Even the best equipment can fail at times. Overuse, missed service dates, occasional misuse, and other problems can bring equipment to a halt. Maintaining an adequate supply of replacement parts provides a number of benefits. Reducing downtime is perhaps the most important of these benefits. Equipment failure always leads to downtime, even if that downtime is short-lived and restricted to only one piece of equipment. Unplanned downtime is common. In fact, downtime affects about 82 percent of businesses and is the largest source of lost production time for most manufacturers, and this lost production time can lead to profit loss.