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Thread measuring instruments from Grainger can size and verify the widths of threaded rods, bolts and washers with easy and accurate readings. With a threaded measuring gage, for example, calibrated holes and molded thread profiles help accurately identify the wire gauges, thread styles and lengths of threaded fasteners including your hex nut, thumb screw or machine screw. Thread-measuring wire sets also are available. They measure U.S. threads ranging from 3 to 48 threads per inch and metric threads from 0.05 to 6 millimeters. Rely on Grainger measuring tools to get accurate readings on supplies.