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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
#6 (0.138)*   0.1380 0.1177 0.1008 0.1042 0.00745 0.00909
#8 (0.164)*   0.1640 0.1437 0.1268 0.1302 0.01196 0.0140
#10 (0.190)   0.1900 0.1697 0.1528 0.1562 0.01750 0.0200
  #12 (0.216)* 0.2160 0.1957 0.1788 0.1822 0.0242 0.0270
1/4*   0.2500 0.2297 0.2128 0.2162 0.0344 0.0379
5/16*   0.3125 0.2922 0.2753 0.2787 0.0581 0.0625
3/8*   0.3750 0.3547 0.3378 0.3412 0.0878 0.0932
7/16   0.4375 0.4172 0.4003 0.4037 0.1237 0.1301
1/2   0.5000 0.4797 0.4628 0.4662 0.166 0.173
9/16   0.5625 0.5422 0.5253 0.5287 0.214 0.222
5/8   0.6250 0.6047 0.5878 0.5912 0.268 0.278
  11/16 0.6875 0.6672 0.6503 0.6537 0.329 0.339
3/4   0.7500 0.7297 0.7128 0.7162 0.395 0.407
  13/16 0.8125 0.7922 0.7753 0.7787 0.468 0.480
7/8   0.8750 0.8547 0.8378 0.8412 0.547 0.560
  15/16 0.9375 0.9172 0.9003 0.9037 0.632 0.646
1   1.0000 0.9797 0.9628 0.9662 0.723 0.738
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 UNC, UNF or UNEF series