S-91571A425 5/8"-11 x 7 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 load-bearing capacity with 120,000 psi tensile strength, ideal for high-stress structural connections
• Superior durability and wear resistance thanks to Rockwell C19 hardness steel construction
• Reliable grip and vibration resistance from partial threading and 6 1/4" grip length
• Easy installation and removal with external hex drive and coarse UNC threads
• Precise thread fit with Class 2A tolerance ensuring consistent performance
• Compliance with major industry standards including ASME B18.2.6 and ASTM A325 for guaranteed quality
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable operations

Professional Applications & Engineering Value

This Grade A325 hex head screw delivers critical engineering value in structural steel applications where failure is not an option. The 5/8"-11 UNC coarse thread design provides excellent engagement in steel frameworks, while the partial threading ensures optimal clamp force distribution across connected members. Manufactured from high-strength steel with Rockwell C19 hardness, it withstands dynamic loads and vibration in demanding environments like bridge construction, industrial framing, and heavy equipment assembly. The external hex drive allows for high-torque installation with standard tools, making it ideal for both field and factory applications requiring heavy-duty fastening solutions.

Specification Summary & Compliance

This fastener features Class 2A thread fit per UNC standards with precise dimensional accuracy. Manufacturing complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring responsible material sourcing and manufacturing practices.