ASME Unified National Fine (UNF)

All 34 thread sizes per ASME B1.1. Click any row for full specifications, tolerances, and geometry.

DesignationDiameter (in)TPISpecs
#00.0680 TPI
#10.07372 TPI
#20.08664 TPI
#30.09956 TPI
#40.11248 TPI
#50.12544 TPI
#60.13840 TPI
#80.16436 TPI
#100.1932 TPI
#120.21628 TPI
1/4"0.2528 TPI
5/16"0.312524 TPI
3/8"0.37524 TPI
7/16"0.437520 TPI
1/2"0.520 TPI
9/16"0.562518 TPI
5/8"0.62518 TPI
11/16"0.687524 TPI
3/4"0.7516 TPI
13/16"0.812520 TPI
7/8"0.87514 TPI
15/16"0.937520 TPI
1"112 TPI
1 1/16"1.062518 TPI
1 1/8"1.12512 TPI
1 3/16"1.187518 TPI
1 1/4"1.2512 TPI
1 5/16"1.312518 TPI
1 3/8"1.37512 TPI
1 7/16"1.437518 TPI
1 1/2"1.512 TPI
1 9/16"1.562518 TPI
1 5/8"1.62518 TPI
1 11/16"1.687518 TPI

Showing 34 thread sizes • Standards: ASME B1.1