In this era of globalization, companies compete to exist in their respective fields, in the production process the company is required to produce a quality product according to consumer desires. Factory PT. Sejati Jaya is an individual company engaged in the industry of sewing thread and accessories (straps, plastics, lace, and webbing). Yarn production from 2014 to 2016 was 372,000 kg, 414,000 kg and 506,000 kg, respectively, with an average growth of 2.98%. High consumer demand often can not be fulfilled because of insufficient stock of raw material, to overcome the problem the researcher took the research with title "Planning of Production Raw Material Inventory With Material Requirement Planning (MRP) Method At PT. Sejati Jaya ". In this study the method used is the method of observation with the steps of data analysis techniques forecasting, determining Master Production Schedule, determine Netting, Lotting Process, Offsetting Process, Explosion Process. Based on the results of the analysis, it was obtained using Linear technique, the demand in January was 53,352 Kg, the month of February was 54,201 Kg, the March was 55,051 Kg, the month of April was 55,900 Kg, the month of May was 56,750 Kg, June was 57,599 Kg, Of 58,449 Kg, in August at 59,298 Kg, in September of 60,148 Kg, in October of 60,997 Kg, in November at 61,847 Kg, and in December of 62,696 Kg. . From the calculation of Lot Sizing by using Lot Lot Lot technique, the reservation cost is Rp.35.988.604.
Keywords: Planning of future raw material inventory