There is no strict international standard specifications, there is no relevant parameter regulations, there is no need to correspond to standards of thread rolling die plate mould, free to control the collocation, usually specific requirements are presented by customers, then mould produced based on these data and information by the screw manufacturer, generally non-standard screw manufacturing costs are higher than standard screws. There are many types of non-standard screws, because of the characteristics of non-standard screws, so it is difficult to have standard classification for non-standard screw thread rolling die plate mould. Generally, it is developed independently by enterprises according to market needs, their own brand development and extending the vitality of products.