#8-32 18-8 Stainless Steel Coarse Thread Keps Lock Nuts (20 pcs.)

Diameter: #8
Diameter 2: 3/8"
Thickness: 13/32"
Material: Stainless Steel
Driver Type: 11/32" Wrench
Thread Size: 32 (Coarse)
Hardness: 18-8
Style: Kep
Type: Lock Nut
Washer Diameter: 3/8"

Box of 20.

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