Hex Bolts (Inch)

Size [1] [2] Diameter Thread Length Flat Width Head Height
1/4 0.250 0.750 0.438 0.188
5/16 0.313 0.875 0.500 0.235
3/8 0.375 1.000 0.563 0.268
7/16 0.438 1.125 0.625 0.316
1/2 0.500 1.250 0.750 0.364
5/8 0.625 1.500 0.938 0.444
3/4 0.750 1.750 1.125 0.524
7/8 0.875 2.000 1.313 0.604
1 1.000 2.250 1.500 0.700
1 1/8 1.125 2.500 1.688 0.780
1 1/4 1.250 2.750 1.875 0.876
1 3/8 1.375 3.000 2.063 0.940
1 1/2 1.500 3.250 2.250 1.036
1 3/4 1.750 3.750 2.625 1.196
2 2.000 4.250 3.000 1.388
2 1/4 2.250 4.750 3.375 1.548
2 1/2 2.500 5.250 3.750 1.708
2 3/4 2.750 5.750 4.125 1.869
3 3.000 6.250 4.500 2.060
3 1/4 3.250 6.750 4.875 2.251
3 1/2 3.500 7.250 5.250 2.380
3 3/4 3.750 7.750 5.625 2.572
4 4.000 8.250 6.000 2.764

  1. Dimensions per ASME B18.2.1-1996 in inches. ↩︎

  2. Oberg, Jones, Horton, Ryffel, McCauley. (2020). Machinery’s Handbook 31 Digital Edition. Industrial Press eBookstore ↩︎