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
Diameter
Inch
Diameter
mm
Tapping Drill Size
mm
TPIPitch
mm
1/4" - 16 STUB ACME0.2506.3505.398161.588
5/16" - 14 STUB ACME0.3127.9386.123141.814
3/8" - 12 STUB ACME0.3759.5258.255122.117
7/16" - 12 STUB ACME0.43711.1129.843122.117
1/2" - 10 STUB ACME0.50012.70011.176102.540
5/8" - 8 STUB ACME0.62515.87513.97083.175
3/4" - 6 STUB ACME0.75019.05016.510122.117
7/8" - 6 STUB ACME0.87522.22519.68564.233
1" - 5 STUB ACME1.00025.40022.35255.080
1 1/8" - 5 STUB ACME1.12528.57525.52755.080
1 1/4" - 5 STUB ACME1.25031.75028.70255.080
1 3/8" - 4 STUB ACME1.37534.92531.11546.350
1 1/2" - 4 STUB ACME1.50038.10034.29046.350
1 3/4" - 4 STUB ACME1.75044.45040.64046.350
2" - 4 STUB ACME2.00050.80046.99046.350
2 1/4" - 3 STUB ACME2.25057.15052.07038.467
2 1/2" - 3 STUB ACME2.50063.50058.42038.467
2 3/4" - 3 STUB ACME2.75069.85064.77038.467
3" - 2 STUB ACME3.00076.20068.580212.700
3 1/2" - 2 STUB ACME3.50088.90081.280212.700
4" - 2 STUB ACME4.000101.60093.980212.700
4 1/2" - 2 STUB ACME4.500114.300106.680212.700
5" - 2 STUB ACME5.000127.000119.380212.700
BORNEMANN Gewindetechnik