S-91257A741 1/2"-13 x 8 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 industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh environments, minimizing maintenance and replacement costs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under heavy loads and vibration.
- Coarse UNC threading with Class 2A fit allows for quick assembly and secure fastening, improving installation efficiency.
- Partially threaded design offers optimal grip and clamping force distribution, preventing joint loosening in dynamic applications.
- External hex drive and standard head dimensions ensure compatibility with common tools, facilitating easy installation and removal.
- Full compliance with industry standards (ASME B18.2.1, SAE J429) guarantees consistent quality and interoperability in mechanical systems.
Professional Applications & Engineering Value
Engineered for demanding environments, this Grade 8 hex head screw combines high-strength steel construction with a zinc yellow-chromate plating to combat corrosion in outdoor or chemically exposed settings. The 1/2"-13 UNC coarse thread and Class 2A thread fit provide rapid, secure fastening in structural assemblies, machinery, and heavy equipment, reducing installation time while maintaining joint integrity. Its partial threading ensures concentrated clamping force, making it ideal for applications where vibration resistance is critical. By meeting ASME B18.2.1 and SAE J429 specifications, it delivers reliable performance in construction, automotive, and industrial manufacturing, addressing common issues like fatigue and environmental degradation.
Specification Summary & Compliance
This fastener adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and UNC coarse threading per industry standards. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring mechanical reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations in global supply chains.
