S-91583A223 7/8"-9 x 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 heavy-duty structural applications
- Superior corrosion resistance from hot-dipped galvanized steel construction, extending service life in harsh environments
- Optimized thread engagement with UNC coarse threads and Class 2A fit for faster installation and reduced cross-threading risks
- High hardness rating of Rockwell C19 ensures excellent wear resistance and durability under repeated stress
- Secure external hex drive provides positive torque transmission and prevents tool slippage during installation
- Partial threading design offers superior clamping force control in structural connections
- Full regulatory compliance with RoHS 3 and REACH ensures environmental responsibility and global market acceptance
Professional Applications & Engineering Value
Engineered for demanding structural applications, these Grade A325 hex head screws deliver critical performance where failure is not an option. The hot-dipped galvanized steel construction provides a robust barrier against corrosion, making them ideal for outdoor structures, bridges, and industrial facilities exposed to weather elements. The 7/8"-9 UNC coarse thread configuration ensures rapid installation in structural steel connections while maintaining superior clamping force. With partial threading and precise Class 2A thread fit, these fasteners prevent joint relaxation in vibration-prone environments. Meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, they provide engineers with certified reliability for critical structural bolting applications where safety and longevity are paramount.
Specification Summary & Compliance
These hex head screws feature precise Class 2A thread fit with 7/8"-9 UNC coarse threads and 4" length with 2 1/2" grip length. Manufactured to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, ensuring dimensional accuracy and performance consistency. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use worldwide.
