S-91855A540 5/16"-18 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term outdoor use.
• Excellent holding power and vibration resistance provided by the coarse UNC thread profile, ensuring secure connections in high-stress applications.
• Precise and reliable thread engagement with Class 2B thread fit, minimizing the risk of cross-threading and assembly errors.
• Quick and easy installation enabled by the external hex drive, allowing for standard wrench use and reducing assembly time.
• Durable, closed-end design of the standard cap nut profile protects threads from damage, debris, and moisture ingress.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global industrial markets.
• Consistent inch-measurement sizing (5/16"-18) for seamless compatibility with existing UNC-threaded components and tooling.

Professional Applications & Engineering Value

This 5/16"-18 UNC cap nut is engineered to address common industrial fastening challenges, such as corrosion in humid or chemical-exposed settings. The 18-8 Stainless Steel material offers inherent resistance to rust and oxidation, extending service life in machinery, marine equipment, and structural assemblies. The coarse thread design enhances grip and load distribution, reducing the likelihood of loosening under dynamic loads or vibrations. With its external hex drive, installation is straightforward using standard tools, improving efficiency in assembly lines and maintenance operations. Ideal for industrial applications like automotive frames, conveyor systems, and outdoor enclosures, this nut ensures reliable performance where durability and corrosion resistance are critical.

Specification Summary & Compliance

This cap nut adheres to UNC coarse thread standards with a Class 2B thread fit for consistent dimensional accuracy and compatibility. Manufactured to precise inch measurements (thread size: 5/16"-18), it ensures reliable performance in industrial fastening systems. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated environments without hazardous substances.