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US Hex Bolts - Inches

ANSI/ASME B18.2.1 Dimensions of Hex Bolts - Imperial units.

hex bolt

US Hex Bolts - Inches
Nominal Size
(in)
Outside Diameter (in) Width Across Flats
(in)
maxmin
5/16 0.324 0.298 1/2
3/8 0.388 0.360 9/16
7/16 0.452 0.421 5/8
1/2 0.515 0.482 3/4
5/8 0.642 0.605 15/16
3/4 0.768 0.729 1 1/8
7/8 0.895 0.852 1 5/16
1 1.022 0.976 1 1/2
1 1/8 1.149 1.098 1 11/16
1 1/4 1.277 1.223 1 7/8
1 3/8 1.404 1.345 2 1/16
1 1/2 1.531 1.470 2 1/4
1 5/8 1.658 1.591 2 7/16
1 3/4 1.785 1.716 2 5/8
1 7/8 1.912 1.839 2 13/16
2 2.039 1.964 3
2 1/4 2.305 2.214 3 3/8
2 1/2 2.559 2.461 3 3/4
2 3/4 2.827 2.711 4 1/8
3 3.081 2.961 4 1/2
3 1/4 3.335 3.210 4 7/8
3 1/2 3.589 3.461 5 1/4
3 3/4 3.858 3.726 5 5/8
4 4.111 3.975 6

ASME B18.2.1 Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series)

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