System of supply in spare parts has direct influence on system of production capacity. In spare parts supply management striving to balance between costs of acquisition and storage of parts in stock and costs and risk associated with their lack in the case of equipment failure is essential. One of the important supply links of production continuity are spare parts suppliers, who set the conditions of supply concerning not only the price of the item, but also the cost of their just-in-time availability. A.J. Ruiz-Torresa and F. Mahmoodi argue that "supplier decision-making is a critical component of supply chain management given the reliance of many organizations on suppliers to manage their inventories and logistics functions". Inappropriate choice of suppliers generates high costs. It results not only from the conditions of supply, but mainly due to losses caused by equipment downtime. Hence, the primary criterion for selection of spare parts supplier is an availability and delivery time, and at a later stage of decision-making process also financial issues. It is confirmed by conducted studies, which indicated that the decisive factors to place and order are time of equipment or machine downtime in a case of parts damage, availability of parts on the market, delivery time and on the fourth position are costs of item. Moreover, lack of spare parts is a cause of every fifth unplanned machine downtime and usually dominates among large enterprises. This order demonstrates the necessity of individual approach to spare parts supply management for machinery and equipment.