S-91257A445 5/16"-24 x 5" 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
- Maximum Load-Bearing Capacity with Grade 8 classification and 150,000 PSI tensile strength for critical structural applications
- Superior Corrosion Protection through zinc yellow-chromate plating that withstands harsh industrial environments
- Precise Thread Engagement with Class 2A thread fit and UNF fine threads ensuring vibration-resistant connections
- Optimized Torque Transmission via external hex drive design that prevents tool slippage during installation
- Enhanced Durability with Rockwell C33 hardness maintaining structural integrity under repeated stress
- Versatile Partial Threading allowing both clamping and alignment functions in assembly operations
- Regulatory Compliance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in construction equipment, machinery frames, and structural assemblies where high tensile strength and vibration resistance are critical. The 5/16"-24 UNF fine thread configuration provides superior clamping force distribution, while the zinc yellow-chromate plating offers enhanced corrosion protection in demanding environments. The partial threading design allows for precise adjustment and secure fastening in applications requiring both alignment and clamping functions. These external hex drive screws ensure reliable torque transmission during installation, reducing the risk of fastener failure in high-stress applications.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF thread standards ensuring precise engagement. The 5/16"-24 thread size with 7/8" minimum thread length provides optimal fastening performance. Compliant with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for safe industrial use worldwide.
