Hi, Please help me in finding thread length engagement. Please find attaché image I have a product comprising of 2 parts fastened together. Hydraulic fluid is passing thru it. My inputs- load, size of the fastener used (ex: M8 X 1.5). My constraints are-the boss length should be kept to the minimum (because of assembly constraints. I need to find the minimum thread length engagement of the threads i.e. whether it can sustain the load when only 5 full threads are engaged or more threads need to be engaged. By finding the engagement length I can decide the length of the boss. In the process visited the site http://www.engineersedge.com/thread_strength/thread_minimum_length_engagement_fed-std-h28.htm. In the formula the load parameter is not considered. Please mail me a solution.