S-97190A120 3/8"-24 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated cotter pin locking mechanism for reliable, long-term fastening in high-stress environments
• Enhanced corrosion protection through zinc-plated steel construction, extending service life in demanding industrial conditions
• Precise thread engagement with Class 2B fit and UNF fine threads ensuring consistent, secure mating with mating components
• High-strength performance meeting Grade 5 specifications for dependable load-bearing capacity in critical assemblies
• Quick installation and removal via standard external hex drive design compatible with common wrench tools
• Positive mechanical locking using standard 7/64" cotter pins for fail-safe security in rotating machinery applications
• Regulatory compliance assurance with RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This Grade 5 castle locknut delivers critical safety in applications where vibration-induced loosening poses significant risks. The zinc-plated steel construction provides essential corrosion resistance for outdoor equipment, agricultural machinery, and automotive systems exposed to harsh environments. The 3/8"-24 UNF fine threads with Class 2B fit maintain precise tolerances while the castellated design with 7/64" cotter pin compatibility creates a positive mechanical lock that prevents rotational loosening under extreme dynamic loads. Particularly valuable in axle assemblies, steering mechanisms, and rotating shaft applications, this locknut eliminates the need for secondary locking devices while providing visual confirmation of proper installation through the cotter pin slot.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 9/16" width and 21/64" height profiles. Features right-hand UNF fine threads with Class 2B thread fit ensuring consistent engagement across mating components. The locking mechanism accommodates standard 7/64" cotter pins with minimum slot dimensions of 0.11" depth and 0.12" width. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current substance restriction requirements. Manufactured to Grade 5 strength classification for reliable performance in industrial fastening applications.