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

Heavy Hex Nuts
SIZE Width
Across Flats
Width
Across Corners
F C
Basic Max Min Max Min
1/2 7/8 0.875 0.850 1.010 0.969
5/8 1.1/16 1.062 1.031 1.227 1.175
3/4 1.1/4 1.250 1.212 1.443 1.382
7/8 1.7/16 1.438 1.394 1.660 1.589
1 1.5/8 1.625 1.575 1.876 1.796
1.1/8 1.13/16 1.812 1.756 2.093 2.002
1.1/4 2 2.000 1.938 2.309 2.209
1.3/8 2.3/16 2.188 2.119 2.526 2.416
1.1/2 2.3/8 2.375 2.300 2.742 2.622
1.5/8 2.9/16 2.562 2.481 2.959 2.828
1.3/4 2.3/4 2.750 2.662 3.175 3.035
1.7/8 2.15/16 2.938 2.844 3.392 3.242
2 3.1/8 3.125 3.025 3.608 3.449
2.1/4 3.1/2 3.500 3.388 4.041 3.862
2.1/2 3.7/8 3.875 3.750 4.474 4.275
2.3/4 4.1/4 4.250 4.112 4.907 4.688
3 4.5/8 4.625 4.475 5.340 5.102
3.1/4 5 5.000 4.838 5.774 5.515
3.1/2 5.3/8 5.375 5.200 6.207 5.928
3.3/4 5.3/4 5.750 5.562 6.640 6.341
4 6.1/8 6.125 5.925 7.073 6.755
Heavy Hex Nuts
SIZE Thickness Nuts
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.

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