S-91257A476 3/8"-24 x 8" 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loading conditions.
- Precision Class 2A thread fit with UNF fine threading offers secure, vibration-resistant connections in critical assemblies.
- Partially threaded design allows for optimal clamping force distribution while maintaining structural integrity.
- External hex drive compatibility enables quick installation and removal with standard tools, improving assembly efficiency.
- Compliance with ASME B18.2.1 standards guarantees consistent quality and interchangeability for engineering projects.
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering value through its high-strength steel construction and zinc yellow-chromate plating, specifically engineered to address common industrial challenges. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures reliable performance in heavy machinery, structural steel connections, and equipment subjected to dynamic loads. The 3/8"-24 UNF fine thread configuration provides superior resistance to vibration loosening, while the partially threaded design concentrates clamping force where needed most. These industrial screws are particularly valuable in construction, manufacturing, and automotive applications where corrosion resistance and long-term durability are essential for maintaining operational safety and reducing downtime.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance according to UNF thread standards with precise dimensional accuracy. Manufacturing complies with ASME B18.2.1 specifications and SAE J429 standards for Grade 8 fasteners, ensuring consistent quality and performance. The product meets industry requirements for heavy-duty applications with verified material properties and dimensional conformance.
