S-91583A145 5/8"-11 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 120,000 psi tensile strength for reliable performance in demanding structural applications
• Superior corrosion resistance through hot-dipped galvanized steel coating, extending service life in harsh environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced installation efficiency featuring external hex drive and 1 1/16" head width for easy tool access and high torque application
• Proven structural reliability meeting Grade A325 specifications for heavy-duty construction and industrial applications
• Partial threading design providing 1-3/4" grip length for precise clamping force distribution in connected materials
• Regulatory compliance assurance with RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws deliver critical performance where failure is not an option. The hot-dipped galvanized steel construction provides superior protection against environmental degradation, significantly extending maintenance intervals in outdoor or corrosive environments. The UNC coarse thread profile ensures rapid installation and reliable performance in structural steel applications, while the partial threading design concentrates clamping force precisely where needed. These industrial fasteners are specifically engineered to maintain integrity under dynamic loads and vibration, making them ideal for bridge construction, structural frameworks, and heavy equipment manufacturing where 120,000 psi tensile strength and consistent performance are paramount.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with 5/8"-11 UNC coarse threading and right-hand thread direction. Complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for dimensional accuracy and mechanical properties. Features Rockwell C19 hardness and meets all requirements for Grade A325 structural bolts. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring responsible manufacturing practices and material safety.