The pitch scale of the screw Gauge is graduated in
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A scale graduated in mm is engraved parallel to the axis of the thimble. This is known as the pitch scale. The head of the screw consists of a rachet that avoids undue tightening of thescrew. On the thimble, there is a circular scale known as the head scalewhich is divided into 50 to 100 equal parts.
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