S-91571A452 1"-8 x 5 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 tensile strength of 120,000 psi ensures reliable performance in heavy-duty structural applications, reducing the risk of fastener failure under high stress.
• Grade A325 steel construction with Rockwell C19 hardness provides superior durability and resistance to wear, extending service life in demanding industrial environments.
• Partially threaded design with a 3 3/4" grip length offers optimal clamping force and vibration resistance, enhancing joint stability in structural assemblies.
• Class 2A thread fit and 1"-8 UNC coarse threading allow for easy installation and removal while maintaining precise alignment, saving time during assembly and maintenance.
• External hex drive and 1 5/8" head width enable secure tool engagement and high torque application, minimizing slippage and improving installation efficiency.
• Compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 standards guarantees consistent quality and interoperability, ensuring compatibility with industry specifications.
• RoHS 3 and REACH compliance supports environmental safety and regulatory adherence, making these screws suitable for global supply chains and sustainable projects.

Professional Applications & Engineering Value

Engineered for high-strength structural fastening, this Grade A325 hex head screw addresses critical challenges in industrial and construction settings. The heavy-duty steel material and 120,000 psi tensile strength provide robust resistance to dynamic loads and fatigue, ideal for bridges, buildings, and machinery where safety is paramount. The partially threaded configuration and coarse UNC threads enhance grip and reduce loosening from vibrations, while the external hex drive simplifies installation in tight spaces. By meeting ASME B18.2.6 and other key standards, it ensures reliability in structural applications, minimizing downtime and maintenance costs for B2B clients.

Specification Summary & Compliance

This fastener adheres to precise Class 2A thread fit and UNC coarse thread standards, ensuring dimensional accuracy for seamless integration. It complies with ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing specifications, and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, affirming its suitability for regulated industrial use.