Abstract: A viscous vibration damper for a rotary shaft comprising an annular casing of stamped sheet metal and an endplate. The endplate comprises an inner annular hub portion for mounting the damper on the rotary shaft and an outer annular cover portion for closing the open end of the casing. The casing has an inner peripheral wall will a free end having an abutment zone for axial alignment of the casing on the endplate and a cylindrical surface cooperable with a cylindrical shoulder between the hub portion and the cover portion of the endplate for radial alignment of the casing. An inner annular weld is provided adjacent the resulting annular joint at the free end of the inner peripheral wall. An annular joint is also provided at the free end of the outer peripheral wall for axial alignment at the outer periphery of the cover portion and optionally for radial alignment. An annular weld seals the outer joint.