1"-8 Zinc Plated Steel Coarse Thread Square Nuts

Diameter: 1"
Thickness: 7/8"
Material: Steel
Finish: Zinc
Driver Type: 1-1/2" Wrench
Thread Size: 8 (Coarse)
Type: Square Nut

Box of 5.

A square nut is a four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening). Square nuts are typically mated with square-headed bolts.