S-91257A462 3/8"-24 x 3 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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 that extends service life in demanding environments
- Precise thread engagement with Class 2A fit and UNF fine thread spacing for vibration resistance and secure fastening
- Optimized torque transmission via external hex drive design that prevents tool slippage during installation
- Enhanced durability with Rockwell C33 hardness that maintains structural integrity under repeated stress
- Controlled thread engagement through partial threading that prevents over-tightening in critical assemblies
- Industry-standard compliance meeting ASME B18.2.1 specifications for guaranteed dimensional accuracy and performance
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural frameworks, and industrial equipment where high tensile strength and vibration resistance are paramount. The steel construction with zinc yellow-chromate plating provides superior protection against corrosion in harsh operating environments, while the UNF fine thread spacing and Class 2A thread fit ensure precise alignment and secure fastening in critical assemblies. The partial threading design prevents over-tightening and distributes stress evenly, making it ideal for applications requiring controlled clamp load. These industrial hex screws are engineered to maintain integrity under extreme conditions, reducing maintenance frequency and downtime in manufacturing, construction, and automotive applications.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 standards with Class 2A thread fit tolerance for precision engagement. The 3/8"-24 UNF fine thread configuration ensures optimal performance in vibration-prone applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting international safety and sustainability requirements for industrial components.
