The Electro Hardware 21mm Aluminum Round Circuit Board Spacer for M3 Screws, model MS1041M04F16D, is engineered to provide precise spacing and support in electronic assemblies. This spacer features a 21mm overall length, with an inside diameter ranging from 3.2mm to 3.6mm, and an outside diameter of 6mm, making it compatible with M3 screws. Constructed from T-3 grade aluminum, it offers a high strength-to-weight ratio, ensuring durability while minimizing added weight. The uncoated finish maintains the spacer's lightweight properties and is suitable for various applications where corrosion resistance is not a primary concern. Designed to meet QQ-A-225A Comp 2 standards, this spacer ensures reliable performance in electronic and mechanical systems. Its round body shape and precise dimensions make it ideal for maintaining consistent spacing between circuit boards and other components, thereby enhancing the overall stability and functionality of electronic devices. By incorporating this spacer into your assemblies, you can achieve optimal component alignment and secure mounting, which are essential for the reliable operation of electronic systems.