
M 88.3149
M 1010.3937
M 1212.4724
M 1414.5511
M 1616.6299
M 1818.7086
M 2020.7874
M 2222.8661
M 2424.9448
M 27271.0629
M 30301.181
M 33331.299
M 36361.417
M 39391.535
M 42421.654
M 45451.772
M 48481.890
M 52522.047
M 56562.205
M 60602.362
M 64642.520
M 68682.677
M 72722.835
M 76762.992
M 80803.150
M 85853.346
M 90903.543
M 95953.740
M 1001003.937
M 1051054.134
M 1101104.331
M 1151154.538
M 1201204.724
M 1251254.921
M 1301305.118
M 1351355.315
M 1401405.512
M 1451455.709
M 1501505.906

THREAD PITCH (Converted to Number of Threads per Inch)

PITCH (mm)Approx. Threads per Inch
0.08317.5
0.09282.25
0.1254
0.125203.25
0.15169.25
0.175145.25
0.2127
0.225113
0.25101.5
0.384.75
0.3572.5
0.463.5
0.4556.5
0.550.75
0.642.25
0.736.25
0.7533.75
0.831.75
0.925.25
125.5
1.2520.25
1.517
1.7514.25
212.75
2.510.25
38.5
3.57.25
46.25
55
5.54.5
64.25

*All information is strictly informative