S-97190A035 3/4"-10 Locknuts

Key Features & Benefits at a Glance

• Secure locking mechanism with cotter pin compatibility prevents loosening under vibration and dynamic loads
• Enhanced corrosion resistance through zinc plating extends service life in harsh industrial environments
• High-strength Grade 5 steel construction provides reliable performance in heavy-duty applications
• Precision-engineered slot dimensions (0.217" depth, 0.18" width) ensure proper cotter pin installation and retention
• Standard UNC coarse threading enables quick assembly and disassembly while maintaining secure fastening
• External hex drive design allows for easy installation with common wrench tools
• Compliance with international standards including REACH and RoHS 3 ensures environmental and safety compliance

Professional Applications & Engineering Value

This Grade 5 castle locknut delivers critical safety and reliability in demanding mechanical systems where vibration-induced loosening poses significant risks. The zinc-plated steel construction provides essential corrosion protection for outdoor equipment, agricultural machinery, and industrial applications exposed to moisture and chemicals. The precisely machined cotter pin slots (designed for 5/32" pins) create a positive mechanical lock that prevents rotational movement, making it ideal for axle assemblies, king pins, and rotating shaft applications. The 3/4"-10 UNC coarse threads and Class 2B thread fit ensure consistent engagement with mating components while accommodating minor misalignments. This combination of mechanical strength, corrosion resistance, and reliable locking action makes it an essential component for maintenance-critical systems requiring fail-safe fastening solutions.

Specification Summary & Compliance

This castle locknut features 3/4"-10 UNC coarse threads with Class 2B thread fit for standard industrial applications. The external hex drive measures 1 1/8" across flats with a 41/64" height profile. Manufactured from Grade 5 steel with zinc plating for corrosion protection, the nut accommodates 5/32" cotter pins with minimum slot dimensions of 0.217" depth and 0.18" width. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring safe use across various industrial sectors.