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Tap End Stud Bolts have a short thread on one end, called the tap end which is threaded to a Class NC5 or Class UNC-3A fit. This end is for screwing into a tapped hole. The other nut end is threaded with a Class UNC-2A fit. Length of the stud is measured overall. The tap end has a chamfered point, but the nut end may have either a chamfered or round point, at the manufacturer's option.