This work contributes to a proposal for improvement in the assembly area for the most representative regulator for Industries Humcar S.A.S. which is R203, it was made based on the current area. The company is dedicated to the manufacture and distribution of accessories for gas which is located in the city of Bogotá and distributes nationally and internationally. In the first part, the identification of the problem is shown, which consists in the company having to produce parts at a low cost in order to win tenders, therefore, if it does not, it can lose the market. Then an analysis of the distribution factors in the plant in the assembly area, a study of time, material path, and 5S study was performed. When studying the situation it is proposed to make a U-cell in such a way that unnecessary records of the material within the assembly area are reduced, also proposing an adequate 5s, strategies to reduce the bottlenecks and specifically a JIT in order to have a continuous, synchronized and balanced flow.