UNF

Unified Fine Thread, Standardised in 1918, Angle of Thread 60°.

UNF
SizeTapping Drill mmPitch mmTPIOD mm
2-64 UNF1.900.40642.18
3-56 UNF2.150.45562.51
4-48 UNF2.400.53482.84
6-40 UNF2.950.64403.51
8-36 UNF3.550.71364.17
10-32 UNF4.100.79324.83
12-28 UNF4.650.91285.49
1/4-28 UNF5.500.91286.35
5/16-24 UNF6.901.06247.94
3/8-24 UNF8.501.06249.53
7/16-20 UNF9.901.272011.11
1/2-20 UNF11.401.272012.70
9/16-18 UNF12.901.411814.29
5/8-18 UNF14.501.411815.88
3/4-16 UNF17.461.591619.05
7/8-14 UNF20.421.811422.23
1-12 UNF23.252.121225.40

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

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Subjects: Mechanical Engineering