S-91257A776 9/16"-12 x 5 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 load-bearing capacity with 150,000 psi tensile strength, ideal for high-stress industrial assemblies.
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments.
- High hardness rating of Rockwell C33 ensures minimal wear and deformation under heavy use.
- Reliable coarse thread engagement with UNC 9/16"-12 threading for faster installation and reduced cross-threading risk.
- Optimized partial threading allows for precise clamping force control in demanding applications.
- External hex drive design facilitates easy installation and removal with standard tools.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and performance.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, structural steel connections, and industrial equipment assembly. The steel material combined with Rockwell C33 hardness provides exceptional resistance to shear and tensile forces, preventing joint failure in dynamic load conditions. The zinc yellow-chromate finish offers robust protection against oxidation and chemical exposure, making it suitable for outdoor and corrosive environments. Its 9/16"-12 UNC coarse thread ensures quick, secure fastening in structural applications, while the partial threading design allows engineers to concentrate clamping force exactly where needed, reducing stress concentration and improving fatigue resistance in critical bolted joints.
Specification Summary & Compliance
This fastener features Class 2A thread fit for consistent assembly tolerance and meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations for industrial use worldwide.
