Acme Thread New Format
Acme Thread New Format
Acme Thread New Format
IQ External
Major Dia Pitch Dia
Size Thread Custom Thread
Size Suffix Designation Designation TPI Class Max Min Max
0.25 1/4-16 Acme 1/4-16 Acme 16 2G 0.2500 0.2450 0.2148
0.25 1/4-16 Acme 1/4-16 Acme 16 3G 0.2500 0.2450 0.2158
0.25 1/4-16 Acme 1/4-16 Acme 16 4G 0.2500 0.2450 0.2168
0.25 1/4-16 Acme 1/4-16 Acme 16 5G 0.2500 0.2450 0.2188
0.3125 5/16-14 Acme 5/16-14 Acme 14 2G 0.3125 0.3075 0.2728
0.3125 5/16-14 Acme 5/16-14 Acme 14 3G 0.3125 0.3075 0.2738
0.3125 5/16-14 Acme 5/16-14 Acme 14 4G 0.3125 0.3075 0.2748
0.3125 5/16-14 Acme 5/16-14 Acme 14 5G 0.3125 0.3075 0.2768
0.375 3/8-12 Acme 3/8-12 Acme 12 2G 0.3750 0.3700 0.3284
0.375 3/8-12 Acme 3/8-12 Acme 12 3G 0.3750 0.3700 0.3296
0.375 3/8-12 Acme 3/8-12 Acme 12 4G 0.3750 0.3700 0.3309
0.375 3/8-12 Acme 3/8-12 Acme 12 5G 0.3750 0.3700 0.3333
0.4375 7/16-12 Acme 7/16-12 Acme 12 2G 0.4375 0.4325 0.3909
0.4375 7/16-12 Acme 7/16-12 Acme 12 3G 0.4375 0.4325 0.3921
0.4375 7/16-12 Acme 7/16-12 Acme 12 4G 0.4375 0.4325 0.3934
0.4375 7/16-12 Acme 7/16-12 Acme 12 5G 0.4375 0.4325 0.3958
0.5 1/2-10 Acme 1/2-10 Acme 10 2G 0.5000 0.4950 0.4443
0.5 1/2-10 Acme 1/2-10 Acme 10 3G 0.5000 0.4950 0.4458
0.5 1/2-10 Acme 1/2-10 Acme 10 4G 0.5000 0.4950 0.4472
0.5 1/2-10 Acme 1/2-10 Acme 10 5G 0.5000 0.4950 0.45
0.625 5/8-8 Acme 5/8-8 Acme 8 2G 0.6250 0.6188 0.5562
0.625 5/8-8 Acme 5/8-8 Acme 8 3G 0.6250 0.6188 0.5578
0.625 5/8-8 Acme 5/8-8 Acme 8 4G 0.6250 0.6188 0.5593
0.625 5/8-8 Acme 5/8-8 Acme 8 5G 0.6250 0.6188 0.5625
0.75 3/4-6 Acme 3/4-6 Acme 6 2G 0.7500 0.7417 0.6598
0.75 3/4-6 Acme 3/4-6 Acme 6 3G 0.7500 0.7417 0.6615
0.75 3/4-6 Acme 3/4-6 Acme 6 4G 0.7500 0.7417 0.6632
0.75 3/4-6 Acme 3/4-6 Acme 6 5G 0.7500 0.7417 0.6667
0.875 7/8-6 Acme 7/8-6 Acme 6 2G 0.8750 0.8667 0.7842
0.875 7/8-6 Acme 7/8-6 Acme 6 3G 0.8750 0.8667 0.7861
0.875 7/8-6 Acme 7/8-6 Acme 6 4G 0.8750 0.8667 0.788
0.875 7/8-6 Acme 7/8-6 Acme 6 5G 0.8750 0.8667 0.7917
1 1-5 Acme 1-5 Acme 5 2G 1.0000 0.9900 0.892
1 1-5 Acme 1-5 Acme 5 3G 1.0000 0.9900 0.894
1 1-5 Acme 1-5 Acme 5 4G 1.0000 0.9900 0.896
1 1-5 Acme 1-5 Acme 5 5G 1.0000 0.9900 0.9
1.125 1 1/8-5 Acme 1 1/8-5 Acme 5 2G 1.1250 1.1150 1.0165
1.125 2 1/8-5 Acme 2 1/8-5 Acme 5 3G 1.1250 1.1150 1.0186
1.125 3 1/8-5 Acme 3 1/8-5 Acme 5 4G 1.1250 1.1150 1.0208
1.125 4 1/8-5 Acme 4 1/8-5 Acme 5 5G 1.1250 1.1150 1.025
1.25 1 1/4-5 Acme 1 1/4-5 Acme 5 2G 1.2500 1.2400 1.1411
1.25 2 1/4-5 Acme 2 1/4-5 Acme 5 3G 1.2500 1.2400 1.1433
1.25 3 1/4-5 Acme 3 1/4-5 Acme 5 4G 1.2500 1.2400 1.1455
1.25 4 1/4-5 Acme 4 1/4-5 Acme 4 5G 1.2500 1.2400 1.15
1.375 1 3/8-4 Acme 1 3/8-4 Acme 4 2G 1.3750 1.3625 1.2406
1.375 2 3/8-4 Acme 2 3/8-4 Acme 4 3G 1.3750 1.3625 1.243
1.375 3 3/8-4 Acme 3 3/8-4 Acme 4 4G 1.3750 1.3625 1.2453
1.375 4 3/8-4 Acme 4 3/8-4 Acme 4 5G 1.3750 1.3625 1.25
1.5 1 1/2-4 Acme 1 1/2-4 Acme 4 2G 1.5000 1.4875 1.3652
1.5 2 1/2-4 Acme 2 1/2-4 Acme 4 3G 1.5000 1.4875 1.3677
1.5 3 1/2-4 Acme 3 1/2-4 Acme 4 4G 1.5000 1.4875 1.3701
1.5 4 1/2-4 Acme 4 1/2-4 Acme 4 5G 1.5000 1.4875 1.375
1.75 1 3/4-4 Acme 1 3/4-4 Acme 4 2G 1.7500 1.7375 1.6145
1.75 2 3/4-4 Acme 2 3/4-4 Acme 4 3G 1.7500 1.7375 1.6171
1.75 3 3/4-4 Acme 3 3/4-4 Acme 4 4G 1.7500 1.7375 1.6198
1.75 4 3/4-4 Acme 4 3/4-4 Acme 4 5G 1.7500 1.7375 1.625
2 2-4 Acme 2-4 Acme 4 2G 2.0000 1.9875 1.8637
2 2-4 Acme 2-4 Acme 4 3G 2.0000 1.9875 1.8665
2 2-4 Acme 2-4 Acme 4 4G 2.0000 1.9875 1.8693
2 2-4 Acme 2-4 Acme 4 5G 2.0000 1.9875 1.875
2.25 2 1/4-3 Acme 2 1/4-3 Acme 3 2G 2.2500 2.2333 2.0713
2.25 3 1/4-3 Acme 3 1/4-3 Acme 3 3G 2.2500 2.2333 2.0743
2.25 4 1/4-3 Acme 4 1/4-3 Acme 3 4G 2.2500 2.2333 2.0773
2.25 5 1/4-3 Acme 5 1/4-3 Acme 3 5G 2.2500 2.2333 2.0833
2.5 2 1/2-3 Acme 2 1/2-3 Acme 3 2G 2.5000 2.4833 2.3207
2.5 3 1/2-3 Acme 3 1/2-3 Acme 3 3G 2.5000 2.4833 2.3238
2.5 4 1/2-3 Acme 4 1/2-3 Acme 3 4G 2.5000 2.4833 2.327
2.5 5 1/2-3 Acme 5 1/2-3 Acme 3 5G 2.5000 2.4833 2.333
2.75 2 3/4-3 Acme 2 3/4-3 Acme 3 2G 2.7500 2.7333 2.57
2.75 3 3/4-3 Acme 3 3/4-3 Acme 3 3G 2.7500 2.7333 2.5734
2.75 4 3/4-3 Acme 4 3/4-3 Acme 3 4G 2.7500 2.7333 2.5767
2.75 5 3/4-3 Acme 5 3/4-3 Acme 3 5G 2.7500 2.7333 2.5833
3 3-2 Acme 3-2 Acme 2 2G 3.0000 2.9750 2.736
3 3-2 Acme 3-2 Acme 2 3G 3.0000 2.9750 2.7395
3 3-2 Acme 3-2 Acme 2 4G 3.0000 2.9750 2.743
3 3-2 Acme 3-2 Acme 2 5G 3.0000 2.9750 2.75
3.5 3 1/2-2 Acme 3 1/2-2 Acme 2 2G 3.5000 3.4750 3.235
3.5 4 1/2-2 Acme 4 1/2-2 Acme 2 3G 3.5000 3.4750 3.2388
3.5 5 1/2-2 Acme 5 1/2-2 Acme 2 4G 3.5000 3.4750 3.2425
3.5 6 1/2-2 Acme 6 1/2-2 Acme 2 5G 3.5000 3.4750 3.25
4 4-2 Acme 4-2 Acme 2 2G 4.0000 3.9750 3.734
4 4-2 Acme 4-2 Acme 2 3G 4.0000 3.9750 3.738
4 4-2 Acme 4-2 Acme 2 4G 4.0000 3.9750 3.742
4 4-2 Acme 4-2 Acme 2 5G 4.0000 3.9750 3.75
4.5 4 1/2-2 Acme 4 1/2-2 Acme 2 2G 4.5000 4.4750 4.233
4.5 5 1/2-2 Acme 5 1/2-2 Acme 2 3G 4.5000 4.4750 4.2373
4.5 6 1/2-2 Acme 6 1/2-2 Acme 2 4G 4.5000 4.4750 4.2415
4.5 7 1/2-2 Acme 7 1/2-2 Acme 2 5G 4.5000 4.4750 4.25
5 5-2 Acme 5-2 Acme 2 2G 5.0000 4.9750 4.7319
5 5-2 Acme 5-2 Acme 2 3G 5.0000 4.9750 4.7364
5 5-2 Acme 5-2 Acme 2 4G 5.0000 4.9750 4.7409
5 5-2 Acme 5-2 Acme 2 5G 5.0000 4.9750 4.75
External Internal
Pitch Dia Minor Dia Minor Dia Pitch Dia