S-91247A887 7/8"-9 x 3 3/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Optimized installation efficiency with external hex drive and coarse UNC threading for faster assembly
- Precise thread engagement with Class 2A thread fit ensuring consistent fastening performance
- Enhanced durability from Rockwell C25 hardness, maintaining structural integrity under stress
- Versatile partial threading allowing both secure clamping and adjustable positioning capabilities
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and reliable fastening are paramount. The zinc plated steel construction provides essential corrosion protection in manufacturing facilities, outdoor installations, and high-moisture environments. The coarse UNC threading ensures rapid installation and superior resistance to vibration loosening, while the external hex drive accommodates standard tools for efficient maintenance and assembly operations. With partial threading design, this fastener offers optimal clamp load distribution, making it ideal for applications requiring both secure fastening and adjustability in construction, automotive, and heavy equipment sectors.
Specification Summary & Compliance
This 7/8"-9 UNC hex head screw features precise Class 2A thread fit tolerances and 3 3/4" length with 2" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 standards, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications while meeting strict material safety requirements.
