S-91583A302 1 1/4"-7 x 3" 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 105,000 psi tensile strength for reliable performance in heavy-duty structural applications
• Superior corrosion resistance through hot-dipped galvanized steel coating, extending service life in harsh industrial environments
• Optimized thread engagement with Class 2A UNC coarse threads ensuring secure fastening and reduced cross-threading risks
• Enhanced installation efficiency featuring external hex drive and 2" head width for superior torque application and tool compatibility
• Controlled partial threading with 2" threaded section and 1" grip length providing precise clamping force distribution
• Rigorous quality assurance meeting ASTM A325, ASTM F3125, and ASME B18.2.6 specifications for consistent performance
• Environmental compliance with RoHS 3 and REACH regulations ensuring safe usage across global markets

Professional Applications & Engineering Value

Engineered for demanding structural connections, these Grade A325 heavy-duty hex head screws deliver critical performance where failure is not an option. The hot-dipped galvanized steel construction provides exceptional protection against environmental degradation, making them ideal for construction, bridgework, and industrial machinery applications exposed to moisture and chemical agents. The 1 1/4"-7 UNC coarse thread configuration ensures rapid installation and superior vibration resistance, while the partially threaded design concentrates clamping force precisely where needed. With Rockwell C19 hardness and verified compliance with major industrial standards, these external hex drive bolts offer engineers reliable solutions for critical structural joints requiring both high tensile strength and long-term corrosion resistance.

Specification Summary & Compliance

These heavy-duty hex head screws feature precision Class 2A thread fit with 1 1/4"-7 UNC coarse threads and right-hand thread direction. Manufacturing complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming restricted substance adherence. The 3" overall length with 2" thread length and 1" grip length provides optimized fastening geometry for structural applications.