S-91257A779 9/16"-12 x 7" 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating in harsh industrial environments
- Enhanced durability with Rockwell C33 hardness to withstand vibration and mechanical stress
- Precise thread engagement with Class 2A fit for reliable assembly and reduced cross-threading risks
- Optimized partial threading design providing both gripping strength and clearance flexibility
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
- Easy installation and removal with external hex drive and 13/16" head width for standard tool compatibility
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value through its high-strength steel construction and zinc yellow-chromate finish, specifically designed to address industrial fastening challenges. The 9/16"-12 UNC coarse thread configuration ensures rapid installation in heavy machinery, structural steel connections, and equipment assembly where vibration resistance is critical. The partially threaded design provides concentrated clamping force where needed while allowing clearance through unthreaded sections, preventing material distortion. With its 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains integrity under extreme loads, making it ideal for construction, automotive, and manufacturing applications requiring reliable, long-term fastening solutions that withstand environmental stressors.
Specification Summary & Compliance
This 7" hex head screw features precise Class 2A thread fit with 9/16"-12 UNC coarse threading and 1 5/8" minimum thread length. Manufactured from high-strength steel with zinc yellow-chromate plating for corrosion protection, the fastener complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and performance reliability for industrial applications. The inch system measurement provides compatibility with standard North American equipment and tooling requirements.
