S-91571A356 1 1/4"-7 x 6" 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 Tensile Strength: With a 105,000 psi tensile rating, this screw provides reliable performance in high-stress structural applications, reducing the risk of fastener failure.
• Superior Hardness & Durability: Rockwell C19 hardness ensures excellent wear resistance and longevity, even under repetitive loading and harsh environmental conditions.
• Precise Thread Fit: Class 2A thread fit offers consistent engagement and ease of assembly while maintaining secure fastening in coarse UNC threading.
• Optimized for Heavy-Duty Use: The partially threaded design with a 4" grip length provides enhanced clamping force in structural steel connections, minimizing joint slippage.
• Compliance with Rigorous Standards: Meets ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring interoperability and reliability in regulated industrial projects.
• Environmental & Safety Compliance: RoHS 3 and REACH compliant, making these screws suitable for global supply chains and environmentally conscious manufacturing.
• Easy Installation & Removal: External hex drive and 2" head width allow for straightforward torque application with standard tools, speeding up assembly and maintenance.

Professional Applications & Engineering Value

Engineered for structural steel connections in bridges, buildings, and heavy machinery, this Grade A325 hex head screw addresses critical challenges like vibration loosening and tensile overload. The UNC coarse threading and partially threaded design ensure optimal load distribution and resistance to shear forces, while the steel material and Rockwell C19 hardness provide corrosion resistance and durability in outdoor or industrial environments. By meeting ASTM A325 and ASME B18.2.6 standards, it guarantees consistency in high-strength bolting applications, reducing installation errors and enhancing project safety.

Specification Summary & Compliance

This screw features a 1 1/4"-7 UNC thread with Class 2A fit for precise tolerance, a 6" length, and partial threading over a 2" thread length. It complies with ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing specifications, and is verified as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant for environmental safety.