S-99612A175 7/8"-9 Hex Nuts

Key Features & Benefits at a Glance

• Left-hand thread design provides secure fastening in applications where standard right-hand threads would loosen due to rotational forces
• Grade 5 strength classification ensures reliable performance in medium-duty industrial applications with excellent torque resistance
• Zinc-plated steel construction offers superior corrosion protection for extended service life in demanding environments
• Thin profile design saves space and weight while maintaining full thread engagement capability
• Coarse UNC thread spacing enables quick installation and removal while resisting vibration-induced loosening
• Class 2B thread fit provides optimal balance between easy assembly and secure fastening retention
• External hex drive style allows for standard wrench access and high torque application capability

Professional Applications & Engineering Value

This left-hand thread hex nut addresses critical engineering challenges in applications where counter-rotational forces are present. The Grade 5 zinc-plated steel construction provides the necessary strength and corrosion resistance for industrial machinery, automotive systems, and rotating equipment where reverse-thread fastening is essential for safety. The thin profile design is particularly valuable in space-constrained assemblies while the coarse UNC thread pattern ensures reliable performance in high-vibration environments. This specialized 7/8"-9 UNC fastener prevents accidental loosening in applications such as rotating shafts, mixer blades, and machinery where standard right-hand threads would naturally unscrew during operation, providing engineered security for demanding industrial applications.

Specification Summary & Compliance

This hex nut features precise Class 2B thread fit per UNC standards with dimensions of 1 5/16" width and 31/64" height. Manufactured to Grade 5 strength requirements with zinc-plated steel construction, the fastener ensures dimensional accuracy and reliable performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety standards for industrial components.