S-97190A015 3/8"-16 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through integrated cotter pin locking mechanism, preventing loosening in high-stress applications
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in demanding environments
• High-strength performance meeting Grade 5 specifications, ensuring reliable fastening under heavy loads
• Easy installation and removal with standard external hex drive profile compatible with common wrench tools
• Precision threading with Class 2B UNC coarse threads for smooth engagement and consistent clamping force
• Regulatory compliance with REACH and RoHS 3 standards, meeting international environmental and safety requirements
• Optimized slot dimensions (0.11" depth, 0.12" width) for secure cotter pin retention and quick visual inspection

Professional Applications & Engineering Value

This Grade 5 castle locknut delivers critical security for industrial assemblies where vibration-induced loosening poses significant risks. The zinc-plated steel construction provides essential corrosion resistance in manufacturing, automotive, and heavy equipment applications, while the 3/8"-16 UNC coarse thread ensures rapid installation and reliable performance. The integrated cotter pin locking system (accommodating 7/64" pins) creates a positive mechanical lock that eliminates the need for secondary locking devices, reducing assembly time and maintenance costs. Particularly valuable in right-hand thread applications requiring frequent disassembly, this external hex drive nut maintains structural integrity through multiple service cycles, making it ideal for axle assemblies, linkage systems, and rotating machinery where safety-critical connections demand absolute reliability.

Specification Summary & Compliance

This castle locknut features precision Class 2B thread fit with UNC coarse threading (3/8"-16) for optimal engagement and load distribution. Manufactured to Grade 5 strength classification with standard hex profile (9/16" width, 21/64" height) and cotter pin accommodation (7/64" diameter). The product fully complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental directives, ensuring regulatory adherence for industrial distribution and use.