S-91571A423 5/8"-11 x 5 3/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in high-stress structural connections
- Superior hardness and durability with Rockwell C19 rating to resist wear and deformation under heavy loads
- Optimized thread engagement through UNC coarse threading and Class 2A fit ensures secure fastening and vibration resistance
- Enhanced installation efficiency with external hex drive and 1 1/16" head width for easy tool access and torque application
- Controlled thread distribution through partial threading provides optimal grip length for precise joint clamping
- Rigorous quality assurance through compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing standards
- Environmentally responsible manufacturing with full RoHS 3 and REACH compliance for global regulatory acceptance
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical engineering solutions for structural steel connections in construction, bridge building, and heavy machinery assembly. The steel construction combined with Rockwell C19 hardness provides exceptional resistance to shear forces and dynamic loading conditions. The UNC coarse thread pattern with Class 2A fit ensures rapid installation while maintaining precise tolerance control, significantly reducing assembly time in field applications. The partially threaded design concentrates the clamping force exactly where needed, preventing joint slippage in critical structural frameworks. These heavy-duty fasteners are engineered to withstand extreme environmental conditions while maintaining their mechanical integrity throughout the service life of the structure.
Specification Summary & Compliance
This 5/8"-11 hex head screw features precise Class 2A thread fit tolerances and UNC coarse threading per industry standards. Manufacturing complies with ASME B18.2.6 dimensional specifications, ASTM A325 material requirements, and ASTM F3125 quality standards. The fastener is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring global regulatory acceptance for industrial and construction applications.
