Briggs & Stratton 5106040FS Nylon Insert Lock Nut - 1/4-20

The Briggs & Stratton 5106040FS is a 1/4-20 nylon insert lock nut (commonly known as a Nylock nut) designed for use in small engine applications. This OEM replacement fastener features an integrated nylon collar that creates friction against the bolt threads, preventing loosening due to vibration and ensuring secure fastening in demanding conditions.

Key Features:

• Thread size: 1/4-20 UNC (Unified National Coarse)
• Nylon insert locking mechanism resists vibration loosening
• Genuine Briggs & Stratton OEM part for reliable fit and performance
• Suitable for engine assemblies, blade mounts, and general equipment fastening
• Cross-reference part number A0108

This lock nut is a critical component for maintaining proper torque specifications and preventing hardware failure on lawn mowers, generators, pressure washers, and other Briggs & Stratton-powered equipment. The self-locking design eliminates the need for separate lock washers or thread-locking compounds in many applications.