Step 1: Cutting Round Bar to Length
All thread rod is mass produced and commonly available off the shelf in 3’, 6’, 10′ and 12’ lengths. The first labor operation in the mass-production of all thread rod is cutting the material to its desired length. With smaller diameters (3/4” and below) the material is typically bought in a large coil which is then straightened, drawn down to a pitch diameter, descaled, and cut to length. With larger diameters, the material is typically cut from steel round bar, instead of coil, which requires no straightening.
Step 2: Threading
Once the round bar is cut, the rod is fed directly through cylindrical roll threading dies. This roll threading process takes reduced diameter rod (pitch diameter) and forces it between rotating dies. The displacement of the rod forms a full-sized thread. It is a quick and efficient method for manufacturing which results in significant cost savings over cutting the threads. Rods that are readily available off the shelf are mass produced using this method of threading.
Most mass-producers supply these long lengths of all thread rod to bolt manufacturers and fastener distributors who buy and sell these long lengths of all thread rod to contractors who cut the rods to length in the field. However, most often bolt suppliers will cut the threaded rods to specific lengths required for the project.