The main difference between 618-2E and 625-4E is the number of stations and automatic feeders. 618-2E is equipped with a two-station automatic upper tool changer and two sets of automatic feeders, which is suitable for small and medium batch production and processing fewer types of fasteners; while 625-4E is equipped with a four-station automatic upper tool changer and four sets of automatic feeders, which can process more types of fasteners at the same time and is suitable for large-scale and diversified production needs. Just choose the most suitable model according to your production task requirements.