Mechanical Screw Data

Coarse Threads  FineThreads

This page provides data on typical mechanical screw/thread sizes.

Coarse Screw Threads

SizeThreads / inchMajor Diameter (in.)Minor Diameter (in.)Lead Angle (Deg.)Lead Angle (Min.)
1640.0730.056431
2560.0860.067422
3480.0990.076426
4400.1120.085445
5400.1250.098411
6320.1380.101450
8320.1640.13358
10240.190.145439
12240.2160.17141
1/4200.250.196411
5/16180.3130.252340
3/8160.3750.307324
7/16140.4380.36320
1/2130.50.41737
9/16120.5630.472259
5/8110.6250.527256
3/4100.750.642240
7/890.8750.755231
1810.865229

 

Fine Screw Threads

SizeThreads / inchMajor Diameter (in.)Minor Diameter (in.)Lead Angle (Deg.)Lead Angle (Min.)
0800.060.465423
1720.0730.058357
2640.0860.069345
3560.0990.08343
4480.1120.089351
5440.1250.1345
6400.1380.111344
8360.1640.134328
10320.190.156321
12280.2160.177322
1/4280.250.211252
5/16240.3130.267240
3/8240.3750.33211
7/16200.4380.338215
1/2200.50.446157
9/16180.5630.502155
5/8180.6250.565143
3/4160.750.682136
7/8140.8750.798134
11210.91136

 


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