Abstract: A lockset includes a casing, a bolt, a spindle which can be turned for reciprocating the bolt, and a slide bar for locking the latch bolt and the spindle which are all made of stainless steel. The bolt is slidably received in a housing made of plastic such as nylon or acetal plastic which is mounted in a casing and located by positioning posts projecting from one side wall of the casing. The spindle carries a lever arm engageable with a pin projecting from the bolt to reciprocate it by turning of the spindle and a side plate of the casing has in it an aperture large enough for movement of an end portion of the spindle and the lever arm through it. The slide bar can be slid between a locking position in which it blocks reciprocation of the bolt and turning of the spindle and a released position, and such slide bar can be moved selectively either by a key lock or by a manually manipulated pin.