Detailed description of main geometric parameters of self-tapping and self-drilling threads

1). Major diameter/tooth outer diameter (d1), which is the imaginary cylinder diameter where the product thread crest overlaps. The major diameter of the thread basically represents the nominal diameter of the thread size.

(2), minor diameter/bottom diameter (d2): the diameter of the imaginary cylinder where the thread bottom overlaps.

(3). Tooth pitch (p): It is the axial distance between two adjacent teeth corresponding to two points on the median meridian. In the imperial system, the number of teeth per inch (25.4mm) is used to indicate the pitch.

The following table lists the common specifications of the pitch (metric system) and the number of teeth (imperial system)

1. Self-tapping metric system:

Specifications ST1.5ST

1.9ST

2.2ST

2.6ST

2.9ST (Guide: Introduction to the disassembly method of head screw)

3.3ST

3.5ST

3.9ST

4.2ST

4.8ST

5.5ST

6.3ST

8.0ST

9.5

Tooth pitch 0.50.60.80.91.11.31.31.31.41.61.81.82.12.1

2. Inch self-tapping teeth:

Specifications 4#5#6#7#8#10#12#14#

Number of teeth

AB teeth 2420201918161414

A tooth 2420181615121110

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