The 242129 is an SMA female to MCX female adapter designed for RF and microwave applications requiring impedance matching between SMA and MCX connectors. The adapter features a brass body with gold plating for corrosion resistance and reliable electrical contact, combined with a Teflon insulator and beryllium copper contact pin to ensure low insertion loss and consistent performance. Key dimensional specifications include a 1/4-36UNS-2A thread interface with body dimensions of 7.80 mm diameter and 21.20 mm length. This adapter is commonly used in RF test equipment, wireless communication systems, and laboratory instrumentation where seamless connector compatibility and signal integrity are essential.