S-92620A282 1 1/4"-12 x 8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
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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 150,000 psi tensile strength, ideal for heavy-duty structural connections
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Precise thread engagement with Class 2A UNF fine threads for reliable vibration resistance and secure fastening
- Optimized torque transmission via external hex head design (1 7/8" width) for easy installation with standard tools
- Enhanced material integrity with Rockwell C33 hardness and Grade 8 certification, preventing shear failure under extreme stress
- Reduced assembly weight through partial threading while maintaining full strength across the 8" shank length
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance in heavy machinery, structural steel framing, and industrial equipment where vibration resistance and long-term reliability are paramount. The UNF fine threading (1 1/4"-12) maintains clamping force under dynamic loads, while the zinc yellow-chromate finish provides sacrificial protection against chemical exposure and atmospheric corrosion. Engineered with partial threading on an 8" length, it eliminates unnecessary thread engagement points where full strength isn't required, reducing stress concentration. The external hex drive and substantial head dimensions ensure sufficient torque application without stripping, making it ideal for bolted connections requiring periodic maintenance or disassembly in construction, mining, and transportation equipment.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 specifications with Class 2A thread fit tolerances. The right-hand UNF fine threads maintain precise engagement while the Rockwell C33 hardness ensures consistent performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for international industrial applications.
