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

Key features

• 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.

Product DescriptionHillman 5/16"-18 zinc-plated nylon insert stop nuts are designed to provide secure and vibration-resistant fastening connections in a wide range of mechanical and construction applications. Commonly referred to as nylon insert lock nuts or Nylock nuts, these fasteners are widely used in equipment assembly, automotive repairs, structural installations, and maintenance projects. Each nut features an integrated nylon insert that grips the threads of the bolt as the nut is tightened. This creates additional friction that helps prevent the nut from loosening due to vibration, movement, or mechanical stress. The locking feature helps maintain consistent clamping force and improves the reliability of the fastening system. These lock nuts are designed to match 5/16"-18 USS coarse thread bolts or threaded rods, ensuring proper compatibility and dependable thread engagement. They can also be used alongside washers of the same size and finish to create a complete fastening system. Manufactured from durable steel, these nuts are finished with a zinc-plated coating that offers moderate protection against rust and corrosion. This corrosion-resistant finish helps maintain hardw

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