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Alma Bolt Company & Prime Fasteners 1-800-526-2200

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Heavy Hex Nuts Dimensions & Specifications

Nominal or Basic Major Diameter of Thread
F
G
H
Width Across Flats
Width Across Corners
Thickness
Basic
Max
Min
Max
Min
Basic
Max
Min
1/4
0.2500
1/2
0.500
0.488
0.577
0.556
15/64
0.250
0.218
5/16
0.3125
9/16
0.562
0.546
0.650
0.622
19/64
0.314
0.280
3/8
0.3750
11/16
0.688
0.669
0.794
0.763
23/64
0.377
0.341
7/16
0.4375
3/4
0.750
0.728
0.866
0.830
27/64
0.441
0.403
1/2
0.5000
7/8
0.875
0.850
1.010
0.969
31/64
0.504
0.464
9/16
0.5625
15/16
0.938
0.909
1.083
1.037
35/64
0.568
0.526
5/8
0.6250
1 1/16
1.062
1.031
1.227
1.175
39/64
0.631
0.587
3/4
0.7500
1 1/4
1.250
1.212
1.443
1.382
47/64
0.758
0.710
7/8
0.8750
1 7/16
1.438
1.394
1.660
1.589
55/64
0.885
0.833
1
1.0000
1 5/8
1.625
1.575
1.876
1.796
63/64
1.012
0.956
1 1/8
1.1250
1 13/16
1.812
1.756
2.093
2.002
1 7/64
1.139
1.079
1 1/4
1.2500
2
2.000
1.938
2.309
2.209
1 7/32
1.251
1.187
1 3/8
1.3750
2 3/16
2.188
2.119
2.526
2.416
1 11/32
1.378
1.310
1 1/2
1.5000
2 3/8
2.375
2.300
2.742
2.622
1 15/32
1.505
1.433
1 5/8
1.6250
2 9/16
2.562
2.481
2.959
2.828
1 19/32
1.632
1.556
1 3/4
1.7500
2 3/4
2.750
2.662
3.175
3.035
1 23/32
1.759
1.679
2
2.0000
3 1/8
3.125
3.025
3.608
3.449
2
2.013
1.925
2 1/4
2.2500
3 1/2
3.500
3.388
4.041
3.862
2 13/64
2.251
2.155
2 1/2
2.5000
3 7/8
3.875
3.750
4.474
4.275
2 29/64
2.505
2.401
2 3/4
2.7500
4 1/4
4.250
4.112
4.907
4.688
2 45/64
2.759
2.647
3
3.0000
4 5/8
4.625
4.475
5.340
5.102
2-61/64
3.013
2.893
3 1/4
3.2500
5
5.000
4.838
5.774
5.515
3 3/16
3.252
3.124
3 1/2
3.5000
5 3/8
5.375
5.200
6.207
5.928
3 7/16
3.506
3.370
3 3/4
3.7500
5 3/4
5.750
5.562
6.640
6.341
3 11/16
3.760
3.616
4
4.0000
6 1/4
6.125
5.925
7.073
6.755
3 15/16
4.014
3.862
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