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There are three classes of ACME threads giving varying degrees of free movement. The table below gives the dimensions for tolerance class 2G. Tighter tolerances are defined in classes 3G and 4G

 

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Actions ID Designation Size Tpi Tol Class Major Dia Max Major Dia Min Pitch Dia Max Pitch Dia Min Minor Dia Max Minor Dia Min
1 3/8-12 Acme 0.375 12 2G 0.375 0.370 0.328 0.316 0.282 0.263
2 1/2-10 Acme 0.500 10 2G 0.500 0.495 0.444 0.431 0.380 0.359
3 5/8- 4 Acme 0.625 4 2G STUB 0.625 0.619 0.542 0.524 0.455 0.433
4 5/8-6 Acme 0.625 6 2G 0.625 0.617 0.535 0.517 0.438 0.413
5 5/8-8 Acme 0.625 8 2G 0.625 0.619 0.556 0.541 0.480 0.457
6 5/8- 10 Acme 0.625 10 2G 0.625 0.620 0.569 0.556 0.505 0.484
7 3/4-5 Acme 0.750 5 2G 0.750 0.740 0.642 0.623 0.530 0.501
8 3/4-6 Acme 0.750 6 2G 0.750 0.742 0.660 0.642 0.563 0.537
9 3/4-8 Acme 0.750 8 2G 0.750 0.744 0.681 0.666 0.605 0.582
10 3/4-10 Acme 0.750 10 2G 0.750 0.745 0.693 0.678 0.630 0.608
11 7/8-5 Acme 0.875 5 2G 0.875 0.865 0.767 0.748 0.655 0.626
12 7/8-6 Acme 0.875 6 2G 0.875 0.867 0.784 0.766 0.688 0.662
13 7/8-8 Acme 0.875 7 2G 0.875 0.869 0.806 0.791 0.730 0.707
14 1-4 Acme 0.875 4 2G 1.000 0.988 0.865 0.843 0.730 0.697
15 1-5 Acme 1.000 5 2G 1.000 0.990 0.892 0.873 0.780 0.751
16 1-6 Acme 1.000 6 2G 1.000 0.992 0.910 0.893 0.813 0.787
17 1-8 Acme 1.000 8 2G 1.000 0.994 0.931 0.916 0.855 0.832
18 1-10Acme 1.000 10 2G 1.000 0.995 0.942 0.926 0.880 0.857
19 1 1/8-4 Acme 1.125 4 2G 1.125 1.113 0.990 0.968 0.855 0.822
20 1 1/8-5 Acme 1.125 5 2G 1.125 1.115 1.017 0.997 0.905 0.875
21 1 1/8-6 Acme 1.125 6 2G 1.125 1.117 1.031 1.016 0.938 0.912
22 1 1/4-4 Acme 1.250 4 2G 1.250 1.238 1.115 1.093 0.980 0.947
23 1 1/4-5 Acme 1.250 5 2G 1.250 1.240 1.141 1.121 1.030 1.000
24 1 1/4-6 Acme 1.250 6 2G 1.250 1.242 1.160 1.142 1.063 1.037
25 1 1/4-8 Acme 1.250 8 2G 1.250 1.244 1.179 1.161 1.105 1.079
26 1 3/8-4 Acme 1.375 4 2G 1.375 1.363 1.241 1.219 1.105 1.072
27 1 3/8-5 Acme 1.375 5 2G 1.375 1.365 1.266 1.246 1.155 1.124
28 1 3/8-6 Acme 1.375 6 2G 1.375 1.367 1.285 1.267 1.188 1.162
29 1 1/2-4 Acme 1.500 4 2G 1.500 1.488 1.365 1.343 1.230 1.197
30 1 1/2-5 Acme 1.500 5 2G 1.500 1.490 1.392 1.373 1.280 1.221

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