1/4" 5/16" 3/8" 1/2" UNC NYLOC NUTS ZINC PLATED STEEL LOCKING NUTS NYLON INSERT

Nyloc Nuts. 1/4" / 5/16" / 3/8" / 1/2" UNC Nyloc Nuts – Zinc Plated Steel (Imperial Coarse Thread Lock Nuts with Nylon Insert). Type: Nyloc Insert Lock Nut. Hex Bolts - UNC. UNC Bolts & Set Screws. Thread Type: Unified Coarse (UNC).

eBay