Nominal Size, Inches
F
G
H
H1
Width Across Flats
Width Across Corners
Thickness Hex Nuts
Thickness Hex Jam Nuts
Max
Min
.25
.438
.428
.505
.488
.226
.212
.163
.150
.3125
.500
.489
.577
.557
.273
.258
.195
.180
.375
.562
.551
.650
.628
.337
.320
.227
.210
.4375
.688
.675
.794
.768
.385
.365
.260
.240
.50
.750
.736
.866
.840
.448
.427
.323
.302
.5625
.875
.861
1.010
.982
.496
.473
.324
.301
.625
.938
.922
1.083
1.051
.559
.535
.387
.363
.75
1.125
1.088
1.299
1.240
.665
.617
.446
.398
1.312
1.269
1.516
1.447
.776
.724
.510
.458
1.00
1.500
1.450
1.732
1.653
.887
.831
.575
.519
1.688
1.631
1.949
1.859
.999
.939
.639
.579
1.25
1.875
1.812
2.165
2.066
1.094
1.030
.751
.687
1.375
2.062
1.994
2.382
2.273
1.206
1.138
.815
.747
1.50
2.250
2.175
2.598
2.480
1.317
1.245
.880
.808
