S-91286A235 3/8"-16 x 6" 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 corrosion resistance from the zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under heavy loads.
- Class 2A thread fit with UNC coarse threading allows for easier assembly and disassembly, saving time during installation and maintenance.
- Partially threaded design offers optimal clamping force control, ideal for applications requiring precise joint security.
- External hex drive enables high-torque installation with standard tools, improving efficiency in industrial settings.
- Compliance with major standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration and dynamic loads are common. The zinc-flake coated steel construction provides a robust barrier against corrosion, significantly extending fastener life in outdoor or chemically exposed environments. With its 3/8"-16 UNC coarse thread and Class 2A fit, it ensures reliable engagement and resistance to loosening, while the partial threading allows for precise clamping in structural joints. These features make it an optimal choice for high-strength bolting applications requiring consistent performance under extreme conditions.
Specification Summary & Compliance
This fastener features a 3/8"-16 UNC thread with Class 2A dimensional accuracy and meets ASME B18.2.1 and SAE J429 manufacturing specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use across global industrial markets.
