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T-shaped double gear is a type of double gear structure with an axial cross-section in the shape of a T and formed as a whole. Two gears are coaxial, with the same core and different diameters (or tooth shapes), commonly used for compact deceleration/reversing/shifting, and are very common in semi-automatic capping machines.

PM = Powder Metallurgy， Powder metallurgy, PM double gear=powder metallurgy double gear/double-layer gear, is a gear that is integrally formed, coaxial with two different tooth numbers/moduli, and is made by pressing and sintering metal powder. It belongs to precision transmission parts.