Thread Geometry- Unified Fine (UNF)

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
0 0.0600 80 0.0519 0.0451 0.0465
1 0.0730 72 0.0640 0.0565 0.0580
2 0.0860 64 0.0759 0.0674 0.0691
3 0.0990 56 0.0874 0.0778 0.0797
4 0.1120 48 0.0985 0.0871 0.0894
5 0.1250 44 0.1102 0.0979 0.1004
6 0.1380 40 0.1218 0.1082 0.1109
8 0.1640 36 0.1460 0.1309 0.1339
10 0.1900 32 0.1697 0.1528 0.1562
12 0.2160 28 0.1928 0.1734 0.1773

 

Thread Major Diameter Thread per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
1/4 0.2500 28 0.2268 0.2074 0.2113
5/16 0.3125 24 0.2854 0.2629 0.2674
3/8 0.3750 24 0.3479 0.3254 0.3299
7/16 0.4375 20 0.4050 0.3780 0.3834
1/2 0.5000 20 0.4675 0.4405 0.4459
9/16 0.5625 18 0.5264 0.4964 0.5024
5/8 0.6250 18 0.5889 0.5589 0.5649
3/4 0.7500 16 0.7094 0.6763 0.6823
7/8 0.8750 14 0.8286 0.7900 0.7977
1 1.0000 12 0.9459 0.9001 0.9098

 

Thread Major Diameter Thread per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
1 1/8 1.1250 12 1.0709 1.0258 1.0348
1 1/4 1.2500 12 1.1959 1.1508 1.1598
1 3/8 1.3750 12 1.3209 1.2758 1.2848
1 1/2 1.5000 12 1.4459 1.4008 1.4098


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.