Thread Geometry- Unified Extra Fine (UNEF)

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
No 12 0.2160 32 0.1957 0.1788 0.1822
1/4 0.2500 32 0.2297 0.2128 0.2162
5/16 0.3125 32 0.2922 0.2753 0.2787
3/8 0.3750 32 0.3547 0.3378 0.3412
7/16 0.4375 28 0.4143 0.3949 0.3988
1/2 0.5000 28 0.4768 0.4574 0.4613
9/16 0.5625 24 0.5354 0.5129 0.5174
5/8 0.6250 24 0.5979 0.5754 0.5799
11/16 0.6875 24 0.6604 0.6379 0.6424
3/4 0.7500 20 0.7175 0.6905 0.6959

 

Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
13/16 0.8125 20 0.7800 0.7530 0.7584
7/8 0.8750 20 0.8425 0.8155 0.8209
15/16 0.9375 20 0.9050 0.8780 0.8834
1 1.0000 20 0.9675 0.9405 0.9459
1 1/16 1.0625 18 1.0264 0.9964 1.0024
1 1/8 1.1250 18 1.0889 1.0589 1.0649
1 3/16 1.1875 18 1.1514 1.1214 1.1274
1 1/4 1.2500 18 1.2139 1.1839 1.1899
1 5/16 1.3125 18 1.2764 1.2464 1.2524
1 3/8 1.3750 18 1.3389 1.3089 1.3149

 

Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread
1 7/16 1.4375 18 1.4014 1.3714 1.3774
1 1/2 1.5000 18 1.4639 1.4339 1.4399
1 9/16 1.5625 18 1.5264 1.4964 1.5024
1 5/8 1.6250 18 1.5889 1.5589 1.5649
1 11/16 1.6875 18 1.6514 1.6214 1.6274


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.