S-91257A630 3/8"-16 x 1 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh environments
- Reliable thread engagement with Class 2A fit and UNC coarse threads for easier assembly and vibration resistance
- Exceptional durability backed by Rockwell C33 hardness and Grade 8 certification for heavy-duty use
- Optimized torque transmission through external hex drive design and 9/16" head width
- Versatile partial threading allowing unthreaded shank sections for precise clamping applications
- Industry compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance where failure is not an option. The zinc yellow-chromate plated steel construction provides exceptional corrosion protection in industrial environments exposed to moisture, chemicals, and outdoor elements. With 150,000 psi tensile strength and Rockwell C33 hardness, these 3/8"-16 UNC coarse thread fasteners maintain integrity under extreme vibration and dynamic loading conditions common in heavy machinery, construction equipment, and automotive assemblies. The partially threaded design allows for precise clamping force distribution, while the external hex drive ensures secure installation with standard tools. These industrial screws solve critical challenges in applications requiring both maximum strength and long-term corrosion resistance.
Specification Summary & Compliance
This 1-3/4" hex head screw features 3/8"-16 UNC coarse threads with Class 2A thread fit for precise dimensional accuracy. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for industrial use worldwide.
