Taper lock bushes are the most convenient & cost effective method of fixing a component (usually a pulley, sprocket or couplings) to a shaft. The bush is pre-machined with the required bore & keyway size and are supplied with locking set/grub screws. available in both metric & imperial shaft sizes which offer a range of bore sizes within the bush series. The bush is identified by a four digit number representing the bush series i.e. 4040 followed by the shaft size e.g.. 4040x60