Heavy Hex Nuts (ASTM A563)
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.
Hot Dip Galvanized nuts will be tapped oversize prior to coating to allow for the thickness of the bolts coating.
DETAILS
|
Nominal Size
|
Width Across Flats
|
Width Across Corners
|
Thickness
|
|
Basic
|
Max
|
Min
|
Max
|
Min
|
Basic
|
Max
|
Min
|
|
3/8
|
11/16
|
0.688
|
0.669
|
0.794
|
0.763
|
23/64
|
0.377
|
0.341
|
|
1/2
|
7/8
|
0.875
|
0.85
|
1.01
|
0.969
|
31/64
|
0.504
|
0.464
|
|
5/8
|
1 1/16
|
1.062
|
1.031
|
1.227
|
1.175
|
39/64
|
0.631
|
0.587
|
|
3/4
|
1 1/4
|
1.25
|
1.212
|
1.443
|
1.382
|
47/64
|
0.758
|
0.71
|
|
7/8
|
1 7/16
|
1.438
|
1.394
|
1.66
|
1.589
|
55/64
|
0.885
|
0.833
|
|
1
|
1 5/8
|
1.625
|
1.575
|
1.876
|
1.796
|
63/64
|
1.012
|
0.956
|
|
1 1/8
|
1 13/16
|
1.812
|
1.756
|
2.093
|
2.002
|
1 7/64
|
1.139
|
1.079
|
|
1 1/4
|
2
|
2
|
1.938
|
2.309
|
2.209
|
1 7/32
|
1.251
|
1.187
|
|
1 3/8
|
2 3/16
|
2.188
|
2.119
|
2.526
|
2.416
|
1 11/32
|
1.378
|
1.31
|
|
1 1/2
|
2 3/8
|
2.375
|
2.3
|
2.742
|
2.622
|
1 15/32
|
1.505
|
1.433
|
|
1 5/8
|
2 9/16
|
2.562
|
2.481
|
2.959
|
2.828
|
1 19/32
|
1.632
|
1.556
|
|
1 3/4
|
2 3/4
|
2.75
|
2.662
|
3.175
|
3.035
|
1 23/32
|
1.759
|
1.679
|
|
1 7/8
|
2 15/16
|
2.938
|
2.844
|
3.392
|
3.242
|
1 27/32
|
1.886
|
1.802
|
|
2
|
3 1/8
|
3.125
|
3.025
|
3.608
|
3.449
|
2
|
2.013
|
1.925
|
|
2 1/4
|
3 1/2
|
3.5
|
3.388
|
4.041
|
3.862
|
2 13/64
|
2.251
|
2.155
|
|
2 1/2
|
3 7/8
|
3.875
|
3.75
|
4.474
|
4.275
|
2 29/64
|
2.505
|
2.401
|
|
2 3/4
|
4 1/4
|
4.25
|
4.112
|
4.907
|
4.688
|
2 45/64
|
2.759
|
2.647
|
|
3
|
4 5/8
|
4.625
|
4.475
|
5.34
|
5.102
|
2 61/64
|
3.013
|
2.893
|
|
3 1/4
|
5
|
5
|
4.838
|
5.774
|
5.515
|
3 3/16
|
3.252
|
3.124
|
|
3 1/2
|
5 3/8
|
5.375
|
5.2
|
6.207
|
5.928
|
3 7/16
|
3.506
|
3.37
|
|
3 3/4
|
5 3/4
|
5.75
|
5.562
|
6.64
|
6.341
|
3 11/16
|
3.76
|
3.616
|
|
4
|
6 1/8
|
6.125
|
5.925
|
7.073
|
6.755
|
3 15/16
|
4.014
|
3.862
|
|
|
|
|
|
|
|
|
|
|
Dimensions per ASME B18.2.2 1987 (1999)
|
