S-91257A638 3/8"-16 x 3 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 demanding industrial applications
- Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh environments
- Reliable fastening performance with Class 2A thread fit ensuring precise engagement and vibration resistance
- Optimized torque transmission via external hex drive design for secure installation and removal
- Enhanced durability from Grade 8 steel construction with Rockwell C33 hardness for long service life
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards and RoHS 3/REACH requirements
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and corrosion resistance are paramount. The 3/8"-16 UNC coarse threads with Class 2A fit provide rapid installation and secure fastening in high-vibration environments, while the partial threading design offers optimal clamp load distribution. The zinc yellow-chromate plated finish creates a protective barrier against oxidation and chemical exposure, extending service life in demanding conditions. Manufactured from high-strength steel and meeting ASME B18.2.1 and SAE J429 specifications, this fastener ensures reliability in construction, automotive, and manufacturing applications where failure is not an option.
Specification Summary & Compliance
This 3/8"-16 UNC hex head screw features Class 2A thread fit tolerance with coarse thread spacing and partial threading over a minimum 1" length. The fastener maintains dimensional accuracy per ASME B18.2.1 specifications and meets SAE J429 Grade 8 requirements for mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and restricted substance adherence for global industrial applications.
