Thread Geometry- Unified Coarse (UNC)

All Dimensions in inches unless otherwise stated
 

Unified Thread Geometry

d1 - Minor thread diameter male

d2 - Minor Thread diameter female

d3 - Pitch diameter

d4 - Major diameter

 

Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
1 0.0730 64 0.0629 0.0544 0.0561
2 0.0860 56 0.0744 0.0648 0.0667
3 0.0990 48 0.0855 0.0741 0.0764
4 0.1120 40 0.0958 0.0822 0.0849
5 0.1250 40 0.1088 0.0952 0.0979
6 0.1380 32 0.1177 0.1008 0.1042
7 0.1640 32 0.1437 0.1268 0.1302
10 0.1900 24 0.1629 0.1404 0.1449
12 0.2160 24 0.1889 0.1664 0.1709
1/4 0.2500 20 0.2175 0.1905 0.1959

 

Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
5/16 0.3125 18 0.2764 0.2464 0.2524
3/8 0.3750 16 0.3344 0.3005 0.3073
7/16 0.4375 14 0.3911 0.3525 0.3602
1/2 0.5000 13 0.4500 0.4084 0.4167
9/16 0.5625 12 0.5084 0.4633 0.4723
5/8 0.6250 11 0.5660 0.5168 0.5266
3/4 0.7500 10 0.6850 0.6309 0.6417
7/8 0.8750 9 0.8028 0.7427 0.7547
1 1.0000 8 0.9188 0.8512 0.8647
1-1/8 1.1250 7 1.0322 0.9549 0.9704

 

Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
1 1/4 1.2500 7 1.1572 1.0799 1.0954
1-3/8 1.3750 6 1.2667 1.1766 1.1946
1 1/2 1.5000 6 1.3917 1.3016 1.3196
1 3/4 1.7500 5 1.6201 1.5119 1.5335
2 2.0000 4.5 1.8557 1.7353 1.7594
2 1/4 2.2500 4.5 2.1057 1.9853 2.0094
2 1/2 2.5000 4 2.3376 2.2023 2.2294
2 3/4 2.7500 4 2.5876 2.4523 2.4794
3 3.0000 4 2.8376 2.7023 2.7294
3 1/4 3.2500 4 3.0876 2.9523 2.9794

 

Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
3 1/2 3.5000 4 3.3376 3.2023 3.2294
3 3/4 3.7500 4 3.5876 3.4523 3.4794
4 4.0000 4 3.8376 3.7023 3.7294


Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.