S-95307A802 4-40 MS21042L-04 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through precision distorted thread locking technology, ensuring reliable performance in high-stress environments.
• Enhanced corrosion protection with cadmium yellow-chromate plating, extending service life in harsh industrial or outdoor conditions.
• Smooth, efficient installation thanks to built-in lubricant, reducing assembly time and preventing galling.
• High thread precision with Class 3B fit, providing secure fastening and minimizing the risk of loosening under load.
• Integrated flange design eliminates the need for separate washers, distributing load evenly and simplifying inventory.
• Robust external hex drive allows for easy tightening with standard tools, improving workflow efficiency.
• Compliance with MS21042L-04 standards ensures consistent quality and reliability for critical applications like aerospace and heavy machinery.

Professional Applications & Engineering Value

This 4-40 UNC flange lock nut is engineered to address common industrial challenges such as vibration-induced loosening and corrosion. The distorted thread locking mechanism creates consistent friction, maintaining clamp force in dynamic environments like aircraft assemblies and heavy-duty machinery. Made from cadmium yellow-chromate plated steel, it offers excellent resistance to rust and wear, reducing maintenance costs. The coarse UNC thread and Class 3B fit ensure precise engagement, while the integrated flange provides stable bearing surface support, preventing damage to connected materials. Ideal for applications demanding reliability, this nut combines advanced locking technology with durable materials to enhance safety and longevity in industrial fastening systems.

Specification Summary & Compliance

This flange lock nut adheres to MS21042L-04 specifications, with a 4-40 UNC coarse thread and Class 3B thread fit for high precision. Dimensions include a flange diameter of 0.206", thickness of 0.03", width of 5/32", and height of 1/8". It features a right-hand thread direction and external hex drive for standard tool compatibility. The cadmium yellow-chromate plating meets typical industrial standards for corrosion resistance, and the product is designed to comply with relevant regulations such as RoHS and REACH, ensuring environmental and safety compliance in industrial and aerospace applications.