[50 PKG] Heavy Hex Lock Nuts NTU Nylon Inserts Steel Zinc 5/8-11

Meet the Heavy Hex Lock Nuts NTU Nylon Inserts Steel Zinc 5/8-11 — the rugged fastener designed for high-vibration assemblies. These heavy hex lock nuts pair durable steel with a molded nylon insert to help resist loosening and maintain torque under load.

Designed for reliability in demanding environments, the NTU nylon insert locks the nut in place to prevent back-out when subjected to shock, vibration, or movement.

Key features

• Material: Steel with zinc finish for corrosion resistance
• Locking mechanism: Nylon insert (NTU) provides vibration-resistance lock
• Thread size: 5/8-11 for common heavy-duty applications
• Applications: Ideal for automotive, machinery, construction, and equipment assemblies
• Finish: Zinc-plated to extend service life in harsh environments

Whether you're outfitting a new build or repairing an aging fixture, these heavy hex nuts offer secure, long-lasting performance in a compact package. Add them to your toolbox and secure your assemblies with confidence.