S-99291A410 3/4"-10 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through precision distorted top-lock thread design, preventing loosening in high-stress environments
• Enhanced durability and corrosion protection with black-oxide steel construction meeting ASTM Grade C strength requirements
• Reliable coarse thread engagement with 3/4"-10 UNC configuration for faster assembly and reduced cross-threading risks
• Consistent performance ensured by Class 2B thread fit for smooth installation and secure fastening
• Standard external hex drive providing compatibility with common tools and straightforward installation
• Environmental compliance assurance with full REACH and RoHS 3 certification for industrial safety standards
• Optimal dimensional stability with 1 1/8" width and 41/64" height for precise fit in standard applications

Professional Applications & Engineering Value

This 3/4"-10 UNC distorted thread locknut delivers critical vibration resistance where conventional fasteners fail. The top-lock distorted thread technology creates consistent interference along the mating surface, maintaining clamp force under extreme dynamic loads. Manufactured from black-oxide steel meeting ASTM Grade C specifications, it provides reliable strength while the oxide coating offers corrosion protection in industrial environments. The coarse UNC thread profile ensures rapid installation in heavy equipment, construction machinery, and transportation systems where vibration-induced loosening compromises safety. With external hex drive compatibility, maintenance teams achieve proper torque values using standard tools, reducing installation errors and downtime.

Specification Summary & Compliance

This locknut features Class 2B thread fit per UNC standards with 3/4"-10 coarse threading and right-hand orientation. Manufacturing complies with ASTM Grade C mechanical properties and dimensional requirements. The product fully meets REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) compliance standards for hazardous substance restrictions. Dimensions include 1-1/8" width across flats and 41/64" height with standard hex profile and external drive style.