S-91571A403 1/2"-13 x 3 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 structural integrity with Grade A325 certification and 120,000 psi tensile strength for reliable performance in heavy-load applications
• Superior wear resistance due to Rockwell C19 hardness, extending service life in demanding industrial environments
• Optimized load distribution through partially threaded design with 2 1/4" grip length for enhanced joint stability
• Quick installation and removal with external hex drive and 7/8" head width for standard tool compatibility
• Secure fastening in various materials using 1/2"-13 UNC coarse threads with Class 2A fit for consistent engagement
• Compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125 for quality assurance
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global regulatory acceptance

Professional Applications & Engineering Value

Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws address critical challenges in construction and industrial applications. The high-strength steel composition combined with Rockwell C19 hardness provides exceptional resistance to vibration loosening and fatigue failure. The partially threaded design ensures optimal clamp load distribution while the 1/2"-13 UNC coarse threads facilitate rapid installation in structural steel, reducing labor time. These heavy-duty fasteners maintain integrity under extreme tension, making them ideal for structural framing, bridge construction, and industrial equipment where failure is not an option.

Specification Summary & Compliance

This inch system fastener features precise Class 2A thread fit with 1/2"-13 UNC coarse threads and 3 1/4" total length. Manufactured to ASME B18.2.6 dimensional specifications and ASTM A325/ASTM F3125 material standards. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial markets.