P PT. Bakrie Pipe Industries is a steel pipe manufacturing company with a production capacity of up to 303,000 tons per year. At PT. Bakrie Pipe Industries, there are five Production Floor Plants, namely Plant WTM 8, WTM 16, MM 1, VAT 4, and KT 24. In this final project research, only the KT 24 plant was observed. In the KT 24 plant, there are 22 types of production machines. The problems faced are the difficulty in managing maintenance schedules and the existence of uncontrolled component inventory and aspects of data collection and provision which result in delays in maintenance activities which will ultimately hinder the production process. Therefore, optimal machine maintenance planning is needed to minimize total downtime and increase machine reliability, then an optimal spare parts inventory system is also needed. Therefore, it is hoped that by implementing the Reliability Centered Maintenance II (RCM II) and Reliability Centered Spares (RCS) methods, the problems faced by the company can be resolved. This study begins with selecting critical machines and critical component units based on the number of machines in the production floor. To get the critical machine, the calculation is based on the Pareto diagram so that four critical machines are obtained, namely the High Frequency Welder Machine, Electrical Cut Off, Cooling System, and Jointing Machine. Then the calculation is continued by selecting critical components based on the Pareto diagram and eight critical components are obtained from the four critical machines. Then, activity planning is carried out using the Reliability Centered Maintenance II (RCM II) approach which begins with the creation of Failure Mode and Effect Critically Analysis (FMECA). For the creation of FMECA, it is known that the Contact Shoe component has the highest RPN value of 574. After that, the RCM II Information Worksheet and RCM II Decision Worksheet are made, the proposed tasks obtained are Scheduled On - Condition Task for the Asw ER Gear wire and Carriage Motor components and Scheduled Restoration Discard for the Water Contact Cooling Coil, Limit Switch, Contactor components and also Scheduled Discard Task for the Contact Shoe, Measuring Wheel, Fuse components. • Calculation of maintenance intervals begins by calculating the time interval between damage and repair intervals. Then the distribution selection is carried out based on the largest index of fit using the Least Square Curve Fitting (LSCF) method, then the distribution results are tested using special tests and continued with parameter determination using the Maximum Likelihood Estimator (MLE) method. The calculation of the index of fit and MLE is done by manual calculation and using Minitab 13 software. After that, the periodic replacement interval and periodic replacement interval are calculated using the safety factor. Continued with the RCS policy which begins with the creation of the RCS Worksheet and RCS Decision Worksheet. For the RCS policy, the results obtained are that the components of Contact Shoe, Water Contact Cooling Coil, Contactor, Asw ER Gear wire should be stocked in the warehouse. From the calculation of lot sizing using the Period Order Quantity, Economic Order Quantity and lot for lot methods, it is found that the use of the Period Order Quantity method is better by producing cheaper cost calculations for each material procurement for each component.