S-99612A197 1 1/8"-12 Hex Nuts

Key Features & Benefits at a Glance

• Left-hand thread direction provides secure fastening in applications where standard right-hand threads would loosen due to rotational forces
• Grade 5 strength classification ensures reliable performance under medium to high stress conditions with excellent fatigue resistance
• Zinc-plated steel construction offers superior corrosion protection for extended service life in demanding industrial environments
• Thin hex profile allows installation in space-constrained applications while maintaining full nut strength
• Class 2B thread fit delivers consistent engagement and smooth assembly with mating components
• 1 1/8"-12 UNF fine threading provides increased thread engagement and superior vibration resistance compared to coarse threads
• External hex drive design enables easy installation and removal with standard wrenching tools

Professional Applications & Engineering Value

This left-hand thin hex nut addresses critical engineering challenges in applications where counter-rotational forces are present, such as rotating machinery, conveyor systems, and equipment with left-hand threaded components. The zinc-plated steel construction provides essential corrosion resistance while maintaining the Grade 5 strength required for demanding industrial environments. The thin profile design is particularly valuable in space-constrained assemblies where standard hex nuts would be too bulky, while the 1 1/8"-12 UNF fine threads offer superior resistance to vibration loosening. These left-hand fastening solutions are engineered to prevent unintended disassembly in systems where rotational forces would cause standard right-hand threads to back off, making them ideal for machinery maintenance, automotive applications, and specialized equipment requiring reliable reverse-threaded connections.

Specification Summary & Compliance

This hex nut features precision Class 2B thread fit according to UNF standards, ensuring proper engagement with mating components. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications. With dimensions of 1 11/16" width and 39/64" height in the inch measurement system, this fastener maintains strict dimensional accuracy for reliable performance in critical assemblies requiring left-hand thread direction and fine thread spacing.