S-99612A178 7/8"-14 Hex Nuts

Key Features & Benefits at a Glance

• Left-hand threading provides secure fastening in applications where standard right-hand threads would loosen due to counter-rotational forces
• Grade 5 steel construction delivers reliable tensile strength and durability for heavy-duty mechanical assemblies
• Zinc-plated surface treatment offers enhanced corrosion resistance in demanding industrial environments
• Thin profile design enables installation in space-constrained applications without compromising strength
• External hex drive ensures efficient torque transmission and secure installation with standard tools
• Class 2B fine threading provides precise fit and vibration resistance in critical assemblies
• Environmental compliance meets RoHS 3 and REACH standards for safe use across regulated industries

Professional Applications & Engineering Value

This specialized left-hand thread hex nut addresses critical engineering challenges in rotating machinery and mechanical systems where reverse rotation occurs. The 7/8"-14 UNF fine thread configuration combined with Grade 5 zinc-plated steel construction ensures reliable performance in high-stress applications such as industrial machinery, automotive systems, and power transmission equipment. The thin hex nut profile provides space-saving advantages while maintaining full mechanical integrity, making it ideal for compact assemblies requiring left-hand threaded fasteners that resist loosening under counter-clockwise motion. The external hex drive design facilitates efficient installation and removal with standard wrenching tools, streamlining maintenance procedures in industrial settings.

Specification Summary & Compliance

This fastener features precision UNF thread standards with Class 2B thread fit for consistent mating compatibility. Dimensional specifications include 7/8"-14 thread size with fine pitch spacing, 1 5/16" width across flats, and 31/64" height profile. The nut complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across various industrial sectors while meeting Grade 5 strength classification requirements for reliable performance in demanding applications.