S-91286A286 7/16"-14 x 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 tensile strength of 150,000 psi provides reliable performance in high-stress applications, preventing fastener failure
- Superior corrosion resistance from zinc-flake coating extends service life in harsh industrial environments
- Optimized partial threading design ensures secure fastening while reducing material stress concentrations
- Precise Class 2A thread fit guarantees consistent engagement and reliable assembly in demanding applications
- Heavy-duty Grade 8 construction with Rockwell C33 hardness maintains structural integrity under extreme loads
- External hex drive design allows for high-torque installation and easy removal with standard tools
- Industry-standard compliance ensures compatibility and reliability across various industrial applications
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value through their high-strength steel construction and advanced zinc-flake coating. The 7/16"-14 UNC coarse thread configuration provides superior holding power in structural applications, while the partial threading design minimizes stress risers that can lead to fatigue failure. The external hex drive enables efficient installation in confined spaces common in heavy machinery, construction equipment, and industrial assemblies. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures these fasteners maintain clamp load in vibrating environments, making them ideal for critical connections in manufacturing, automotive, and infrastructure projects where reliability is paramount.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse thread specifications ensuring consistent performance. These hex head screws comply with ASME B18.2.1 and SAE J429 Grade 8 standards for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards are maintained throughout the supply chain.
