S-91571A349 1 1/8"-7 x 5" 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 105,000 psi tensile strength for reliable performance in heavy-duty structural connections
- Superior hardness and durability with Rockwell C19 rating to resist deformation under extreme pressure and vibration
- Optimized thread engagement through coarse UNC threading and Class 2A fit for faster installation and reduced cross-threading risks
- Secure anti-rotation performance with external hex drive and large 1 13/16" head width for maximum torque application
- Precise load distribution with 3" grip length and partial threading design for concentrated clamping force where needed
- Full regulatory compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for guaranteed quality and safety
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for sustainable industrial operations
Professional Applications & Engineering Value
Engineered for critical structural applications, these Grade A325 hex head screws deliver exceptional performance in heavy-duty fastening scenarios. The steel construction combined with Rockwell C19 hardness provides superior resistance to shear forces and vibration-induced loosening, making them ideal for structural steel connections, bridge construction, and industrial machinery assembly. The coarse UNC threading and Class 2A thread fit ensure rapid installation in thick materials while maintaining precise tolerance control. With partial threading and substantial 3" grip length, these screws concentrate clamping force exactly where needed, preventing joint slippage in high-stress environments. The external hex drive design accommodates standard industrial tools for efficient installation and removal in confined spaces.
Specification Summary & Compliance
This Grade A325 hex head screw features precise Class 2A thread fit with 1 1/8"-7 UNC coarse threading and partial threading configuration. Manufacturing complies with ASME B18.2.6 dimensional standards and material specifications per ASTM A325 and ASTM F3125. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring full environmental regulatory adherence for industrial applications.
