Screw threads - Helix or conical spiral formed on the external surface of a shaft or on the internal
surface of a cylindrical hole.
Form - The shape of some common threads
External threads - located on the outside of the part
Axis - a longitudinal center line of thread
Root - the bottom of the cut on external threads
Crest - the top of external threads
Major diameter - the largest diameter of a screw thread
Minor diameter - the smallest diameter of screw thread
Pitch diameter - an imaginary diameter measured from a point halfway between the major and minor
diameters through the axis to a corresponding point on the opposite side
Pitch - The distance from a point on a screw thread to a corresponding poing on the next thread as
measured perpendicular to the axis.
Depth of thread - the distance between the crest and the root of a thread as measured perpendicular to
the axis
Angle of thread - the included angle between the sides of the thread
, Body - that portion of a screw shaft that is left unthreaded
chamfer - an angular relief at the last thread to help the thread engage more easily with a mating part.
classes of threads - a designation of the amount of tolerance and allowance specified for a thread
fit - identifies a range of thread tightness or looseness
thread series - groups of common major diameter and pitch characteristics determined by the number
of threads per inch
lead - the distance a screw thread advances in one full turn
Single thread - composed of one continuous ridge, the lead of a single thread is equal to the pitch
Multiple threads - made up of two or more continuous ridges following side by side
Tap - Cuts internal threads
Die - Cuts external threads
Through hole - Goes completely through an object.
Blind hole - does not go completely through an object
Bolt - Passes through the parts and uses a nut to tighten or hold the parts together
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