S-91286A399 5/8"-11 x 2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc-flake coating that provides long-lasting protection in harsh industrial environments
• Precise thread engagement with Class 2A fit UNC coarse threads ensuring secure fastening and vibration resistance
• Maximum material durability from Rockwell C33 hardness Grade 8 steel construction that withstands heavy-duty use
• Optimized installation efficiency with external hex drive design allowing for high-torque application with standard tools
• Full-thread coverage along the 2" length provides consistent clamping force across the entire fastener
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interoperability

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 8 steel hex head screws deliver critical performance where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures structural integrity in heavy machinery, construction equipment, and automotive assemblies. The zinc-flake coated finish provides superior corrosion protection compared to conventional platings, significantly extending service life in exposed environments. With UNC coarse threads and Class 2A fit, these fully threaded hex bolts offer rapid installation and reliable clamping force distribution, making them ideal for high-vibration applications where loosening prevention is crucial. The external hex drive accommodates standard wrenching tools for efficient assembly in confined spaces.

Specification Summary & Compliance

This 5/8"-11 UNC hex head screw features precise Class 2A thread fit tolerances with coarse thread spacing for optimal engagement. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted substances. The 2" length with fully threaded design provides consistent performance across the entire fastener engagement area.