S-99612A112 5/16"-24 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments.
• Reliable left-hand thread engagement for specialized applications requiring reverse-direction fastening to prevent loosening under counter-clockwise motion.
• Superior strength and durability from Grade 5 classification, ensuring consistent performance under high-stress conditions.
• Precise UNF fine thread fit with Class 2B tolerance, providing smooth assembly and reduced risk of cross-threading.
• Space-saving thin profile design (3/16" height), ideal for applications with limited clearance without compromising clamping force.
• Easy installation and removal using standard 1/2" external hex drive tools, improving maintenance efficiency.
• Full regulatory compliance with RoHS 3 and REACH standards, meeting global environmental and safety requirements for industrial use.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel thin hex nut with 5/16"-24 UNF left-hand fine thread addresses critical engineering challenges in machinery requiring reverse-thread security. The zinc plating provides essential corrosion protection for outdoor equipment, automotive assemblies, and manufacturing systems exposed to moisture or chemicals. Its left-hand thread direction is specifically engineered for rotating components where standard right-hand threads would naturally loosen, such as fan blades, mixer shafts, and certain power transmission systems. The thin hex profile allows installation in confined spaces while maintaining the high tensile strength of Grade 5 steel, making it ideal for compact machinery designs, electrical enclosures, and precision equipment where both reliability and space optimization are paramount.

Specification Summary & Compliance

This left-hand thread hex nut features precision 5/16"-24 UNF fine threads with Class 2B thread fit for consistent engagement and reliable performance. Manufactured to inch system standards with external hex drive (1/2" width) and thin profile (3/16" height). The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to international environmental and safety standards for industrial fasteners.