S-91583A130 1/2"-13 x 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 demanding structural applications
• Superior corrosion protection through hot-dipped galvanized steel construction, extending service life in harsh environments
• Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring secure fastening and vibration resistance
• Heavy-duty construction compatibility meeting Grade A325 specifications for structural steel connections and industrial assemblies
• Enhanced installation efficiency featuring external hex drive and 7/8" head width for secure tool engagement and torque application
• Versatile partial threading design with 3" grip length providing optimal clamp force distribution in multi-material connections
• Regulatory compliance assurance with RoHS 3 and REACH compliance for global industrial applications

Professional Applications & Engineering Value

Engineered for structural steel connections and heavy machinery assemblies, these Grade A325 hex head screws deliver critical performance where vibration resistance and structural integrity are paramount. The hot-dipped galvanized steel construction provides superior barrier protection against environmental corrosion, significantly extending maintenance intervals in outdoor construction and industrial settings. The combination of UNC coarse threads and Class 2A thread fit ensures rapid installation while maintaining precise tolerances for load distribution. The partially threaded design with substantial 1" thread length and 3" grip length allows for optimal clamp force in multi-layer assemblies, preventing joint relaxation under dynamic loads. These heavy-duty hex bolts are specifically designed to withstand the rigorous demands of bridge construction, structural framing, and heavy equipment manufacturing.

Specification Summary & Compliance

Manufactured to exacting ASME B18.2.6, ASTM A325, and ASTM F3125 standards, these fasteners guarantee dimensional consistency and mechanical performance. The Class 2A thread fit provides controlled clearance for efficient assembly while maintaining structural integrity. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and global market acceptance. The Rockwell C19 hardness rating confirms proper heat treatment and material consistency, supporting the specified 120,000 psi tensile strength for structural applications requiring certified Grade A325 performance.