Dorman 810-040 Nylon Insert Lock Nuts 1/4-20 Grade 2 (Pack of 5)

The Dorman 810-040 hex lock nuts feature a nylon insert ring that provides reliable vibration resistance for automotive, marine, and general fastening applications. These Grade 2 steel lock nuts are designed to maintain secure connections in environments where vibration and movement could cause standard nuts to loosen over time.

Key Specifications:

• Thread size: 1/4-20 (fine thread)
• Hex size: 7/16 inch across flats
• Overall height: 5/16 inch
• Grade 2 steel construction
• Nylon insert locking mechanism
• Zinc-plated finish for corrosion resistance

Features & Benefits:

• Nylon ring grips threads to prevent loosening from vibration
• Reusable design maintains locking capability through multiple installations
• Standard hex design works with conventional wrenches and sockets
• Suitable for temperatures up to 250°F
• Cost-effective solution for securing bolts in automotive repairs and maintenance

These prevailing torque lock nuts are ideal for suspension components, exhaust systems, engine accessories, and other applications where maintaining proper torque is critical. The nylon insert creates friction against bolt threads without requiring deformation of the nut itself.