S-91268A187 5/16"-18 x 1" 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, reducing the risk of fastener failure.
- Superior hardness (Rockwell C33) provides excellent wear resistance and durability, extending the service life of your assemblies.
- Fully threaded UNC coarse design allows for faster installation and superior grip in a wide range of materials, improving assembly efficiency.
- Precise Class 2A thread fit ensures smooth engagement and consistent clamping force, minimizing the chance of cross-threading.
- External hex drive and hex head offer high torque capability and easy access with standard tools, speeding up maintenance and installation.
- Compliance with ASME B18.2.1 and SAE J429 guarantees consistent quality and interchangeability, reducing procurement and compatibility issues.
- RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global industrial use.
Professional Applications & Engineering Value
This Grade 8 steel hex head screw is engineered to address critical challenges in heavy-duty industrial environments, such as machinery, automotive, and construction assemblies. The high tensile strength and Rockwell C33 hardness prevent deformation under extreme loads, while the 5/16"-18 UNC coarse thread provides robust holding power in coarse-grained materials. The fully threaded and external hex drive design allows for uniform stress distribution and easy installation with common wrenches, reducing assembly time and enhancing structural integrity in demanding applications where vibration and high pressure are concerns.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy. It meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent manufacturing quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.
