Thread Terminology (PDF)

Major Diameter - It is the largest diameter of the thread which would touch the crests.

Minor Diameter - It is the smallest diameter of the thread which would touch the roots.

Pitch Diameter - It is a middle diameter between the major and minor diameter of screw threads.

Root - Root of the deepest part of the grove that corresponds with the minor diameter.

Flank Angle -This is the angle made by the intersection of the two thread flanks.

Pitch - Pitch of a thread is the distance between 2 crests.

Angle - The thread angle of a screw is the angle between the threads.

Crest - Crest of the thread is the top part of the grove that corresponds with the majr diameter.

Flank - The flank is the angle at which the helix is raised to form a crest.


Updated: 3/22/2018

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