Gear couplings ordinarily come in two variations, flanged sleeve, and continuous sleeve. Flanged gear couplings consist of short sleeves surrounded by a perpendicular flange. One sleeve is placed on each shaft so the two flanges line up face to face. A series of screws or bolts in the flanges hold them together. Continuous sleeve gear couplings feature shaft ends coupled together and abutted against each other, which are then enveloped by a sleeve. Generally, these sleeves are made of metal, but they can also be made of Nylon.
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