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Size Basic Major Diameter Basic Pitch Diameter Minor Diameter Minor Dia. Area Tensile Stress Area
Size Primary Size Secondary External Thread Internal Thread
inch inch inch inch inch inch sq. inch sq. inch
  #12 (0.216)* 0.2160 0.1928 0.1734 0.1773 0.0226 0.0258
1/4*   0.2500 0.2268 0.2074 0.2113 0.0326 0.0364
5/16   0.3125 0.2893 0.2699 0.2738 0.0556 0.0606
3/8   0.3750 0.3518 0.3324 0.3363 0.0848 0.0909
7/16*   0.4375 0.4143 0.3949 0.3988 0.1201 0.1274
1/2*   0.5000 0.4768 0.4574 0.4613 0.162 0.170
9/16   0.5625 0.5393 0.5199 0.5238 0.209 0.219
5/8   0.6250 0.6018 0.5824 0.5863 0.263 0.274
  11/16 0.6875 0.6643 0.6449 0.6488 0.323 0.335
3/4   0.7500 0.7268 0.7074 0.7113 0.389 0.402
  13/16 0.8125 0.7893 0.7699 0.7738 0.461 0.475
7/8   0.8750 0.8518 0.8324 0.8363 0.539 0.554
  15/16 0.9375 0.9143 0.8949 0.8988 0.624 0.640
1   1.0000 0.9768 0.9574 0.9613 0.714 0.732
  11/16 1.0625 1.0393 1.0199 1.0238 0.811 0.830
11/8   1.1250 1.1018 1.0824 1.0863 0.914 0.933
  13/16 1.1875 1.1643 1.1449 1.1488 1.023 1.044
11/4   1.2500 1.2268 1.2074 1.2113 1.138 1.160
  15/16 1.3125 1.2893 1.2699 1.2738 1.259 1.282
13/8   1.3750 1.3518 1.3324 1.3363 1.386 1.411
  17/16 1.4375 1.4143 1.3949 1.3988 1.52 1.55
11/2   1.5000 1.4768 1.4574 1.4613 1.66 1.69
inch inch inch inch inch inch sq. inch sq. inch
Size Primary Size Secondary Basic Major Diameter Basic Pitch Diameter External Thread Internal Thread Minor Dia. Area Tensile Stress Area
Size Minor Diameter
* Standard Sizes of the UNF or UNEF series