Bolt element producing process involves measuring out wire pin, fitting it between two roll jaws and rolling wire pin to reduced diameter in one sector

摘要

The bold element is produced starting from a measured-out cylindrical wire pin, the front sector of which is reduced in diameter by a rolling process. For a threaded bolt or screw, the reduction and thread-rolling can be done in a single process using a single roll jaw pair (1) with a reducing surface (6) by which the diameter reduction is accomplished.