These nuts are used in a sawmill. The thread is one thread per inch, three starts, three inch lead, three inch outside diameter. The thread goes through the nut's entire 14.5 inch length. The relatively small diameter and long length, with a fast lead make this a challenging job. We are experts at accomplishing this kind of machining challenge.

Special threading tool

Part is 14.5 inches long

3 inch dia., 1 thread per inch, 3 inch lead, 3 start
thread

Nut with mating screw