S-91257A646 3/8"-16 x 5 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 critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh industrial environments
- Optimized thread engagement with Class 2A thread fit ensuring reliable assembly and vibration resistance
- Enhanced durability from Rockwell C33 hardness providing excellent wear resistance and longevity
- Secure installation with external hex drive design allowing high torque application without stripping
- Versatile partial threading enabling both clamping and alignment functions in heavy machinery
- Regulatory compliance meeting ASME B18.2.1, SAE J429 standards for quality assurance
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial settings where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion protection for outdoor equipment, machinery, and structural assemblies exposed to moisture and chemicals. The 3/8"-16 UNC coarse thread configuration ensures rapid installation and reliable performance in high-vibration environments, while the partial threading design allows for precise clamping force distribution. With 150,000 psi tensile strength and Rockwell C33 hardness, these industrial screws maintain integrity under extreme loads, making them ideal for heavy equipment, construction machinery, and automotive applications where safety and reliability are paramount.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (3/8"-16) and partial threading configuration. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance standards. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements.
