Hillman Lock Nuts, 5/16-18, 100 Pack, Zinc

NYLON INSERT LOCK NUTS RESIST VIBRATION LOOSENING: 5/16 in.-18 nylon insert stop nuts grip bolt threads as the nut is tightened, preventing loosening from vibration, movement, or repeated use in mechanical and construction assemblies. | BUILT-IN NYLON INSERT FOR RELIABLE LOCKING PERFORMANCE: Integrated nylon locking insert creates friction against bolt threads during tightening, keeping the nut firmly in place and reducing back-off risk over time in demanding fastening uses. | COMPATIBLE WITH 5/16 IN.-18 COARSE THREAD BOLTS AND RODS: Engineered for 5/16 in.-18 coarse thread bolts and threaded rods, ensuring proper thread engagement and dependable fastening in construction hardware and mechanical assemblies. | ZINC-PLATED STEEL FOR CORROSION RESISTANCE: Durable steel with zinc-plated coating provides moderate rust protection for general-purpose fastening applications. Dependable performance in construction and mechanical installations. 100-piece pack. | TRUSTED HILLMAN FASTENING SOLUTIONS: Hillman hardware products are engineered for consistent quality, dependable performance, and reliable fastening across construction, repair, and home improvement project applications.