S-91583A124 1/2"-13 x 2 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 structural integrity with Grade A325 classification and 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion protection through hot-dipped galvanized steel construction, extending service life in harsh environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and easier installation
- Enhanced torque transmission via external hex drive and 7/8" head width for straightforward installation with standard tools
- Versatile partial threading design providing both gripping strength and adjustment flexibility in structural connections
- Consistent hardness performance with Rockwell C19 rating maintaining dimensional stability under heavy loads
- Proven compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125
Professional Applications & Engineering Value
These Grade A325 hex head structural screws deliver critical performance where failure is not an option. The hot-dipped galvanized steel construction provides a sacrificial zinc coating that offers superior protection against rust and corrosion, making these fasteners ideal for outdoor structures, bridges, and industrial facilities exposed to weather elements. The partially threaded design creates a defined shear plane while allowing the unthreaded shank to bear against connected materials, preventing joint loosening under vibration. With UNC coarse threading and Class 2A thread fit, these screws install quickly without cross-threading concerns, reducing assembly time in steel construction, heavy equipment manufacturing, and structural framing applications where time and reliability are paramount.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC 1/2"-13 coarse threading. These structural screws conform to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures these fasteners meet the latest international standards for restricted substances.
