1"-8 Black Phosphate Grade 2 Steel Coarse Thread Lock Nuts

Diameter: 1"
Diameter 2: 1-11/16"
Thickness: 7/8"
Material: Steel
Finish: Black Phosphate
Driver Type: 1-1/2" Wrench
Thread Size: 8 (Coarse)
Hardness: Grade 2
Style: Top Lock|Type C
Type: Lock Nut

Box of 20.

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