The aim of this research is to obtain the minimum spring back value in bending metal plates using a press tool with a squishing process for the case of forming aluminium plates on S-shaped clothes hanger products with a 90o angle. The problem faced in bending metal plates is the occurrence of spring back which has more serious consequences if for example aircraft door products which must have accurate product dimensions so that they can be opened and closed tightly without any air or rainwater leaks. The research method includes simulation with Simufact and Solidwork softwares on a 2.8 mm thick aluminium plate with varying squishing depths, namely 0.1 mm, 0.2 mm, and 0.3 mm after the bending step, measuring the resulting spring back, making a radius optimal punch from the simulation results, testing the bending of the plate with a press tool, measuring the spring back value that occurs, analyzing the spring back results, and drawing conclusions. Results from research with an optimal punch radius on an S-shaped clothes hanger product with a 90o angle with a value of 1.5 mm, an optimal squishing depth of 0.1 mm on 2.8 mm thick aluminium material with a width of 19 mm producing a spring back of 0.058o with compressive force worth 3009.6 kg.