S-90675A031 3/8"-16 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through integrated external-tooth lock washer that bites into mating surfaces for secure locking in high-motion environments
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in industrial settings
• Reliable reusability allowing for multiple installations without compromising locking performance
• Easy installation and removal with standard external hex drive design compatible with common wrench tools
• Precise thread engagement with Class 2B thread fit ensuring consistent performance across applications
• Optimized for coarse thread applications using UNC 3/8"-16 threading for rapid assembly in industrial equipment
• Dual-material durability combining steel nut body with steel lock washer for uniform strength characteristics

Professional Applications & Engineering Value

This zinc-plated steel locknut with external-tooth lock washer addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and structural frameworks. The UNC coarse thread design enables faster installation while maintaining secure fastening in high-vibration environments. The integrated locking mechanism provides consistent vibration resistance without requiring additional components, streamlining assembly processes. The external hex drive accommodates standard tools for efficient maintenance and disassembly, making it ideal for applications requiring periodic inspection or adjustment. Engineered for industrial locknut applications where reliability and reusability are paramount, this fastener delivers consistent performance in demanding conditions while reducing maintenance frequency and associated downtime.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit tolerances ensuring proper engagement with mating components. Features UNC 3/8"-16 coarse thread with right-hand direction and standard hex profile (9/16" width, 25/64" height). Lock washer specifications include steel construction with 0.656" OD external-tooth design. Complies with industry standards for inch system fasteners and suitable for applications requiring RoHS and REACH compliant components.