3/4"-10 Black Phosphate Grade 2 Lock Nuts LNS-420 (48 pcs.)

Diameter: 3/4"
Diameter 2: 1-7/32"
Thickness: 21/32"
Material: Steel
Finish: Black Phosphate
Driver Type: 1-1/8" Wrench
Thread Size: 10 (Coarse)
Hardness: Grade 2
Style: Top Lock|Type C
Type: Lock Nut

Box of 48.

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