The 142-0901-821 is an SMA adapter assembly jack-plug connector designed for high-frequency RF applications up to 18 GHz. It features a 50 ohm impedance characteristic with VSWR of 1.0 and RF high potential withstanding voltage of 1000 VRMS minimum at 4 and 7 MHz, along with RF leakage of -90 dB minimum at 2.5 GHz. The connector body is constructed from brass with gold plating (0.00001 inch minimum over nickel plating), the contact is beryllium copper with gold plating, and the retention spring is TEFLON with beryllium copper, all meeting MIL-A-55539 environmental standards. Mechanical specifications include mating torque of 7-10 inch-pounds, coupling proof torque of 15 inch-pounds minimum, and durability rated for 500 cycles minimum, with operating temperature range from -65°C to +165°C. This connector is ideal for precision RF interconnections in military, aerospace, and telecommunications equipment requiring reliable high-frequency signal transmission.