Self drilling - main geometrical parameters of self drilling thread |
(two) path / tooth bottom diameter (D2): the diameter of the imaginary cylinder that coincides with the bottom of the thread
(three) pitch (P): the axial distance between adjacent teeth corresponding to the two points on the middle meridian. In English, the number of teeth in each inch (25.4mm) indicates the distance between teeth
The following table lists the tooth distance (Metric) teeth (English) of the commonly used specifications
1. metric self tapping teeth:
Specifications ST1.5, ST1.9, ST2.2, ST2.6, ST2.9, ST3.3, ST3.5, ST3.9, ST4.2, ST4.8, ST5.5,, ST6.3, ST8.0, ST9.5
The range of teeth was 0.5, 0.6, 0.8, 0.9, 1.1, 1.3, 1.3, 1.3, 1.4, 1.6, 1.8, 1.8,, 2.1, 2.1
2. inch self tapping teeth:
Specifications 4#, 5#, 6#, 7#, 8#, 10#, 12#, 14#
Number of teeth AB teeth 2420201918161414
A teeth 2420181615121110
3. day marker wallboard nail:
Specifications 6#, 7#, 8#, 10#
Coarse tooth number 9998
The distances of teeth were 2.82, 2.82, 2.82 and 3.18
Fine tooth number 18161512
The distances of teeth were 1.41, 1.59, 1.69 and 2.11
4. mechanical screws (mechanical teeth):
Metric (pitch) English (tooth count)
Specifications M2.5, M3, M3.5, M4, M5, M6, M8, 4#, 5#, 6#, 8#,, 10#, 12#, 1/4
Coarse teeth 0.45, 0.5, 0.6, 0.7, 0.8, 1, 1.240403232242420
Fine teeth 0.35, 0.35, 0.35, 0.5, 0.5, 0.75, 1.048444036322828
5. drilling screws: drilling screws have CSD (mechanical teeth), BSD (self tapping AB teeth) two kinds of teeth, their spacing or number of teeth can be referred to mechanical screws (CSD teeth) and self tapping screws (BSD teeth)
(four) the angle of Asan and the angle of tail tip: the angle of Asan is the angle between the tooth side and the tooth side, the tail angle is thread, and the end angle is not sharp
1. self tapping teeth: Asan angle is 60O, and the tip angle is 45O + 5O.
2. wallboard nails: Asan angle is 60O, (also according to customer requirements, such as 45O + 5O), the tip angle is 25O + 3O.
3. plywood nails: (Chip, board, screws), Asan angle is 40O + 3O, the tip angle is 25O + 3O or 34O + 3O (customer special requirements)
4. drill tail screw: Asan angle is 60O + 5O, tail for different specifications of products choose different types of tail pin, the tail of the main geometric parameters for pinch tail diameter and protruding amount
