S-91286A219 3/8"-16 x 3 1/4" 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 and Rockwell C33 hardness, ideal for high-stress applications
- Superior corrosion resistance due to zinc-flake coating, extending service life in harsh industrial environments
- Reliable coarse threading (UNC) with Class 2A fit for secure fastening and reduced cross-threading risks
- Optimized partial threading design providing enhanced grip strength where full threading isn't required
- Heavy-duty Grade 8 certification ensuring consistent performance under extreme mechanical stress
- External hex drive compatibility for standard tooling and efficient installation in confined spaces
- Comprehensive regulatory compliance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure isn't an option. The zinc-flake coated steel construction provides superior protection against corrosion in manufacturing plants, construction sites, and machinery assembly. The 3/8"-16 UNC coarse thread configuration ensures rapid installation and vibration resistance, while the partial threading design concentrates clamping force precisely where needed. With 150,000 psi tensile strength and Rockwell C33 hardness, these external hex drive fasteners withstand extreme mechanical stress in structural connections, equipment mounting, and high-vibration environments where reliability is paramount.
Specification Summary & Compliance
This 3/4" length hex head screw features precise Class 2A thread fit with 3/8"-16 UNC coarse thread and right-hand thread direction. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict material compliance standards.
