Page 16 - Threading

INTRODUCTION Starts Single-Start Double-Start Triple-Start
According to the number of starts, the threads are divided into single-start and multi-start threads.
A single-start thread has one continuous thread running along the body of the screw. A multi-start
thread consists of two or more intertwined threads running parallel to one another. The lead distance
of a double-start thread is twice that of the single-start thread and a triple-start thread has triple that of
the single-start thread. For example, if the end of the workpiece part is divided into two or three equal
parts, and the threads start from each of these points, then this indicates double or triple thread starts.

Lead
Lead
Pitch Pitch Pitch Lead

Lead=Pitch Lead=2xPitch Lead=3xPitch

14 ISCAR