S-92620A640 3/8"-16 x 4 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 reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
- Maximum hardness and durability with Rockwell C33 rating, ensuring minimal wear and deformation under heavy loads
- Easy installation and removal through external hex drive design, compatible with standard wrench tools
- Secure fastening performance with Class 2A thread fit and UNC coarse threading, preventing loosening in vibrating conditions
- Full thread engagement capability along the entire 4½" length, providing consistent clamping force distribution
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interchangeability
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these Grade 8 hex head screws deliver critical reliability where failure is not an option. The steel construction with Rockwell C33 hardness maintains structural integrity under extreme tension, while the zinc yellow-chromate plating provides superior corrosion protection in outdoor or chemically aggressive settings. The 3/8"-16 UNC coarse threading with Class 2A fit ensures rapid installation and vibration resistance in heavy machinery, construction equipment, and structural assemblies. These fully threaded fasteners distribute clamping force evenly across the entire 4½" length, making them ideal for thick-section materials and high-stress joints requiring maximum engagement.
Specification Summary & Compliance
This Grade 8 hex head screw features precise Class 2A thread fit with 3/8"-16 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The fastener meets industry standards for heavy-duty applications with verified 150,000 PSI tensile strength and Rockwell C33 hardness, providing reliable performance in critical engineering applications.
