S-90499A863 1 3/8"-12 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 8 steel construction, ensuring reliable performance in high-stress industrial environments
• Precise thread engagement through UNF fine threads and Class 2B fit, minimizing vibration loosening and maintaining secure connections
• Superior corrosion resistance from high-grade steel material, extending service life in demanding applications
• Optimized installation efficiency with standard external hex drive design, compatible with common wrenching tools
• Enhanced safety compliance meeting RoHS 3 and REACH environmental standards for industrial use
• Right-hand thread direction providing standardized installation familiar to maintenance teams
• Robust dimensional stability with 2 1/16" width and 1 11/64" height maintaining consistent performance under torque

Professional Applications & Engineering Value

This Grade 8 steel hex nut delivers critical engineering value in heavy machinery, construction equipment, and automotive assemblies where vibration resistance and tensile strength are paramount. The 1 3/8"-12 UNF fine thread configuration provides increased thread contact area compared to coarse threads, significantly reducing the risk of loosening under dynamic loads. The Class 2B thread fit ensures consistent engagement with mating components while allowing for efficient assembly in manufacturing environments. Manufactured from high-strength steel with external hex drive compatibility, this fastener meets the rigorous demands of industrial maintenance, structural connections, and heavy equipment manufacturing where failure is not an option.

Specification Summary & Compliance

This heavy-duty hex nut features 1 3/8"-12 UNF fine threads with Class 2B fit per Unified Thread Standard specifications, ensuring precise dimensional accuracy and reliable performance. The fastener meets Grade 8 strength requirements for superior mechanical properties in demanding applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety standards are maintained. Dimensions include 2 1/16" width across flats and 1 11/64" height, manufactured to industrial standards for consistent quality and performance.