Square nuts are typically used in conjunction with square bolts or are commonly used with pole line hardware. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized hex square nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.

Stock

Diameters: 1/2″ – 1″
Origin: Import
Finish: Black and hot-dip galvanized

Dimensions

Click table to show drawingSquare Nut
Nominal Size F C H Part Numbers
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min Black Galvanized
3/8 5/8 0.625 0.606 0.884 0.802 21/64 0.346 0.310 18985 18986
1/2 13/16 0.812 0.788 1.149 1.052 7/16 0.458 0.418 18987 11854
5/8 1 1.000 0.969 1.414 1.300 35/64 0.569 0.525 18988 11856
3/4 1-1/8 1.125 1.088 1.591 1.464 21/32 0.680 0.632 11857 11858
7/8 1-5/16 1.312 1.269 1.856 1.712 49/64 0.792 0.740 11859 11860
1 1-1/2 1.500 1.450 2.121 1.961 7/8 0.903 0.847 11861 11862
1-1/8 1-11/16 1.688 1.631 2.386 2.209 1 1.030 0.970 - -
1-1/4 1-7/8 1.875 1.812 2.652 2.458 1-3/32 1.126 1.062 11863 11864
1-3/8 2-1/16 2.062 1.994 2.917 2.708 1-13/64 1.237 1.169 - -
1-1/2 2-1/4 2.250 2.175 3.182 2.956 1-5/16 1.348 1.276 - -

Dimensions per ASME B18.2.2 1987 (1999)