S-90242A166 4-40 Hex Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• Reliable thread engagement ensured by the Class 2B thread fit, providing consistent clamping force and reducing the risk of loosening.
• Easy installation and removal with a standard external hex drive profile, compatible with common wrenches for efficient assembly.
• Durable coarse (UNC) threading offers excellent wear resistance and is less prone to cross-threading compared to fine threads.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global industrial supply chains.
• Precise dimensional accuracy with a 1/4" width and 3/32" height, ensuring compatibility and interchangeability in inch-based assemblies.
• Right-hand thread direction for standard application use, facilitating straightforward installation in common mechanical systems.

Professional Applications & Engineering Value

This 4-40 UNC coarse thread hex nut is engineered to address critical challenges in industrial settings, such as exposure to corrosive agents and the need for long-term fastener integrity. The Black-Oxide 316 Stainless Steel material provides exceptional resistance to oxidation and chemical degradation, making it suitable for marine, chemical processing, and outdoor equipment applications. The coarse thread design enhances durability by resisting wear and seizure, while the Class 2B thread fit ensures reliable performance under vibration and dynamic loads. Its standard external hex drive allows for quick installation with standard tools, reducing assembly time and maintenance costs in machinery, enclosures, and structural frameworks.

Specification Summary & Compliance

This hex nut features a 4-40 UNC coarse thread with Class 2B thread fit for precise dimensional tolerance, adhering to standard inch measurement systems. It is manufactured from Black-Oxide 316 Stainless Steel with a width of 1/4" and height of 3/32". The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial components.