Dorman 878-307 Hex Lock Nut with Nylon Insert Ring Class 8 M7-1.0 7mm

The Dorman 878-307 is a Class 8 metric hex lock nut featuring an integrated nylon insert ring (also known as a nyloc or prevailing torque nut). Designed for general-purpose automotive and mechanical fastening applications, this nut provides reliable vibration resistance by using a nylon collar that creates friction against the bolt threads, preventing loosening under dynamic loads.

Key Specifications:

• Thread Size: M7-1.0 (7mm diameter, 1.0mm pitch)
• Nut Height: 7mm
• Strength Class: Class 8 metric
• Locking Mechanism: Nylon insert ring (prevailing torque)
• Style: Hex (six-sided)

Key Features:

• Nylon insert ring prevents loosening due to vibration and dynamic loads
• Manufactured from durable materials and corrosion tested for long-term reliability
• Class 8 strength rating meets standard metric hardware specifications
• Single-use locking nut — nylon insert maintains clamping force once torqued
• Ideal for automotive repair, maintenance, and general mechanical assembly

The Dorman 878-307 is part of Dorman's extensive multi-purpose hardware line, offering a high-quality replacement or supplemental fastener solution for a wide range of repair and assembly needs.