S-91286A227 3/8"-16 x 4 3/4" 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 high-stress applications
- Superior corrosion resistance through zinc-flake coating, extending service life in harsh industrial environments
- Optimized torque transmission with external hex drive design for secure installation and removal
- Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
- Precise thread engagement with Class 2A thread fit ensuring consistent fastening performance
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for industrial applications requiring maximum reliability. The 3/8"-16 UNC coarse thread configuration provides excellent vibration resistance in heavy machinery, construction equipment, and structural assemblies. The zinc-flake coated surface treatment offers superior protection against corrosion in demanding environments, while the partially threaded design allows for both secure fastening and precise component alignment. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains integrity under extreme mechanical stress, making it ideal for critical joints in manufacturing, automotive, and infrastructure projects where failure is not an option.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 3/8"-16 UNC coarse threading according to ASME B18.2.1 specifications. This Grade 8 fastener complies with SAE J429 standards and features zinc-flake coating for enhanced corrosion protection. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors while maintaining the highest quality standards for professional applications.
