S-90242A522 5/16"-18 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide 316 Stainless Steel construction, ideal for harsh industrial environments.
• Reliable and secure fastening provided by the Class 2B thread fit, ensuring consistent engagement and reduced risk of loosening.
• Easy installation and removal thanks to the standard external hex drive, compatible with common wrenches.
• Durable, long-lasting performance from the coarse (UNC) thread, which is less prone to cross-threading and damage.
• Confident global sourcing with compliance to RoHS 3 and REACH regulations, meeting stringent environmental and safety standards.
• Versatile application fit due to standard inch system sizing (5/16"-18 thread, 1/2" width), ensuring broad compatibility.
• Optimized for high-stress applications with a robust standard hex nut profile, providing excellent torque transmission.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex nut is engineered to solve critical challenges in demanding sectors like marine, chemical processing, and outdoor infrastructure. The core of its value lies in the Black-Oxide 316 Stainless Steel material, which offers a significant advantage over standard stainless steels by providing enhanced protection against pitting and crevice corrosion caused by chlorides and acidic environments. The coarse thread design is particularly beneficial in applications where vibration is a concern, as it maintains a stronger hold and is easier to assemble in field conditions. Combined with the precise Class 2B thread fit, this nut delivers a perfect balance of ease of assembly and a secure, reliable clamp load, preventing joint failure and minimizing maintenance downtime in industrial fastening systems.

Specification Summary & Compliance

This hex nut conforms to the Unified National Coarse (UNC) thread standard with a Class 2B thread fit for consistent dimensional accuracy. Key specifications include a 5/16"-18 thread size, a width across flats of 1/2", and a height of 17/64". The product is manufactured to be fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets the latest environmental and substance restriction directives for safe use in various industrial markets.