In the case of a subassembly for a vehicle seat, in particular a fitting for a motor vehicle seat, having a first component (11) and having a second component (12, 21) which can move relative to the first component (11) and by means of regions (15, 17, 19) which are assigned to the first component (11) is mounted, guided and/or supported with respect to the first component (11) or interacts therewith in another manner, the first component (11) is at least partially hardened.