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The ASME B18.31.2 covers three type of inch-dimens...Information restricted to registered users: Login | Register now for a 14 day free trial
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Dimensions in inches (1 inch=25.4 mm) sourceASME B18.31.2 2008 table 2 Clamping type studs

d Thread size

Nr. of threads x inch

B Nut end full thread length. min
inch mm UNC UNF L≤ 10 10< L≤ 16 L> 16
1/4
6.35 20 28 0.75 1 1.5
5/16
7.94 18 24 0.875 1.125 1.625
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4


Dimensions in inches (1 inch=25.4 mm) sourceASME B18.31.2 2008 table 3 Tap end studs (1.5D engagement)

d Thread size
Nr. of threads x inch

Bm Tap end full thread length.

nominal

B Nut end full thread length. min
inch mm UNC UNF L≤ 10 10< L≤ 16 L> 16
1/4
6.35 20 28 0.375 0.75 1 1.5
5/16
7.94 18 24 0.469 0.875 1.125 1.625
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4



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