S-91257A701 7/16"-20 x 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 industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repeated loads.
- Precision UNF fine threading with Class 2A fit offers secure, vibration-resistant connections for critical assemblies.
- Partially threaded design allows for controlled clamping force and easier alignment in structural applications.
- External hex drive enables quick installation and high torque application with standard tools, boosting efficiency.
- Compliance with industry standards (ASME B18.2.1, SAE J429) ensures consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address common industrial challenges, such as vibration loosening and environmental degradation. The steel material combined with zinc yellow-chromate plating provides a robust barrier against corrosion, making it ideal for outdoor machinery, automotive assemblies, and heavy equipment. The UNF fine thread and Class 2A thread fit ensure precise engagement, reducing the risk of cross-threading in high-precision applications. With a partially threaded shank, it offers optimal grip length for joint integrity, while the external hex drive facilitates efficient installation in confined spaces. These features make it a reliable choice for engineers seeking durability and compliance in demanding environments.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances and UNF fine thread standards per ASME B18.2.1 and SAE J429. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence for global industrial use.
