S-91247A517 7/8"-14 x 7 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength and Grade 5 classification for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Precise thread engagement with UNF fine threading and Class 2A fit ensuring secure fastening and vibration resistance
• Optimized torque transmission via external hex drive and 1 5/16" head width for easy installation with standard tools
• Enhanced material durability with Rockwell C25 hardness providing excellent wear resistance and structural integrity
• Versatile partial threading design allowing for both clamping and alignment functions in assembly operations
• Regulatory compliance assurance meeting ASME B18.2.1 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This 7/8"-14 UNF hex head screw delivers critical engineering solutions for heavy-duty industrial applications where high tensile strength and corrosion resistance are paramount. The zinc plated steel construction provides essential protection against environmental degradation, while the fine UNF threading and Class 2A thread fit ensure precise engagement in high-vibration environments. The external hex drive design facilitates efficient installation in confined spaces, and the partially threaded configuration allows for both secure fastening and component alignment. Ideal for structural assemblies, machinery manufacturing, and equipment maintenance, this Grade 5 fastener combines 120,000 psi tensile strength with Rockwell C25 hardness to withstand extreme mechanical stresses while maintaining dimensional stability.

Specification Summary & Compliance

This heavy-duty hex head screw features precise 7/8"-14 UNF fine threading with Class 2A thread fit tolerance for optimal engagement. Manufacturing complies with ASME B18.2.1 specifications and SAE J429 Grade 5 standards, ensuring consistent quality and performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring verified material safety and environmental responsibility.