S-91257A825 5/8"-11 x 9 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 for reliable performance in the most demanding applications.
- Superior corrosion resistance provided by the zinc yellow-chromate plating, extending service life in harsh industrial environments.
- High-strength Grade 8 classification and Rockwell C33 hardness ensure durability and resistance to wear and stripping.
- Secure and easy installation with an external hex drive and 15/16" head width, allowing for high torque application.
- Reliable coarse UNC threading and Class 2A thread fit enable quick assembly and strong holding power.
- Versatile partial threading design provides a non-threaded shank for precise clamping in structural connections.
- Full compliance with industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered for heavy-duty industrial applications where failure is not an option. Its high tensile strength and Rockwell C33 hardness make it ideal for critical structural assemblies, heavy machinery, and construction equipment, preventing joint failure under extreme stress. The zinc yellow-chromate plating offers robust protection against corrosion, significantly reducing maintenance needs in outdoor or chemically aggressive environments. The coarse UNC thread and Class 2A fit ensure rapid, secure fastening even in vibrating applications, while the partially threaded design provides an unthreaded bearing surface for accurate load distribution. This screw delivers reliable performance in demanding sectors like manufacturing, automotive, and infrastructure.
Specification Summary & Compliance
This fastener features a 5/8"-11 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in compliance with ASME B18.2.1 and SAE J429 specifications for dimensional consistency and mechanical properties. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for industrial use.
