S-91571A431 3/4"-10 x 5 3/4" 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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in heavy-duty structural and construction applications.
• Superior durability and wear resistance due to Grade A325 steel construction and Rockwell C19 hardness, extending service life in demanding environments.
• Secure and stable fastening ensured by UNC coarse threads and Class 2A thread fit, providing excellent grip and vibration resistance.
• Easy installation and removal with an external hex drive and 1 1/4" head width, allowing for standard wrench use and efficient assembly.
• Optimized for partial threading with a 1 3/8" thread length and 4 3/8" grip length, offering precise clamping force control in joint connections.
• Full compliance with industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125, guaranteeing consistent quality and engineering reliability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, ensuring safety and regulatory adherence for industrial use.

Professional Applications & Engineering Value

This Grade A325 hex head screw is engineered to address critical challenges in heavy-duty industrial and construction applications, such as structural steel connections, machinery assembly, and infrastructure projects. The high-strength steel material, combined with a Rockwell C19 hardness, provides exceptional resistance to shear and tensile stresses, reducing the risk of fastener failure under dynamic loads. The UNC coarse thread design and Class 2A thread fit ensure quick assembly and reliable holding power, even in high-vibration environments. With a partially threaded shank, it allows for precise load distribution, making it ideal for structural bolting where joint integrity is paramount. Its compliance with ASME B18.2.6 and other key standards ensures consistent performance, supporting engineering efficiency and safety in demanding settings.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and UNC coarse threading with a 3/4"-10 size. It meets rigorous manufacturing specifications under ASME B18.2.6, ASTM A325, and ASTM F3125, ensuring reliability in structural applications. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in industrial procurement.