Dorman 250011 Hex Lock Nuts with Nylon Insert Grade Thread - 2 5/16-18

The Dorman 250-011 hex lock nuts feature an integrated nylon insert ring that provides reliable resistance to vibration loosening in automotive, marine, and general mechanical applications. These Grade 2 steel fasteners are designed for 5/16-18 thread applications and offer reusable locking performance without the need for additional lock washers or thread adhesives.

Key Features:

• Nylon insert ring provides consistent prevailing torque to prevent loosening from vibration
• Grade 2 steel construction suitable for general-purpose automotive and mechanical fastening
• 5/16-18 thread size (5/16 inch diameter, 18 threads per inch)
• Hex head design allows standard wrench or socket installation
• Reusable design maintains locking capability through multiple installations
• Zinc-plated finish provides corrosion resistance

These nylon insert lock nuts are ideal for securing components subject to vibration, shock, or dynamic loading where standard hex nuts may back off over time. The nylon ring remains effective across a wide temperature range and grips threads firmly without galling or damaging the mating fastener.