A press-fit splined connection is provided for joining rotary members (4) and (6) together with member (4) having at least one elongate groove (1) having opposite sidewalls and member (6) having at least one elongate tooth (8) having opposite side walls and operative to register with and be slideably received in groove (10) to provide the splined connection between members (4) and (6). The press-fit is provided by the sidewalls of one of tooth (8) or groove (10) having a sinusoidal configuration to provide convex surfaces (16) that impinge upon the sidewall adjacent thereto either at about the same location or at about one-half period apart with sufficient interference to provide the press-fit between tooth (8) and groove (10). Either of tooth (8) or groove (10) having the sinusoidal configuration preferably includes a straight portion for a predetermined length "L" at either or both of its ends to facilitate assembling members (4) and (6) together.
