S-91257A472 3/8"-24 x 6 1/2" 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 resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Precise Class 2A thread fit ensures smooth assembly and consistent clamping force in critical connections
- Optimized partial threading provides maximum grip length while reducing weight and material usage
- Rockwell C33 hardness rating maintains structural integrity under repeated loading and vibration
- External hex drive design enables high-torque installation with standard tools for efficient maintenance
- Fine UNF thread profile delivers enhanced resistance to loosening in dynamic applications
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance where structural integrity cannot be compromised. The 150,000 psi tensile strength and Rockwell C33 hardness make it ideal for heavy machinery, construction equipment, and automotive assemblies subjected to extreme loads and vibration. The zinc yellow-chromate plating provides superior corrosion protection in outdoor or chemically aggressive environments, while the UNF fine thread configuration maintains secure fastening under dynamic conditions. The partial threading design optimizes the strength-to-weight ratio, making it perfect for applications requiring precise clamp load distribution across joined components in industrial manufacturing and equipment maintenance.
Specification Summary & Compliance
Manufactured to ASME B18.2.1/SAE J429 specifications with Class 2A thread fit tolerance for precision assembly. The 3/8"-24 UNF fine thread maintains consistent engagement while the 6 1/2" length with 1 1/4" minimum thread length provides versatile fastening solutions. Fully compliant with RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use across various industrial sectors.
