S-95140A159 5/8"-18 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional strength and durability from Grade 5 steel construction, ensuring reliable performance in high-stress and heavy-duty applications.
• Secure left-hand thread engagement prevents loosening under counter-clockwise rotational forces, ideal for specific machinery and safety-critical assemblies.
• Precise Class 2B thread fit offers consistent, vibration-resistant connections with mating components, reducing the risk of assembly issues.
• Standard external hex drive design allows for easy installation and removal with common wrenches, improving maintenance efficiency.
• Fine UNF thread profile (5/8"-18) provides a greater number of threads per inch for a stronger, more secure hold compared to coarse threads.
• Full compliance with RoHS 3 and REACH regulations ensures environmental safety and unrestricted use in regulated industrial markets.
• Robust dimensions (15/16" width, 35/64" height) deliver a substantial bearing surface for enhanced load distribution and joint integrity.

Professional Applications & Engineering Value

This Grade 5 steel hex nut is engineered to address critical challenges in industrial and mechanical systems where reverse rotation or specific torque requirements are present. Its left-hand UNF fine threads are crucial for applications on rotating shafts, mixers, or equipment where standard right-hand threads would naturally loosen. The Class 2B thread fit guarantees dimensional accuracy and a free-spinning assembly, minimizing cross-threading and galling during installation. Manufactured from medium-carbon steel, it provides an optimal balance of strength and ductility, resisting shear and tensile stresses in demanding environments such as automotive, agricultural machinery, and heavy equipment. The standard hex profile ensures compatibility with ubiquitous tools, streamlining workflows for maintenance crews and assembly lines.

Specification Summary & Compliance

This left-hand hex nut conforms to the Unified National Fine (UNF) thread standard with a size of 5/8"-18 and a Class 2B thread fit for consistent, precision-manufactured tolerances. The fastener meets the mechanical property requirements for Grade 5 strength classification. It is manufactured to be fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances and safe for industrial use.