S-91268A817 5/8"-11 x 3 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity - Grade 8 steel construction with 150,000 PSI tensile strength ensures reliable performance in high-stress applications
• Superior Durability - Rockwell C33 hardness provides excellent resistance to wear and deformation under heavy loads
• Optimized Thread Engagement - 5/8"-11 UNC coarse threading with Class 2A fit offers secure fastening and vibration resistance
• Easy Installation & Removal - External hex drive with 15/16" head width allows for standard wrench access and high torque application
• Versatile Partial Threading - 1 1/2" minimum thread length provides flexibility for both clamping and alignment applications
• Industry Compliance - Meets ASME B18.2.1 and SAE J429 standards for consistent quality and interchangeability
• Environmental Responsibility - RoHS 3 and REACH compliant for safe use in regulated industrial environments

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial applications where failure is not an option. The 150,000 PSI tensile strength and Rockwell C33 hardness make it ideal for heavy machinery, structural steel connections, and high-vibration environments. The 5/8"-11 UNC coarse threading provides superior grip in both metal and composite materials, while the partial threading design allows for precise clamping force distribution. The external hex drive configuration ensures reliable torque transmission during installation, critical for assembly line efficiency and maintenance operations. These industrial fasteners are engineered to withstand extreme conditions while maintaining structural integrity, reducing downtime and maintenance costs in construction, manufacturing, and heavy equipment applications.

Specification Summary & Compliance

This heavy-duty fastener features precise Class 2A thread fit tolerance for consistent performance and meets ASME B18.2.1 and SAE J429 specifications. The 5/8"-11 UNC coarse thread with right-hand direction and 0.625" thread diameter ensures proper engagement in accordance with industry standards. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and regulatory acceptance for global industrial applications.