A quick-lock coaxial connector includes: an inner contact; an outer connector body having a mating section at one end; a dielectric spacer disposed between the inner contact and the outer conductor such that the outer conductor body is coaxial with the inner contact; an unthreaded coupling sleeve that at least partially overlies the outer conductor body; an annular slide block positioned within the outer conductor body; a first biasing member that biases the slide block toward the mating section; a second biasing member that biases the coupling sleeve toward the mating section; and a retaining member captured in the mating section of the outer conductor body and movable radially relative to the mating section, the retaining member configured to interact with the slide block and the coupling sleeve to maintain the coupling sleeve in position relative to the outer conductor body.