S-91268A247 5/16"-18 x 5" 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 capability with 150,000 PSI tensile strength, ideal for high-stress structural connections
- Superior wear and deformation resistance due to Rockwell C33 hardness, extending service life in abrasive environments
- Reliable fastening in vibration-prone applications through UNC coarse threading and Class 2A fit for secure engagement
- Optimized for quick installation and removal with external hex drive and 1/2" head width for standard wrench compatibility
- Partial threading design provides unthreaded shank strength where full clamping force is required
- Guaranteed material and manufacturing consistency meeting ASME B18.2.1 and SAE J429 Grade 8 specifications
- Environmentally responsible sourcing with full compliance to RoHS 3 and REACH regulations
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical performance where fastener failure is not an option. The 5/16"-18 UNC coarse thread configuration ensures rapid assembly in steel frameworks, machinery bases, and structural supports while resisting vibration loosening. With 150,000 PSI tensile strength and Rockwell C33 hardness, this partially threaded fastener maintains integrity under extreme mechanical loads and impact forces. The external hex drive and 5" length make it particularly suitable for construction equipment, automotive assemblies, and industrial machinery where high-strength connections must withstand prolonged operational stress without compromising joint security.
Specification Summary & Compliance
This inch system fastener features precision Class 2A thread fit with 5/16"-18 UNC coarse threading and 7/8" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.
