Luer connector

A luer-type connector comprising a male-component formed with a locking nozzle having a co-axially extending lumen, and a locking collar rotatable over said nozzle, said locking collar having a rear end and being formed with an internal thread for screw coupling with a radially extending annular lug of a mating female-component of the luer-type connector, the nozzle being formed with a ridge, the ridge having a radially extending abutting wall surface facing the rear end of the locking collar, and an outer peripheral surface connected to the abutting wall surface at an edge, an angle between the outer peripheral surface of the ridge and the abutting wall surface of the ridge no greater than 90.degree., the locking collar being formed with a ridge-engaging portion comprising a first wall surface that tapers toward the rear end of the locking collar and that forms an angle of greater than 0.degree. with respect to the outer peripheral surface of the ridge, and a second wall surface radially extending and engageable with the abutting wall surface of the ridge, the first wall surface engaging the edge of the ridge and being frictionally displaceable along the edge of the ridge and the second wall surface preventing further forward axial displacement of the locking collar with respect to the nozzle.