S-99612A136 1/2"-20 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced durability in reverse-thread applications with left-hand threading that prevents loosening under counter-clockwise motion
• Reliable high-strength performance from Grade 5 steel construction, suitable for demanding industrial environments
• Superior corrosion resistance through zinc-plated coating that extends service life in harsh conditions
• Space-saving thin profile design allowing installation in confined areas where standard nuts won't fit
• Precise fine thread engagement with UNF 1/2"-20 threading and Class 2B fit for vibration-resistant connections
• Easy installation and removal with standard external hex drive compatible with common wrench tools
• Compliance with international standards including RoHS 3 and REACH for global industrial applications

Professional Applications & Engineering Value

This left-hand thread hex nut provides critical engineering solutions for applications where reverse rotation is prevalent, such as rotating shaft assemblies, mixing equipment, and certain machinery components where standard right-hand threads would naturally loosen. The Grade 5 zinc-plated steel construction delivers exceptional tensile strength while the corrosion-resistant plating ensures long-term performance in industrial environments. The thin hex profile offers significant space advantages in compact assemblies without compromising strength. With UNF fine threading and Class 2B thread fit, this fastener maintains precise tolerances for vibration-prone applications, reducing maintenance requirements and preventing unexpected downtime in critical operations.

Specification Summary & Compliance

This hex nut features 1/2"-20 UNF left-hand fine threads with Class 2B thread fit per UNF standards, ensuring precise engagement and reliable performance. The thin profile measures 3/4" across flats and 5/16" in height. Manufactured from Grade 5 steel with zinc plating for corrosion protection. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting international environmental and safety standards for industrial fastener applications.