S-91571A246 1/2"-13 x 1 1/4" 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 high-stress structural connections.
• Superior resistance to wear and deformation due to Rockwell C19 hardness, ensuring long-term durability in demanding environments.
• Optimized for quick installation and secure fastening with a fully threaded 1/2"-13 UNC coarse thread design that enhances grip and vibration resistance.
• Wide compatibility and precise fit achieved through Class 2A thread fit, reducing the risk of cross-threading and assembly errors.
• Robust drive engagement provided by the external hex head (7/8" width and 5/16" height), allowing for high torque application with standard tools.
• Compliance with rigorous industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125, guaranteeing consistency and safety in critical applications.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, supporting sustainable procurement practices.

Professional Applications & Engineering Value

This Grade A325 steel hex head screw is engineered to address common challenges in structural and industrial fastening, such as joint failure under dynamic loads and corrosion-induced weakening. The fully threaded UNC coarse thread design ensures maximum thread engagement, distributing stress evenly to prevent loosening from vibrations—a critical advantage in construction machinery, steel frameworks, and bridge assemblies. Made from high-strength steel and featuring an external hex drive, it enables efficient installation with common wrenches, reducing labor time while maintaining 120,000 psi tensile strength. Ideal for heavy-duty applications like connecting beams or securing heavy equipment, this fastener delivers reliability where safety and performance are paramount.

Specification Summary & Compliance

The screw adheres to precise Class 2A thread fit tolerances for consistent assembly, with UNC coarse threads (1/2"-13) meeting standardized dimensions. It conforms to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring material and manufacturing integrity. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmental and safety regulations without compromising performance.