S-91571A354 1 1/4"-7 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 tensile strength of 105,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• High hardness rating (Rockwell C19) provides superior resistance to wear and deformation, extending service life in demanding environments.
• Coarse UNC threading offers faster installation and better debris resistance compared to fine threads, improving efficiency in construction and structural projects.
• Class 2A thread fit ensures consistent, easy assembly while maintaining secure fastening, minimizing production delays and rework.
• Partially threaded design allows for precise clamp load distribution, ideal for connections where unthreaded shank strength is crucial.
• Compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 guarantees adherence to industry standards, providing confidence in quality and interoperability.
• RoHS 3 and REACH compliance ensures environmental and regulatory safety, making these screws suitable for global industrial supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade A325 hex head screws excel in structural steel connections, bridge construction, and machinery assembly where high tensile strength and durability are non-negotiable. The steel material combined with UNC coarse threading and external hex drive design addresses common challenges like vibration loosening and rapid installation under tough conditions. With a partially threaded shank, the fastener optimizes grip length for enhanced shear resistance, reducing joint slippage in dynamic loads. This makes it an indispensable heavy-duty fastener for projects requiring compliance with ASTM A325 and ASME B18.2.6 standards, ensuring long-term reliability and safety in critical infrastructures.

Specification Summary & Compliance

This 1 1/4"-7 UNC screw features a Class 2A thread fit for precise dimensional accuracy and easy assembly. It conforms to ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing specifications, ensuring consistent performance in structural applications. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.