The distance moved by the tip of the screw for a rotation of one division on the head scale is called the pitch of the Screw Gauge.
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The distance moved by the tip of the screw for a rotation of one division on the head scale is called the least count of the Screw Gauge. On the other hand, pitch is the distance between two successive screw threads. It is also equal to the distance travelled by the tip of the screw for one complete rotation of the head.