S-91257A792 9/16"-18 x 4 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, preventing fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh or outdoor environments.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under heavy loads.
- Precise Class 2A thread fit allows for smooth assembly and secure fastening with reduced risk of cross-threading.
- Partially threaded design offers optimal grip and clamping force where full threading isn't required.
- External hex drive and hex head facilitate easy installation and removal with standard tools, improving maintenance efficiency.
- Compliance with industry standards including ASME B18.2.1 guarantees consistent quality and interchangeability.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these Grade 8 hex head screws deliver robust performance in construction, machinery, and heavy equipment applications. The 9/16"-18 UNF fine thread configuration ensures superior vibration resistance and precise tension control, critical in dynamic load conditions. Made from high-strength steel and finished with zinc yellow-chromate plating, they effectively combat corrosion, reducing maintenance frequency and downtime. The partially threaded shank design concentrates clamping force exactly where needed, preventing joint loosening in structural assemblies. Ideal for use in automotive, agricultural, and manufacturing sectors where high tensile strength and reliability are non-negotiable.
Specification Summary & Compliance
This fastener features Class 2A thread fit per UNF standards, ensuring dimensional accuracy and compatibility. It meets ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, confirming adherence to rigorous manufacturing norms. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence.
