S-91026A030 5/16"-18 ASTM A194 Hex Nuts

Key Features & Benefits at a Glance

• Superior load distribution thanks to the extra wide hex profile, reducing stress concentrations and preventing joint failure in heavy-duty applications
• Enhanced corrosion resistance from the black-oxide steel finish, ensuring long-term reliability in harsh industrial environments
• High-strength performance with ASTM Grade 2H certification, providing dependable clamping force for critical assemblies
• Easy installation and removal with coarse UNC threads and Class 2B fit, enabling quick assembly while maintaining secure fastening
• Compliance with industry standards including ASTM A194, ensuring consistent quality and interchangeability in mechanical systems
• Environmental responsibility through RoHS 3 compliance, meeting global regulatory requirements for hazardous substances
• Optimized wrench engagement with external hex drive design, allowing for high torque application without stripping

Professional Applications & Engineering Value

This heavy-duty hex nut delivers exceptional engineering value through its black-oxide steel construction and extra wide profile, specifically designed to address common industrial challenges. The combination of ASTM Grade 2H strength and coarse UNC threads ensures reliable performance in vibration-prone environments where loosening is a concern. The Class 2B thread fit provides optimal clearance for rapid assembly while maintaining structural integrity. Ideal for construction equipment, agricultural machinery, and industrial manufacturing applications, this nut's enhanced load distribution prevents surface damage and extends service life in high-stress connections. The black-oxide surface treatment offers superior protection against corrosion, making it suitable for outdoor and chemically exposed environments where fastener degradation compromises safety.

Specification Summary & Compliance

This 5/16"-18 UNC hex nut features Class 2B thread fit with coarse thread spacing, manufactured to ASTM A194 specifications and ASTM Grade 2H strength requirements. The inch-system fastener maintains precise dimensional accuracy with a width of 9/16" and height of 19/64". Compliant with RoHS 3 (2015/863/EU) standards under exemption 6(a) for lead as an alloying element in steel, ensuring environmental responsibility while delivering industrial-grade performance.