S-92620A242 5/16"-24 x 7 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc yellow-chromate plating extends service life in harsh industrial environments.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loads.
- Fine UNF threading with Class 2A fit offers precise engagement and vibration resistance, maintaining joint integrity.
- Partially threaded design allows for controlled clamping force and secure fastening in specific assembly setups.
- External hex drive and hex head facilitate easy installation and removal with standard tools, improving assembly efficiency.
- Compliance with ASME B18.2.1 and SAE J429 ensures consistent quality and interoperability in regulated industries.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, construction equipment, and automotive systems. The steel material combined with a zinc yellow-chromate finish provides robust protection against corrosion and oxidation, extending component life in demanding environments. The 5/16"-24 UNF fine thread and Class 2A thread fit deliver precise, secure fastening that resists loosening under vibration, a common issue in dynamic operations. With a partial threading design, it allows for optimal load distribution, reducing stress concentrations and enhancing joint reliability. Ideal for high-strength bolting where durability and compliance with industry standards are paramount, this fastener ensures long-term performance and safety in critical engineering projects.
Specification Summary & Compliance
This product adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and a UNF fine thread specification. It meets manufacturing standards such as ASME B18.2.1 and SAE J429 for quality assurance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.
