FILENAMES: Bob_1.jpg Bob_2.jpg Bob_3.jpg DESCRIPTION: These are pictures explaining thread rolling. Posted by Errol Groff . The following description was provided: ================================================================= Pictured in Bob 1 and 2 are Bob the world famous "Shop Rat" posing with a pair of 3/8 - 16 thread rolling dies. The bolt in the photo is a 1" - 8 which I happened to have in my hand at the moment I was setting up the pictures. Bob 3 is a representation of the end view of the rolling die. Thread dies work on the principal of embossing the thread into the blank rather than cutting the thread. This gives the grain of the metal a flow that follows the contour of the thread rather than cutting through the grain of the metal. This gives a str