Abstract
This thesis is a study to calculate the standard time for COUPLER SUB FRAME production by employees in the sample factory from studying, finding the production line and assembling. COUPLER SUB FRAME collects data to analyze problems and corrective guidelines for use in planning production to be more efficient It can also be used to refer to the production of other COUPLER SUB FRAME Models after standardization and improvement of the COUPLER SUB FRAME production line by using the principle of ECRS (Eliminate Combine Rearrange Simplify) and the principle of tool design by bringing a jig (Fixture) to help in the COUPLER SUB FRAME production line is 169.58 min/pc, and the new standard time after improvement is 148.42 min/pc in total production time, reducing production time by 12.48 % or 21.16 min/pc.