5/8"-11 x 1-1/16" Zinc Plated Steel Coarse Thread Hex Jam Nuts (5 pcs.)

Diameter: 5/8"
Diameter 2: 1-1/16"
Thickness: 3/8"
Material: Steel
Finish: Zinc
Driver Type: 15/16" Wrench
Thread Size: 11 (Coarse)
Shape: Jam Nut
Type: Jam Nut

Box of 5.

A jam nut is a low profile type of nut, typically half as tall as a standard nut. It is commonly used as a type of locknut, where it is "jammed" up against a standard nut to lock the two in place. It is also used in situations where a standard nut would not fit.