Imagine that you are drawing a schematic internal thread symbol and you have just drawn the outline of the tap drill hole's diameter to the required depth. What should you do next?

Question

Quizplus · Accepted Answer

The next step after drawing the outline of the tap drill hole's diameter is to draw the outline of the thread's major diameter to the required depth. This is because the major diameter of the thread is the most significant dimension of an internal thread and determines the size of the bolt or screw that will fit into the thread. Darkening and adding crosshatching (A) comes later to distinguish the thread from the surrounding surface. Drawing the lines for the minor diameter (C) and estimating the pitch spacing and drawing lines to the major diameter (D) are also important steps, but they come after drawing the outline of the major diameter.

Imagine That You Are Drawing a Schematic Internal Thread Symbol