![]() Metric thread : It is an Indian standard thread with an included angle of 60° Left-hand thread : A thread when viewed axially, winds in a anti-clockwise direction. Normally all the threads are right hand threads except for some specific needs.ġ4. Internal thread : A thread on the internal surface of the cylinder.ġ3.Right –hand thread : A thread when viewed axially, winds in a clockwise direction. ![]() ![]() External thread : A thread on the external surface of the cylinder.ġ2. Angle of thread : Angle between the flanks of the thread.ġ1. Flank : surface joining the crest and root.ġ0. Root : Bottom part in between the two threads.Ĩ.Depth of thread : Perpendicular distance between the crest and root.ĩ. Minor diameter : Smallest diameter of an external or internal screw thread.ģ.Pitch diameter : The diameter of an imaginary cylinder passing through the thread at such points as to make the width of the thread and the width of the spaces between the thread are equal.Ĥ.Pitch : The distance from one point on one thread to the corresponding point on the next thread.ĥ.Lead : The distance advanced by a screw thread axially in one rotation of the nut.Ħ. 1.Major diameter :Largest diameter of an external or internal screw thread.Ģ.
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