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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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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 0.38 12 2G 0.38 0.37 0.33 0.32 0.28 0.26
2 1/2-10 Acme 0.50 10 2G 0.50 0.50 0.44 0.43 0.38 0.36
3 5/8- 4 Acme 0.63 4 2G STUB 0.63 0.62 0.54 0.52 0.46 0.43
4 5/8-6 Acme 0.63 6 2G 0.63 0.62 0.53 0.52 0.44 0.41
5 5/8-8 Acme 0.63 8 2G 0.63 0.62 0.56 0.54 0.48 0.46
6 5/8- 10 Acme 0.63 10 2G 0.63 0.62 0.57 0.56 0.51 0.48
7 3/4-5 Acme 0.75 5 2G 0.75 0.74 0.64 0.62 0.53 0.50
8 3/4-6 Acme 0.75 6 2G 0.75 0.74 0.66 0.64 0.56 0.54
9 3/4-8 Acme 0.75 8 2G 0.75 0.74 0.68 0.67 0.61 0.58
10 3/4-10 Acme 0.75 10 2G 0.75 0.75 0.69 0.68 0.63 0.61
11 7/8-5 Acme 0.88 5 2G 0.88 0.87 0.77 0.75 0.66 0.63
12 7/8-6 Acme 0.88 6 2G 0.88 0.87 0.78 0.77 0.69 0.66
13 7/8-8 Acme 0.88 7 2G 0.88 0.87 0.81 0.79 0.73 0.71
14 1-4 Acme 0.88 4 2G 1.00 0.99 0.87 0.84 0.73 0.70
15 1-5 Acme 1.00 5 2G 1.00 0.99 0.89 0.87 0.78 0.75

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