A back frame (28) for a seat back (18). The back frame (28) has side members (30) and cross members (32). The side members (30) have a dimension (40) which is larger than a corresponding dimension (42) of the crossmembers (32). The dimensions (40) and (42) being taken along the same direction. The crossmember (32) is inserted into a partial opening (34) in the side member (30). Since the dimension (42) is less than the dimension (40), the partial opening (34) does not extend across the entire dimension (42). Instead the opening (34) only partially extends across the dimension (40) to a length substantially equal to dimension (42). The partial opening (34) is arranged against one side of the side member (30), so that the cross member (32) is positioned closer to that side. Sleeve nuts (36) are arranged in the side members (30), and are used to attach a recliner (54) which then attaches to the seat base (16).