S-91583A217 7/8"-9 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 corrosion resistance with hot-dipped galvanized steel coating for long-term durability in harsh environments
- Superior structural integrity with Grade A325 classification and 120,000 psi tensile strength for heavy-load applications
- Optimized thread engagement through 7/8"-9 UNC coarse threading and Class 2A fit for reliable installation
- Enhanced torque transmission with external hex drive and 1 7/16" head width for secure fastening
- Precise load distribution with 2" grip length and partial threading for controlled clamping force
- Industry compliance assurance meeting ASME, ASTM, RoHS 3, and REACH standards for regulatory confidence
- Consistent performance with Rockwell C19 hardness rating ensuring dimensional stability under stress
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical performance in structural steel construction, bridge building, and heavy machinery assembly where failure is not an option. The hot-dipped galvanized steel construction provides superior protection against environmental corrosion, while the 7/8"-9 UNC coarse threading ensures rapid installation and reduced cross-threading risks in field applications. The partial threading design concentrates stress away from the shank-to-thread transition zone, preventing premature failure in dynamic load conditions. Engineered to withstand extreme vibration and tensile loads, these heavy-duty fasteners maintain joint integrity in critical connections where safety and reliability are paramount.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 7/8"-9 UNC coarse thread specifications. Compliant with ASME B18.2.6, ASTM A325, and ASTM F3125 structural bolt standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features include 3 1/2" overall length, 2" grip length, and external hex drive configuration for standardized tool compatibility across industrial applications.
