In many industries, assembly lines are automated to reduce production cost. Utilizing industrial robots which are superior to humans in repetitive and dangerous operations. This paper presents an automated and flexible FIST assembly line concept which consists of layout of plant, timing and options for each action. ‘L’ shaped connected stations states in which sequence the closure products are being assembled. It is through line balancing that optimal number of stations, cycle time and efficiencies are approved. Besides, financial analysis, to which ROI, TBO and TCO are critically correlated, are elaborated accordingly as well.