Page 11 - THREADING CATALOG

INTRODUCTION

Profile Starts
Thread profile, also called thread form, which refers to the According to the number of starts, the threads are divided INTRODUCTION
cross-sectional shape of a thread. into single-start and multi-start threads. A single-start
It may be square, triangular, trapezoidal, or other shapes. 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.
Single-Start Double-Start Triple-Start
lead lead lead
pitch pitch pitch

Surface Shape
The shape of the surface on which the thread
is cut: it can be cylindrical or conical.

lead=3xpitch
lead=2xpitch
lead=pitch
Lead=Pitch Lead=2xPitch Lead=3xPitch

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