S-91257A680 7/16"-14 x 2 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance through zinc yellow-chromate plating that protects against rust and environmental degradation
- Optimized thread engagement with partial threading design that provides better clamping force distribution
- Precise installation control thanks to the external hex drive and hex head design allowing for high torque application
- Consistent thread quality with Class 2A thread fit ensuring proper mating with nuts and threaded components
- Enhanced durability from Rockwell C33 hardness that maintains structural integrity under repeated stress
- Industry-standard compatibility with UNC coarse threads that resist loosening in vibrating environments
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where failure is not an option. The steel construction with zinc yellow-chromate plating provides a robust barrier against corrosion in demanding environments, from manufacturing facilities to outdoor construction sites. The 7/16"-14 UNC coarse thread configuration offers superior resistance to vibration-induced loosening, while the partial threading design ensures optimal stress distribution across fastened joints. With external hex drive compatibility, these screws accommodate high-torque installation tools commonly used in industrial maintenance, machinery assembly, and structural applications where access may be limited but reliability is paramount.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements for hazardous substance restrictions.
