S-91837A031 3/8"-16 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted top lock thread design, preventing loosening in high-stress environments
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh conditions
• Reliable Grade 2 strength classification ensuring consistent performance in industrial applications
• Easy installation and removal with standard external hex drive design using common tools
• Precise Class 2B thread fit for smooth engagement and secure fastening with mating components
• Compliance with environmental regulations including REACH and RoHS 3 for global industrial use
• Optimized 9/16" width and 21/64" height providing standard profile compatibility while maintaining locking functionality

Professional Applications & Engineering Value

This 3/8"-16 UNC top lock nut addresses critical vibration-induced failure points in industrial machinery, automotive assemblies, and heavy equipment. The distorted thread locking mechanism creates consistent interference along the mating bolt's threads, eliminating the need for additional locking washers or adhesives. Manufactured from zinc-plated steel, the nut provides essential corrosion resistance while maintaining the Grade 2 strength classification required for medium-duty applications. The coarse UNC thread profile ensures rapid installation in production environments, while the external hex drive accommodates standard wrenching tools for efficient maintenance access. This engineered solution combines reliable vibration resistance with the durability needed for repetitive disassembly and reassembly cycles common in manufacturing and maintenance operations.

Specification Summary & Compliance

This locknut features 3/8"-16 UNC coarse threads with Class 2B thread fit tolerance for precise engagement. The right-hand thread direction and top lock distorted thread design conform to industrial standards for vibration-resistant fastening. Manufacturing complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use across global markets. Physical dimensions include 9/16" width across flats and 21/64" height, providing standard hex nut profile compatibility while incorporating the specialized locking feature.