... marking on the flat surface 2.metal marking machine 3.pin marking machine 4.marking on the mechanical part Marking Surface ... flatness not exceeding 3mmApplicable Scope: Motor part, Mechanical part, Machine tool, Hardware product, Valve, Pump valve, Electro-mechanical ... Manufacturing Number and Date, Company Name, Brand, etc. , on Vehicle Body, Frame, Base Plate, Pillar, Engine, Connection Rod, Cylinder ...