Abstract: A cross-piece for heddle frames of weaving looms includes an aluminum outer portion (1) with a box-like structure and a thin, solid, steel inner portion (2) to which a heddle support rail (8) is fixed. The outer portion (1) comprises a cavity (5) for housing a connecting end of the inner portion (2) which is separate and distinct therefrom and the two portions (1, 2) are fixed together in position by two profiled strips (3, 4) of plastic material which are respectively resilient and rigid and are arranged on either side of the connecting end of the inner portion (2). The rigid profiled strip (4) is suitable for snap-engagement with a boss (7) provided inside the cavity (5) of the outer portion (1), allowing a stable and rigid connection between the portions (1, 2).