Dimensions of Heavy Hex Nuts ASME B18.2.2 used with Stud Bolts ASME B16.5

SIZE	Thickness
	T
	Basic	Max	Min
1/2	31/64	0.504	0.464	22 mm	22.23 mm
5/8	39/64	0.631	0.587	27 mm	26.99 mm
3/4	47/64	0.758	0.710	32 mm	31.75 mm
7/8	55/64	0.885	0.833	36 mm	36.51 mm
1	63/64	1.012	0.956	41 mm	41.28 mm
1.1/8	1.7/64	1.139	1.079	46 mm	46.04 mm
1.1/4	1.7/32	1.251	1.187	51 mm	50.8 mm
1.3/8	1.11/32	1.378	1.310	56 mm	55.56 mm
1.1/2	1.15/32	1.505	1.433	60 mm	60.33 mm
1.5/8	1.19/32	1.632	1.556	65 mm	65.09 mm
1.3/4	1.23/32	1.759	1.679	70 mm	69.85 mm
1.7/8	1.27/32	1.886	1.802	75 mm	74.61 mm
2	1.31/32	2.013	1.925	79 mm	79.37 mm
2.1/4	2.13/64	2.251	2.155	89 mm	88.9 mm
2.1/2	2.29/64	2.505	2.401	98 mm	98.42 mm
2.3/4	2.45/64	2.759	2.647	108 mm	107.95 mm
3	2.61/64	3.013	2.893	117 mm	117.48 mm
3.1/4	3.3/16	3.252	3.124	127 mm	127 mm
3.1/2	3.7/16	3.506	3.370	137 mm	136.53 mm
3.3/4	3.11/16	3.760	3.616	146 mm	146.05 mm
4	3.15/16	4.014	3.862	156 mm	155.57 mm

Notes..

• All dimensions are given in inches unless otherwise indicated.
• Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.

Important.. the Across Flat sizes in Millimeters shown in the table should be used as a guide only. Individual sizes should be checked before specifying any equipment.