You can determine the number of threads by using a screw pitch gauge.
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Pitch Gauge has been praised for being a very straight forward and simple app.
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The screw pitch gauge has a number of metal templates that are notched to match the thread configuration of bolts.
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Thread pitch gauges are used as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole.
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"' Pitch Gauge "'( noun : pich-geyj ) is a freemium-based mobile application created by Prolific Methods, Inc . that can be used on smartphones and tablet computers.