As one of the leading Stainless Steel U Bolt manufacturers we produce the bolts in different grades of the material. There are 304, 316 and other types of stainless steel materials used for the production. The 316 Stainless Steel Square U Bolts are formed after the threads are rolled on them. The thread rolling reshapes the bolt with threads. To make sure that the threads are in place and strengthened, the forming operation takes place after threading. If the 304 Stainless Steel U Bolts are formed before threading, the threads might crack while rolling.Also, the newly made threads would not be stronger as the deformed surface is not formed.