Creative Re-Threading

[@makersmachining5408]

Adding a little more information about this project: Socket Head Cap Screws are made of an alloy steel, in this case. These are the toughest grade of screw - Grade 8 or DIN 12.9 for metric. They are made of an alloy steel and hardened to around 38 Rockwell (Rc). They have a tensile strength of 170,000 PSI. * Metallurgy is the prevalent study of these materials, strengths and hardness, and very important in manufacturing, especially now with traceability of all goods that we use. Screws of all styles are made of many materials, depending on their final use. * The threads were cut longer by using a "Chasing Die" or "Thread Repairing Die". When using one of these dies, the cut only goes from one side, which has a lead angle, so the threads can gradually cut in to the material (the opposite side doesn't have that lead angle). These dies would be made from hardened carbon steel or high speed steel, because they have to be significantly harder than the bolt material (more metallurgy). They are commonly available ---- Buy "Made in USA" !

[@matthewroepke4644]

Subbed, thanks for the lesson!