The maximum thickness of the punch depends on a number of factors, including the type of punch, structure, power system and material strength. Generally speaking, a 25-ton press can punch metal sheets with a thickness of 2-4 mm. However, the specific punching thickness also needs to be determined according to the technical parameters of the punching machine and the nature of the material. It is recommended that before using the punch, read the punch instructions carefully and consult a professional to obtain an accurate punch thickness range.