S-91571A424 5/8"-11 x 7" 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 tensile strength of 120,000 psi ensures reliable performance in the most demanding structural and heavy machinery applications
• Superior material hardness (Rockwell C19) provides excellent resistance to wear, deformation, and shear forces under extreme loads
• Coarse UNC threading with Class 2A fit enables faster installation and superior vibration resistance in structural steel connections
• Partially threaded design creates a precise clamping zone for controlled tensioning in bolted joint assemblies
• External hex drive configuration delivers maximum torque transmission and tool compatibility for efficient installation
• Full compliance with industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125 ensures consistent quality and engineering reliability
• Environmental regulation compliance with RoHS 3 and REACH makes these screws suitable for global industrial applications

Professional Applications & Engineering Value

These Grade A325 hex head screws deliver critical engineering value in structural steel construction, heavy machinery assembly, and industrial equipment manufacturing. The combination of high-strength steel material and 5/8"-11 UNC coarse threading addresses common challenges in vibration-prone environments, where maintaining joint integrity is paramount. The partially threaded configuration ensures that the unthreaded shank bears against connected materials, providing superior shear strength while the threaded portion enables precise clamping force control. With external hex drive compatibility, these screws integrate seamlessly with standard industrial tools, streamlining installation in time-sensitive construction and manufacturing operations where reliability cannot be compromised.

Specification Summary & Compliance

This 5/8"-11 UNC hex head screw features precise Class 2A thread fit tolerances and partial threading with 1-1/4" thread length. Manufactured to exacting ASME B18.2.6 specifications and certified to ASTM A325/ASTM F3125 standards for structural bolting applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial markets and environmentally conscious manufacturing operations.