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how to measure a screw for replacement the screw is the rotating element in a screw conveyor moving bulk materials from point a to point b determining critical dimensions of the screw is required for proper replacement the most effective way to determine the overall length of a screw is to slide a measuring tape inside the pipe and record the resulting measurement the screw diameter is measured between the top of the flight and the flat surface flight thickness is measured at the tip of the flight with the least wear pitch is determined by measuring from the inside of one flight to the inside of the next flight outside diameter and wall thickness of the pipe are measured at the end of the screw using calipers measure inside diameter of internal collar and coupling bolt holes to determine connecting shaft size and drilling materials of construction flight hand and how the flights are welded to the pipe are important features for all replacement screws other factors like bare pipe paddle
