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　　The Z18 type expansion coupling sleeve (referred to as the expansion sleeve) is an advanced basic component widely used in the world for mechanical connection under heavy loads. In the connection between the wheel and the shaft, it is produced by tightening the high-strength seat bolts. A kind of pressure and friction to achieve load transmission...

　　The Z19A type expansion coupling sleeve has a long service life and high strength. The expansion sleeve relies on friction transmission, and there is no keyway weakening to the connected parts, and there is no relative movement, and there will be no wear during work...