Place the shaft of the screw in between the jaws of your caliper, tighten them until they rest firmly against both sides of the shaft, and read the measurement off the caliper's dial. Simply holding the screw against a tape measure or ruler may not give you a measurement that is accurate enough for a proper fit. Machine screws are manufactured with tolerances measured in thousandths of an inch. Measure the diameter of the screw's shaft with your calipers. Fortunately, there is a simple method to determine which machine screw you need for your project. Screws of the same diameter with a different thread pitch are not interchangeable, and may damage the tapped threads in a nut or hole if you try to force it to fit. Not only do you need to know the diameter and length of the screw, you also need to know the thread pitch, or number of threads per inch. Getting the right size machine screw for your project can be a frustrating experience. He now builds wooden boats in the north woods. He worked as a reporter and columnist in South Florida before becoming fascinated with computers.Īfter studying programming at University of South Florida, he spent more than 20 years heading up IT departments at three tier-one automotive suppliers. Finn McCuhil is a freelance writer based in Northern Michigan.
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