S-91571A320 7/8"-9 x 2 1/2" 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 applications.
• Superior durability and wear resistance due to Rockwell C19 hardness, ensuring long service life under demanding conditions.
• Easy installation and removal with external hex drive and coarse UNC threads, reducing assembly time and labor costs.
• Precise thread engagement with Class 2A thread fit for secure fastening and vibration resistance in industrial machinery.
• Optimized weight distribution through partial threading and specific grip length, enhancing stability in construction projects.
• Compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125, guaranteeing consistent quality and safety.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, supporting sustainable procurement practices.

Professional Applications & Engineering Value

This 7/8"-9 UNC Grade A325 hex head screw is engineered to address critical challenges in heavy-duty applications, such as structural steel connections, bridge construction, and industrial machinery assembly. The high-strength steel material and coarse thread design provide excellent resistance to shear and tensile stresses, preventing joint failure under dynamic loads. With a partially threaded shank, it ensures that the unthreaded portion bears against connected materials, reducing stress concentration and improving fatigue life. The external hex drive allows for high-torque installation with standard tools, speeding up projects while maintaining Class 2A thread fit accuracy. Ideal for environments requiring reliable, long-lasting fasteners, this screw meets rigorous standards like ASME B18.2.6 and ASTM A325, making it a trusted choice for engineers and contractors seeking durability and compliance in inch-system fasteners.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse threads with a size of 7/8"-9. It conforms to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring reliability in structural applications. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations without compromising performance.