UNC

Unified National Coarse thread, Standardised in 1918. Derived from British Standard Whitworth and has the same thread angle of 60°.

UNC
SizeTapping Drill mmPitch mmTPIOD mm
2-56 UNC1.850.45562.18
3-48 UNC2.100.53482.51
4-40 UNC2.350.64402.84
6-32 UNC2.840.79323.51
8-32 UNC3.500.79324.17
10-24 UNC3.901.06244.83
12-24 UNC4.551.06245.49
1/4-20 UNC5.301.27206.35
5/16-18 UNC6.601.41187.94
3/8-16 UNC8.001.59169.53
7/16-14 UNC9.401.811411.11
1/2-13 UNC10.801.951312.70
9/16-12 UNC12.252.121214.29
5/8-11 UNC13.502.311115.88
3/4-10 UNC16.502.541019.05
7/8-9 UNC19.452.82922.23
1-8 UNC22.253.18825.40

See also: British Association Threads, British Standard Whitworth, Thread, UNF.

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Subjects: Mechanical Engineering