There are many kinds of machine screws, which are usually designed according to unified international standards (such as DIN, GB, ANIS, etc.) to ensure compatibility with matching nuts or threaded holes and good interchangeability. Common types include hexagonal, round head, countersunk head screws, etc. Machine screws are widely used in various types of mechanical equipment, industrial production, construction engineering, automobile manufacturing, electronic equipment, home appliance assembly and other fields.