S-91247A514 7/8"-14 x 6" 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
• Enhanced corrosion resistance through zinc plating, extending service life in industrial environments
• Secure fastening with precise thread engagement thanks to Class 2A thread fit and UNF fine threading for vibration resistance
• Easy installation and removal with external hex drive and 1 5/16" head width for standard wrench compatibility
• Optimized weight distribution with partial threading design that maintains strength while reducing material usage
• Consistent hardness performance at Rockwell C25 ensuring durability under repeated stress conditions
• Universal inch system compatibility for seamless integration with existing industrial equipment and assemblies

Professional Applications & Engineering Value

This 7/8"-14 UNF hex head screw delivers critical engineering solutions for heavy machinery, structural frameworks, and industrial equipment assembly. The Grade 5 steel construction combined with zinc plating addresses common industrial challenges including corrosion-induced failure and joint loosening under vibration. The partial threading design provides optimal clamp force distribution while the UNF fine threads maintain superior resistance to vibrational loosening in dynamic applications. With external hex drive compatibility, installation efficiency is maximized using standard industrial tools, reducing assembly time and labor costs in manufacturing, construction, and maintenance operations where high-strength fasteners are essential for structural integrity.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit tolerances with 7/8"-14 UNF threading and 6" length in the inch measurement system. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.