252139 is an MCX crimp jack connector designed for use with RG-174/U, RG-188A/U, and RG-316/U coaxial cables. The connector features a brass body with gold plating, a Teflon insulator, a beryllium copper contact pin with gold finish, and a copper ferrule with gold plating. The crimped ferrule requires a hex crimp size of 0.128 inches, and the contact pin is designed for solder termination. With an overall length of approximately 15.46 mm (0.609 in), this connector is suitable for RF applications requiring reliable signal transmission in compact form factors.