Sanohatsu Co., Ltd.
|Sanohatsu Co., Ltd. Patent applications|
|Patent application number||Title||Published|
|20120070247||Method for manufacturing fastening screw and fastening screw - An object of the present invention is to reduce the fastening time and to obtain a predetermined fastening force and to suppress the loosening of a screw. The solution of the present invention is to provide a method for manufacturing a fastening screw, which comprises: a preliminary upsetting step B for forging a front end of a blank wire||03-22-2012|