S-90636A041 1/4"-28 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread design that maintains secure fastening under dynamic loads
• Exceptional corrosion protection with zinc yellow-chromate plating that withstands harsh industrial environments
• Heavy-duty performance backed by Grade 8 strength classification for high-stress applications
• Precise thread engagement with Class 2B fit ensuring reliable installation and consistent clamping force
• Optimized torque transmission through standard external hex drive design for easy installation with common tools
• Fine thread advantage with 1/4"-28 UNF configuration providing better tension control and vibration resistance
• Dimensional reliability with 7/16" hex width and 7/32" height for consistent performance across applications

Professional Applications & Engineering Value

This Grade 8 heavy-duty locknut addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and construction equipment. The center lock distorted thread mechanism creates permanent friction along the mating bolt threads, effectively resisting rotational forces that cause conventional nuts to fail. Manufactured from zinc yellow-chromate plated steel, this fastener delivers extended service life in corrosive environments while maintaining its locking properties. The 1/4"-28 UNF fine thread configuration ensures superior clamping force distribution and enhanced resistance to vibrational loosening compared to coarse thread alternatives. Engineering teams specify this external hex locknut for critical joints in powertrain systems, heavy equipment, and structural applications where safety and reliability are paramount.

Specification Summary & Compliance

This industrial locknut features precision Class 2B thread fit per UNF standards with 1/4"-28 fine thread configuration and right-hand thread direction. The fastener meets Grade 8 strength requirements with dimensional specifications including 7/16" width across flats and 7/32" height. Manufacturing complies with relevant industrial standards for distorted thread locknuts, while the zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection for industrial applications.