S-91571A280 5/8"-11 x 4 1/2" 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 structural integrity with 120,000 psi tensile strength for reliable performance in demanding applications
- Superior durability and corrosion resistance thanks to high-grade steel construction and Rockwell C19 hardness
- Precise Class 2A thread fit ensures smooth installation and secure fastening in coarse UNC threaded applications
- Optimized load distribution with partially threaded design and 3 1/4" grip length for enhanced structural stability
- Industry-standard compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for guaranteed quality
- Easy installation and removal with external hex drive and 1 1/16" head width for standard tool compatibility
- Environmental compliance assurance with RoHS 3 and REACH compliance for sustainable industrial use
Professional Applications & Engineering Value
This Grade A325 hex head screw delivers critical engineering value in structural applications where failure is not an option. The combination of high-strength steel material and UNC coarse threading provides superior resistance to vibration loosening and structural fatigue, making it ideal for heavy-duty construction, bridge building, and industrial framework assembly. The partially threaded design ensures optimal clamp load distribution while the external hex drive allows for high-torque installation with standard tools. With 120,000 psi tensile strength and precise Class 2A thread fit, this structural fastener solves common engineering challenges including joint slippage, material fatigue, and environmental degradation in demanding industrial environments.
Specification Summary & Compliance
This 5/8"-11 hex head structural screw features precise Class 2A thread fit with UNC coarse threading and meets rigorous manufacturing standards including ASME B18.2.6, ASTM A325, and ASTM F3125 specifications. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use across industrial applications. Critical dimensions include 1 1/4" thread length, 4 1/2" overall length, and 1 1/16" hex head width for consistent performance in structural fastening systems.
