S-91247A518 7/8"-14 x 8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 capability with 120,000 PSI tensile strength, ideal for structural and heavy machinery applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Optimized torque transmission via external hex drive and large 1 5/16" head width for easy installation with standard tools
- Controlled thread distribution with partial threading providing enhanced grip in specific load-bearing sections
- Certified material integrity meeting Grade 5 standards with Rockwell C25 hardness for consistent performance
- Regulatory compliance assurance with RoHS 3 and REACH standards for safe use across international markets
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 5 hex head screw addresses critical challenges in construction, machinery assembly, and structural frameworks. The zinc plated steel construction provides essential corrosion protection in environments exposed to moisture and chemicals, while the 7/8"-14 UNF fine thread configuration delivers superior clamping force and vibration resistance compared to coarse thread alternatives. The partially threaded design concentrates strength where needed most, preventing thread damage during installation and maintaining 120,000 PSI tensile strength under extreme loads. With its external hex drive and substantial head dimensions, installation efficiency is maximized while reducing the risk of tool slippage and fastener deformation during high-torque applications.
Specification Summary & Compliance
This 8" hex head screw features precise Class 2A thread fit tolerances and UNF fine threading per standardized dimensions. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, confirming suitability for regulated industrial markets and international supply chains.
