S-91571A328 7/8"-9 x 5" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional structural integrity with Grade A325 certification and 120,000 psi tensile strength for reliable performance in demanding applications
• Optimized load distribution through partially threaded design with 3½" grip length, minimizing stress concentration points
• Superior durability with Rockwell C19 hardness steel construction that resists deformation under heavy loads
• Quick installation and removal with external hex drive and 1 7/16" head width for standard wrench compatibility
• Secure fastening performance with Class 2A thread fit and coarse UNC threading that resists vibration loosening
• Industry compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for quality verification
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable industrial applications

Professional Applications & Engineering Value

This heavy-duty hex head screw delivers critical engineering solutions for structural applications where failure is not an option. The Grade A325 steel construction with Rockwell C19 hardness provides exceptional resistance to shear and tensile forces, making it ideal for construction and structural bolting applications. The partially threaded design with substantial 3½" grip length ensures that the unthreaded shank bears against connected materials, preventing joint slippage under dynamic loads. The coarse UNC threading and Class 2A thread fit offer superior resistance to vibration-induced loosening, while the external hex drive with generous 1 7/16" head width accommodates standard industrial wrenches for efficient installation in confined spaces. These industrial hex bolts are engineered to maintain integrity in heavy-duty applications where reliability is paramount.

Specification Summary & Compliance

This 7/8"-9 UNC hex head screw features precise Class 2A thread fit tolerances and coarse thread spacing per Unified National Coarse standards. Manufacturing complies with ASME B18.2.6 dimensional specifications and ASTM A325/ASTM F3125 material and mechanical property requirements. The fastener maintains full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations concerning chemical substances, ensuring environmental responsibility in industrial applications.