When transmitting a heavy load between a shaft and a pulley, which component should be used?

The use of a gib head taper key in transmitting heavy loads between a shaft and a pulley is essential for several reasons. Taper keys are specifically designed to secure components like pulleys to shafts effectively. They provide a strong and stable connection that can transmit heavy loads without slipping or disengagement.

The design of a gib head taper key allows it to be driven into a tapered slot, creating a snug fit that not only holds the pulley securely in place but also aligns it accurately on the shaft. This precise alignment is crucial for the effective transfer of torque and to prevent wear on the key and the components being connected.

In contrast, other options such as a set screw typically offer less mechanical stability and are more suited for lighter loads, while couplings are generally used to connect shafts rather than for fitting pulleys specifically. Splines, though useful for transferring rotational motion, do not provide the high load-bearing capabilities or easy disassembly that taper keys do in this context.