S-91583A250 1"-8 x 5 1/2" 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 classification and 120,000 psi tensile strength for reliable performance in heavy-load applications
• Superior corrosion protection through hot-dipped galvanized steel construction, 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 drive efficiency featuring external hex head design for high-torque installation using standard tools
• Controlled flexibility with partial threading and 3 3/4" grip length providing precise clamp load distribution
• Industry compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for quality consistency
• Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications

Professional Applications & Engineering Value

Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws deliver critical performance where vibration resistance and structural integrity are paramount. The hot-dipped galvanized steel construction provides a sacrificial zinc coating that offers superior protection against rust and corrosion in outdoor or chemically aggressive environments. With 1"-8 UNC coarse threading and Class 2A thread fit, these fasteners ensure rapid installation while maintaining precise tolerances. The partially threaded design concentrates strength in the shank while allowing for controlled clamping force. These characteristics make them ideal for construction applications, bridge work, and industrial equipment manufacturing where reliability cannot be compromised.

Specification Summary & Compliance

This 1"-8 UNC hex head screw maintains Class 2A thread tolerances with coarse thread spacing for optimal engagement. Manufacturing adheres to ASME B18.2.6 dimensional specifications and ASTM A325/ASTM F3125 material standards. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. Mechanical properties include Rockwell C19 hardness and verified 120,000 psi tensile strength consistent with Grade A325 requirements for structural applications.