S-95030A210 1/2"-20 Locknuts

Key Features & Benefits at a Glance

• Secure cotter pin locking mechanism prevents loosening under high vibration, ensuring reliable long-term fastening in demanding environments.
• Durable zinc-plated steel construction provides excellent corrosion resistance, extending the nut's service life in industrial settings.
• Precision Class 2B thread fit offers smooth assembly and a secure connection, minimizing the risk of cross-threading and damage.
• Standard external hex drive profile allows for easy installation and removal with common wrenches, streamlining maintenance and assembly processes.
• Fine UNF thread spacing (1/2"-20) delivers a higher number of threads per inch for improved load distribution and a stronger, more vibration-resistant joint.
• Compliance with REACH and RoHS 3 standards guarantees the product is free from hazardous substances, making it safe for use in regulated industries.
• Pre-drilled slot for a 1/8" cotter pin ensures quick and positive locking, providing a visual and mechanical confirmation of secure installation.

Professional Applications & Engineering Value

This heavy-duty castle locknut is engineered to solve critical fastening challenges in high-vibration and high-stress applications. The zinc-plated steel material provides a robust barrier against rust and corrosion, which is essential for outdoor machinery, automotive assemblies, and agricultural equipment. The cotter pin locking type is a simple yet highly effective method to prevent back-off, making it a trusted solution for axle nuts, king pins, and other pivotal connections where safety is paramount. The fine UNF thread and Class 2B thread fit ensure precise engagement, reducing the likelihood of thread stripping and providing a reliable, repeatable fastening solution for industrial maintenance and manufacturing.

Specification Summary & Compliance

This locknut conforms to UNF (Unified National Fine) thread standards with a size of 1/2"-20 and a Class 2B thread fit for consistent dimensional accuracy. The external hex drive has a width of 3/4" and a height of 7/16". It is designed to accommodate a 1/8" cotter pin with a minimum slot depth of 0.148" and width of 0.15". The product is fully REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) compliant, adhering to strict environmental and safety regulations for industrial components.