S-91571A309 3/4"-10 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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in heavy structural connections
- Superior hardness and durability with Rockwell C19 rating to resist deformation under extreme stress conditions
- Optimized clamping force distribution through partial threading and 3 1/8" grip length for secure joint integrity
- Precision thread engagement with Class 2A UNC coarse threads ensuring easy installation and vibration resistance
- Industry-standard compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for guaranteed quality
- Enhanced installation efficiency with external hex drive design allowing high-torque application with standard tools
- Environmental responsibility through RoHS 3 and REACH compliance for sustainable industrial applications
Professional Applications & Engineering Value
This Grade A325 heavy-duty hex head screw addresses critical structural challenges in industrial construction and engineering applications. The steel construction with Rockwell C19 hardness provides exceptional resistance to shear and tensile stresses, while the partially threaded design concentrates clamping force precisely where needed. The UNC coarse thread pattern ensures rapid installation and superior resistance to vibration loosening in structural steel connections, bridge construction, and heavy machinery assembly. With its 3/4"-10 thread size and external hex drive, this fastener delivers reliable performance in high-stress environments where joint integrity is paramount, making it an ideal solution for critical structural applications requiring predictable, repeatable performance.
Specification Summary & Compliance
This structural fastener features Class 2A thread fit tolerance for precise engagement and meets ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing standards. The 3/4"-10 UNC coarse thread configuration ensures compatibility with standard industrial applications. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to the latest environmental safety standards for industrial components.
