S-91268A240 3/8"-16 x 2 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 for reliable performance in high-stress applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life in demanding environments
- Optimized installation efficiency with coarse UNC thread spacing and external hex drive for quick, secure fastening
- Precise thread engagement through Class 2A fit, reducing cross-threading risks and improving assembly reliability
- Full-threaded design providing consistent clamping force along the entire 2-1/4" length for enhanced joint stability
- Heavy-duty construction meeting Grade 8 standards, ideal for critical industrial and machinery applications
- Environmental compliance assurance with RoHS 3 and REACH standards, supporting sustainable manufacturing practices
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The steel construction combined with 150,000 PSI tensile strength and Rockwell C33 hardness provides reliable fastening solutions for structural components, machinery assemblies, and equipment subjected to extreme vibrations and dynamic loads. The 3/8"-16 UNC coarse thread spacing ensures rapid installation while maintaining superior pull-out resistance, significantly reducing assembly time in production environments. The fully threaded design distributes clamping force evenly across the entire fastener length, preventing joint loosening in high-vibration settings common in manufacturing, construction, and automotive applications.
Specification Summary & Compliance
This Grade 8 hex head screw features precise Class 2A thread fit tolerance with 3/8"-16 UNC coarse thread specifications and 2-1/4" length. Manufactured in compliance with ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the fastener meets current environmental safety requirements for industrial use.
