S-91268A824 5/8"-11 x 5" 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 maximum reliability in demanding applications
• Superior wear resistance due to Rockwell C33 hardness, ensuring long-term performance under vibration and stress
• Optimized coarse UNC threading provides faster assembly and superior resistance to loosening in heavy machinery
• Partial threading design delivers precise clamping force control and prevents joint separation in structural applications
• External hex drive compatibility allows for high-torque installation using standard industrial tools
• Class 2A thread fit ensures consistent engagement and smooth installation while maintaining dimensional accuracy
• Full regulatory compliance with RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

These Grade 8 hex head screws represent the pinnacle of heavy-duty fastening technology, specifically engineered to address critical challenges in industrial assembly and structural applications. The high-strength steel construction combined with Rockwell C33 hardness provides exceptional resistance to shear forces and vibrational loosening in machinery, construction equipment, and transportation systems. The 5/8"-11 UNC coarse thread configuration ensures rapid installation while maintaining superior holding power in both soft and hard materials. The partial threading design offers precise unthreaded shank sections that function as shear planes, making these fasteners ideal for structural connections where precise clamp load distribution is critical. Meeting ASME B18.2.1 and SAE J429 specifications, these screws deliver consistent performance in the most demanding industrial environments.

Specification Summary & Compliance

This 5/8"-11 UNC hex head screw features precise Class 2A thread fit tolerances and 5" length with 1 1/2" minimum thread length. Manufactured to exacting ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring dimensional consistency and mechanical performance. 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 strict material restrictions.