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Both surface-mount technology (SMT) and through-hole technology (THT) components may be assembled manually. In low-volume work an assembly line of several If keyed joints shall be made with the help of taper sunk keys, grooves must be prepared in the parts to be joined, in order to receive the key. These parts areonto shafts in order to transmit rotary motion without slip. Key is placed so that part of it lies in a groove cut on the shaft, called " key seat ",