An Oldham coupling is a type of flexible coupling used to connect two shafts while accommodating misalignment, particularly parallel misalignment. It consists of three components: two hubs with slots and a central floating disc (also called a slider) with tongue-like projections that fit into the slots of the hubs. As the shafts rotate, the disc slides within the slots, compensating for misalignment while maintaining smooth torque transmission. Oldham couplings are commonly used in light to moderate-duty applications, such as printers, conveyors, and pumps, valued for their compact design, ease of assembly, and ability to handle misalignment without backlash.