S-91286A367 1/2"-20 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc-flake coating, extending service life in harsh environments
- Precise thread engagement with Class 2A fit and UNF fine threads for vibration-resistant connections
- Exceptional durability from Grade 8 steel and Rockwell C33 hardness for repeated use
- High-torque installation capability with external hex drive and 3/4" head width
- Full-thread design ensuring consistent clamping force along the entire 1" length
- Regulatory compliance meeting ASME, SAE, RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value for heavy-duty industrial applications where failure is not an option. The combination of high-strength steel and zinc-flake coating addresses critical challenges in machinery, construction, and automotive assemblies exposed to corrosive environments and extreme loads. The UNF fine thread configuration provides superior resistance to vibration loosening compared to coarse threads, while the external hex drive allows for high-torque installation in confined spaces. These fully threaded fasteners maintain consistent clamping force across the entire engagement length, making them ideal for critical joints in structural frameworks, heavy equipment, and high-stress mechanical systems where reliability and compliance with ASME B18.2.1 and SAE J429 standards are paramount.
Specification Summary & Compliance
This 1/2"-20 UNF hex head screw features precise Class 2A thread fit tolerances and fully threaded design with right-hand thread direction. Manufactured to exacting ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, it delivers 150,000 psi tensile strength and Rockwell C33 hardness. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global acceptance for industrial applications.
