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These couplings have easier designs that sandwich a rubber buffer (nitrile rubber) between two hubs. The hub is lightweight, being fabricated from aluminum alloy. The simple structure sandwiches a spider (rubber buffer) between hubs, so the coupling is definitely fastened or eliminated by transferring the device within the axial direction. Mounting on a shaft is easy. Simply maintain a straight-edge to the hub periphery to middle it.One source of attraction is that its clear-cut construction skill lower cost. Application Pumps/Fans/Textile machinery