ASME B1.529° flank

ACME Threads

The inch power thread — the inch counterpart of the trapezoidal form. Found on vice screws, lead screws and valve stems, usually in a matching nut rather than with a standard fastener. 10 designations are listed here, all quoted in inches.

Dimensions

in
DesignationTPIMajor (in)Pitch Ø (in)Minor ext (in)Tap drill (in)
1/4-16 ACME160.250.21890.16730.1874
5/16-14 ACME140.31260.27680.22130.2409
3/8-12 ACME120.37480.33350.27170.2917
1/2-10 ACME100.50.450.37990.4
5/8-8 ACME80.62520.56260.47990.5
3/4-6 ACME60.750.66650.56340.5835
1-5 ACME510.90.77990.8
1-1/4-5 ACME51.251.151.02991.05
1-1/2-4 ACME41.51.37481.22991.25
2-4 ACME421.87481.72991.75

Other thread systems