SQUARE NUT DIMENSIONS TABLE

Dimensions of square nuts according to ASME B18.2.2. All dimensions are given in inches.

Square Nut Dimensions
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:

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)