In thread rolling, the metallic rod (the blank material) is compressed among two roller dies that contains a thread profile. The dies deform the area of the blank following several passes; this transfers the thread profile on the workpiece. A focused type of micrometer, named a thread mic or pitch https://typesoflogsiding70252.blogrelation.com/35431875/types-of-screw-heads-no-further-a-mystery