S-91583A604 1/2"-13 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 demanding structural applications
- Superior corrosion resistance through hot-dipped galvanized steel construction, extending service life in harsh environments
- Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring secure fastening and vibration resistance
- Enhanced installation efficiency with external hex drive and 7/8" head width for easy tool access and high torque application
- Controlled thread distribution through partial threading design providing optimal grip length for structural connections
- Industry-standard compliance meeting Grade A325 specifications for structural bolting applications
- Environmental regulation adherence with RoHS 3 and REACH compliance for global industrial use
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical engineering solutions for structural steel connections, bridge construction, and heavy machinery assembly. The hot-dipped galvanized steel construction provides a sacrificial zinc coating that offers superior protection against environmental corrosion, significantly extending maintenance intervals in outdoor or high-moisture applications. The combination of 120,000 psi tensile strength and Rockwell C19 hardness ensures reliable performance under dynamic loads and vibration, while the partial threading design concentrates threads where needed most, preventing thread stripping in critical connection points. The UNC coarse threads facilitate quicker installation and are less prone to clogging with debris compared to fine thread alternatives, making them ideal for construction sites and industrial environments where speed and reliability are paramount.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit tolerance for consistent engagement and UNC 1/2"-13 coarse thread specifications. Complies with ASME B18.2.6, ASTM A325, and ASTM F3125 structural bolting standards. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements. Dimensions include 3-1/4" length, 2-1/4" grip length, and 7/8" hex head width for standardized installation across industrial applications.
