S-91571A404 1/2"-13 x 3 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-duty structural connections
- Superior hardness and durability with Rockwell C19 rating to resist deformation under extreme pressure and vibration
- Optimized thread design with 1/2"-13 UNC coarse threading for faster installation and reduced cross-threading risk
- Controlled partial threading with 1" threaded section and 2 1/2" grip length for precise clamping force distribution
- Industry-standard compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for guaranteed interchangeability
- External hex drive compatibility with 7/8" head width for standard wrench access and high-torque installation
- Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical engineering solutions for structural steel connections, heavy machinery assembly, and construction applications where vibration resistance and structural integrity are paramount. The high-strength steel composition combined with Class 2A thread fit ensures precise installation without compromising the 120,000 psi tensile strength rating. The partially threaded design with substantial 2 1/2" grip length prevents joint slippage while the coarse UNC threading maintains holding power in dynamic load conditions. These ASME B18.2.6 compliant fasteners are engineered to withstand the rigorous demands of bridge construction, structural steel framing, and industrial equipment where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with Class 2A thread fit tolerance for consistent performance. Complies with ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features 1/2"-13 UNC coarse threading with right-hand thread direction and external hex drive configuration for industry-standard installation.
