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HILTI Reference Systems
8.3.3 Bolt Thread Data

Basic Dimensions for UNC Coarse Thread Series--ANSI B1.1-1982
Nominal
Size 		Basic Diameter Threads
per
Inch (n)		 Area*
Major
in. (D) 		Minor
in. 		Nominal
in.2 		Minor
in.2 		Tensile Stress
in.2
No. 10 0.1900 0.1449 24 0.0284 0.0145 0.0175
No. 12 0.2160 0.1709 24 0.0366 0.0206 0.0242
1/4 0.2500 0.1959 20 0.0491 0.0269 0.0318
5/16 0.3125 0.2524 18 0.0767 0.0454 0.0524
3/8 0.3750 0.3073 16 0.1104 0.0678 0.0775
7/16 0.4375 0.3602 14 0.1503 0.0933 0.1063
1/2 0.5000 0.4167 13 0.1963 0.1257 0.1419
9/16 0.5625 0.4723 12 0.2485 0.1620 0.1819
5/8 0.6250 0.5266 11 0.3068 0.2017 0.2260
3/4 0.7500 0.6417 10 0.4418 0.3019 0.3345
7/8 0.8750 0.7547 9 0.6013 0.4192 0.4617
1 1.0000 0.8647 8 0.7854 0.5509 0.6057
11/8 1.1250 0.9704 7 0.9940 0.6929 0.7633
11/4 1.2500 1.0954 7 1.2272 0.8896 0.9691


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