S-91286A396 5/8"-11 x 1 3/4" 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 Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
• Optimized thread engagement through UNC coarse spacing and Class 2A fit ensures secure fastening and vibration resistance
• Enhanced installation efficiency with external hex drive design allowing for high torque application and quick assembly
• Maximum thread coverage with fully threaded design provides consistent clamping force along the entire fastener length
• Premium material integrity from steel construction with Rockwell C33 hardness maintaining dimensional stability under heavy loads
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 steel hex head screw delivers exceptional performance where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures reliable fastening in structural assemblies, machinery frames, and equipment requiring superior vibration resistance. The zinc-flake coated finish provides robust corrosion protection in demanding environments, while the 5/8"-11 UNC coarse thread with Class 2A fit enables quick installation and secure mating with corresponding nuts. The external hex drive design accommodates standard wrenching tools, making it ideal for maintenance operations and production lines where high torque applications are common. These fully threaded hex screws maintain consistent clamping force across the entire engagement length, preventing joint loosening in dynamic load conditions.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 5/8"-11 UNC coarse spacing and right-hand threading. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications requiring adherence to strict safety and environmental standards.