A slide assembly for slidably mounts a server unit (100) to a rack (200), said slide assembly includes an inner slide (110), an outer slide (150) and a locking device (130). The inner slide has an inner side (111). A locking device disposed on the inner side of the inner slide at a distal end thereof, the locking device includes a spring (133), a locking member (135), and a base (131), the base has a receiving opening (1315), the locking member being held within the base and resiliently protruding out from the receiving opening by support of the spring. An outer slide slidably attached to the inner side of the inner slide, the outer slide defines an engaging opening (153) at a distal end corresponding to the locking member, the locking member in alignment with the engaging opening to limit a back and forth longitudinal movement of the inner slide.