1"-8 Zinc Plated Grade 2 Nylon Insert Lock Nuts LNS-404 (10 pcs)

Diameter: 1"
Diameter 2: 1-21/32"
Thickness: 1-1/16"
Material: Steel
Finish: Zinc
Driver Type: 1-7/16" Wrench
Thread Size: 8 (Coarse)
Hardness: Grade 2
Style: Nylon Insert
Type: Lock Nut

Box of 10.

A lock nut is a nut that resists loosening under vibrations and torque.