S-97190A110 1/4"-28 Locknuts

Key Features & Benefits at a Glance

• Secure locking mechanism with cotter pin compatibility prevents loosening under extreme vibration and dynamic loads
• High-strength Grade 5 steel construction delivers reliable performance in demanding industrial applications
• Zinc-plated corrosion-resistant finish extends service life in harsh environmental conditions
• Precision UNF fine threads (Class 2B fit) ensure smooth engagement and consistent clamping force
• External hex drive design allows for high-torque installation using standard tools
• Deep 0.072" minimum slot depth provides positive cotter pin retention for fail-safe operation
• Compliant with REACH and RoHS 3 standards meets international environmental and safety regulations

Professional Applications & Engineering Value

This Grade 5 castle locknut with 1/4"-28 UNF fine threads addresses critical safety requirements in high-vibration environments where conventional fasteners fail. The zinc-plated steel construction combines corrosion resistance with the mechanical strength needed for heavy-duty industrial applications including machinery, automotive, and construction equipment. The external hex drive facilitates proper torque application while the cotter pin locking system creates a permanent mechanical lock that withstands cyclic loading and shock impacts. Engineered with Class 2B thread fit, this castle locknut maintains precise alignment and clamping force in assemblies subject to constant motion and stress.

Specification Summary & Compliance

Manufactured to exacting standards with Class 2B thread fit and UNF thread specifications. Dimensions include 7/16" width and 7/32" height with 1/16" cotter pin diameter compatibility. Features 0.072" minimum slot depth and 0.07" minimum slot width for secure pin retention. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use across global industrial markets.