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#ThreadedThursdays at BTM... 5/8-18 x 5-3/4" Full Thread Stud C1541 Steel .0003 Zinc Plated How can we help you with your custom manufacturing needs? BTM can manufacture virtually any length from 10-24 through 4" diameters. Multiple thread classes are available. These can be made in various grades in both ferrous and non-ferrous materials.