S-91571A447 1"-8 x 3 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 structural integrity with 120,000 psi tensile strength and Rockwell C19 hardness for reliable performance in demanding applications
- Superior load distribution through partial threading design that provides optimal grip length for secure connections
- Precise thread engagement with Class 2A thread fit ensuring consistent installation and reduced risk of cross-threading
- Enhanced installation efficiency with external hex drive and 1 5/8" head width for easy tool access and high torque application
- Long-term corrosion resistance through high-quality steel construction meeting industrial durability requirements
- Reliable coarse threading (1"-8 UNC) that resists loosening under vibration and provides quick assembly in structural applications
- Comprehensive regulatory compliance with RoHS 3 and REACH environmental standards for safe, sustainable usage
Professional Applications & Engineering Value
Engineered for structural steel connections and heavy-duty industrial applications, these Grade A325 hex head screws deliver critical performance where failure is not an option. The high-strength steel construction combined with Rockwell C19 hardness provides exceptional resistance to shear and tensile forces, making them ideal for construction projects, bridge work, and structural framing. The partially threaded design ensures that the unthreaded shank bears against connected materials, preventing joint slippage under dynamic loads. With 1"-8 UNC coarse threading, these fasteners offer superior resistance to vibration loosening while enabling rapid installation in time-sensitive projects. The external hex drive configuration allows for high-torque application with standard tools, streamlining assembly processes in confined spaces.
Specification Summary & Compliance
These heavy-duty hex head screws feature precise Class 2A thread fit with 1"-8 UNC coarse thread specifications, ensuring dimensional accuracy and reliable performance. Manufacturing complies with ASME B18.2.6, ASTM A325, and ASTM F3125 standards for structural bolting applications. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to current substance restriction requirements for industrial use.
