Specifications of International Thread Standards

The ACME thread was developed as a compromise, to offer better strength than a V-form while overcoming the problems with the square thread form.
The flank angle is 29°.

Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPIPitch
mm
1/4" - 16 ACME0.2506.3504.762161.588
5/16" - 14 ACME0.3137.9386.123141.814
3/8" - 12 ACME0.3759.5257.408122.117
7/16" - 12 ACME0.43711.1128.996122.117
1/2" - 10 ACME0.50012.70010.160102.540
5/8" - 8 ACME0.62515.87512.70083.175
3/4" - 6 ACME0.75019.05014.81764.233
7/8" - 6 ACME0.87522.22517.99264.233
1" - 5 ACME1.00025.40020.32055.080
1 1/8" - 5 ACME1.12528.57523.49555.080
1 1/4" - 5 ACME1.25031.75026.67055.080
1 3/8" - 4 ACME1.37534.92528.57546.350
1 1/2" - 4 ACME1.50038.10031.75046.350
1 3/4" - 4 ACME1.75044.45038.10046.350
2" - 4 ACME2.00050.80044.45046.350
2 1/4" - 3 ACME2.25057.15048.68338.467
2 1/2" - 3 ACME2.50063.50055.03338.467
2 3/4" - 3 ACME2.75069.85061.38338.467
3" - 2 ACME3.00076.20063.500212.700
3 1/2" - 2 ACME3.50088.90076.200212.700
4" - 2 ACME4.000101.60088.900212.700
4 1/2" - 2 ACME4.500114.300101.600212.700
5" - 2 ACME5.000127.000114.300212.700
BORNEMANN Gewindetechnik