5/8"-18 Zinc Plated Steel Fine Thread Serrated Lock Nuts

Diameter: 5/8"
Diameter 2: 1-9/32"
Thickness: 9/16"
Material: Steel
Finish: Zinc
Driver Type: 15/16" Wrench
Thread Size: 18 (Fine)
Style: Serrated
Type: Flange Nut

Box of 5.

A flange nut has a wide flange at one end that acts as an integrated, non-spinning washer. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface.