S-91286A305 7/16"-20 x 2 3/4" 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 for reliable performance in high-stress applications
- Superior corrosion protection through zinc-flake coating that extends service life in harsh industrial environments
- Precise thread engagement with UNF fine thread and Class 2A fit ensuring vibration resistance and secure fastening
- Optimized torque transmission via external hex drive design that prevents tool slippage during installation
- Enhanced durability from Rockwell C33 hardness that maintains structural integrity under repeated stress
- Versatile partial threading allowing both clamping and alignment functions in complex assemblies
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural frameworks, and equipment requiring high tensile strength fastening. The zinc-flake coated steel construction addresses corrosion challenges in manufacturing plants, automotive assemblies, and outdoor installations where environmental exposure compromises fastener integrity. The UNF fine thread configuration provides superior resistance to vibrational loosening compared to coarse threads, while the partial threading design allows precise adjustment in applications requiring both clamping force and alignment capability. Engineered to ASME B18.2.1 and SAE J429 specifications, this fastener ensures dimensional consistency and interchangeability across industrial systems, reducing maintenance downtime and replacement costs.
Specification Summary & Compliance
This 7/16"-20 hex head screw features Class 2A thread fit tolerances per UNF standards with 2 3/4" length and 1 1/8" minimum thread length. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 requirements, ensuring dimensional accuracy and mechanical properties. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for industrial components.
