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SQUARE NUT DIMENSIONS TABLE
Dimensions of square nuts according to ASME B18.2.2. All dimensions are given in inches.
Nominal
Size
Basic
Major
Diameter
of
Thread
F
G
H
Width
Across
Flats
Width
Across
Corners
Thickness
Basic
min
max.
min.
max.
Basic
min.
max.
1/4
0.2500
7/16
0.425
0.438
0.554
0.619
7/32
0.203
0.235
5/16
0.3125
9/16
0.547
0.562
0.721
0.795
17/64
0.249
0.283
3/8
0.3750
5/8
0.606
0.625
0.802
0.884
21/64
0.310
0.346
7/16
0.4375
3/4
0.728
0.750
0.970
1.061
3/8
0.356
0.394
1/2
0.5000
13/16
0.788
0.812
1.052
1.149
7/16
0.418
0.458
5/8
0.6250
1
0.969
1.000
1.300
1.414
35/64
0.525
0.569
3/4
0.7500
1 1/8
1.088
1.125
1.464
1.591
21/32
0.632
0.680
7/8
0.8750
1 5/16
1.269
1.312
1.712
1.856
49/64
0.740
0.792
1
1.0000
1 1/2
1.450
1.500
1.961
2.121
7/8
0.847
0.903
1 1/8
1.1250
1 11/16
1.631
1.688
2.209
2.386
1
0.970
1.030
1 1/4
1.2500
1 7/8
1.812
1.875
2.458
2.652
1 3/32
1.062
1.126
1 3/8
1.3750
2 1/16
1.994
2.062
2.708
2.917
1 13/64
1.169
1.237
1 1/2
1.5000
2 1/4
2.175
2.250
2.956
3.182
1 5/16
1.276
1.348
Supplements:
Nut Dimensions (Inch and Metric)
Hex nut dimensions calculator
Reference:
Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) .
Machinery's Handbook
. 30th edition. Industrial Press Inc.
ASME B18.2.2-2010, Square and Hex Nuts (Inch Series)