S-91571A308 3/4"-10 x 4 1/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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 resistance to wear and deformation due to Rockwell C19 hardness, ensuring long-term fastener integrity under stress.
- Optimized for quick installation and high clamp force with UNC coarse threading and a Class 2A thread fit, reducing assembly time and preventing cross-threading.
- Robust external hex drive design allows for high torque application with standard tools, minimizing slippage and tool wear.
- Controlled partial threading provides an unthreaded grip length for precise shear load management in bolted joints.
- Full compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125, guaranteeing interchangeability and performance reliability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, ensuring safety and regulatory adherence for global projects.
Professional Applications & Engineering Value
This Grade A325 heavy-duty hex head screw is engineered to solve critical challenges in structural steel connections, bridge construction, and heavy machinery assembly. The high-strength steel construction and partially threaded design ensure that the unthreaded shank bears shear loads effectively, while the threaded portion secures the connection. The UNC coarse thread and Class 2A fit provide excellent engagement and vibration resistance, reducing the risk of joint failure in dynamic environments. Its external hex drive facilitates easy installation with common torque tools, making it ideal for time-sensitive industrial projects requiring dependable, high-clamp force fastening solutions.
Specification Summary & Compliance
This fastener features precise Class 2A thread fit and adheres to UNC coarse thread standards (3/4"-10). It is manufactured in compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring dimensional accuracy and mechanical properties. The product is also verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
