Top Lock Nuts

Top lock nuts are a type of prevailing torque lock nut engineered to resist loosening under vibration and stress. Unlike nylon insert locknuts, top lock nuts use a deformed thread section at the top of the nut to create friction and maintain a secure hold without the use of additional locking elements. They're ideal for high-vibration applications such as automotive, machinery, and heavy equipment assemblies.

Springs Fastener stocks a wide selection of top lock nuts in various thread sizes and materials. Whether you need a small quantity for a repair job or bulk quantities for production, we offer convenient packaging options and tiered bulk pricing to fit your needs.

Most orders ship within 24 hours, and we deliver nationwide across the United States.

Browse our inventory of top lock nuts below, or explore more fastening solutions in our full nuts category.