S-91571A302 3/4"-10 x 3 1/4" 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 heavy-duty structural connections
- Superior wear resistance due to Rockwell C19 hardness, ensuring extended service life in demanding environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster installation and reduced cross-threading risks
- Secure torque transmission through the external hex drive design, compatible with standard industrial tools
- Controlled clamping force distribution with partial threading and 1 7/8" grip length for precise joint integrity
- Full regulatory compliance meeting RoHS 3 and REACH environmental standards for global project suitability
- Industry-standard compatibility manufactured to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications
Professional Applications & Engineering Value
This Grade A325 heavy-duty hex head screw delivers critical engineering solutions for structural steel connections, heavy machinery assembly, and construction applications where vibration resistance and high tensile strength are paramount. The steel construction with Rockwell C19 hardness provides exceptional durability against dynamic loads and environmental stressors. The 3/4"-10 UNC coarse thread configuration ensures rapid installation in thick materials while maintaining Class 2A thread fit precision for consistent clamping force. The partially threaded design concentrates stress away from the shank-to-head transition zone, significantly reducing the risk of fatigue failure in industrial fastening applications subjected to cyclic loading conditions.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.6 dimensional standards with Class 2A thread fit tolerances for consistent engagement. This hex head screw complies with material specifications ASTM A325 and ASTM F3125 for high-strength structural bolting. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting the latest environmental regulations for hazardous substance restrictions. Critical dimensions include 3 1/4" total length, 1 7/8" grip length, and 1 1/4" head width for standardized wrench compatibility.
