What are the types of self-tapping screws?

Jun 16,2022 / BY DEVELOPERS

According to the development and evolution of self-tapping screws, we believe that the main types of self-tapping screws are as follows:

1. Ordinary self-tapping screws

The thread is "self-tapping thread", also known as "wide thread". The surface is mostly electroplated.

2. Self-cutting and self-tapping screws

The Chinese standard is called "scraping end of self-tapping screw", the thread is self-tapping thread or machine thread, and the cross groove is also "H" type. There are several types of self-cutting self-tapping screws: cross recessed pan head self-cutting self-tapping screws, cross recessed countersunk head self-cutting self-tapping screws. Cross recessed countersunk head self-cutting self-tapping screws, hexagon head self-cutting self-tapping screws.

3. Self-extrusion self-tapping screws (self-tapping locking screws)

The threads of self-extrusion self-tapping screws are generally machine threads, and self-tapping threads are rarely used. In the wrenching method, in order to ensure the use of high-speed automatic assembly wrench, slotting is generally not recommended. The cross section of the screw of the self-extrusion self-tapping screw is triangular. So it is also called triangular thread screw.

4. Self-drilling and self-tapping screws (self-drilling screws)

The thread of self-drilling self-tapping screw, Chinese, German and international standards are self-tapping thread. In the American ASME and SAE standards, the BSD self-drilling self-tapping screws are self-tapping threads, and the CSD self-drilling self-tapping screws are machine threads. Self-drilling self-tapping screws are not recommended for "slotted" and "normal hex head".

5. Metal driving screws (metal tapping screws)

The thread of the metal drive screw is multi-start and has a special thread with a certain helix angle. Only the American standard has metal drive screws, and there are no Chinese and German standards.

6. Wall panel self-tapping screws (dry wall nails)

White tapping screws for wall panels are special threads with horn head, cross groove (H type) and 60° profile angle, and the surface is mostly phosphate treatment (phosphating).

7. Fiberboard nails

The cross groove is Z-shaped, and the surface treatment is mostly electroplating. There are several types of fiberboard nails: countersunk head, double countersunk head fiberboard nails, pan head, pan head flange (with pad) fiberboard nails, half-countersunk head, semi-countersunk head flange (with cushion) fiberboard nails.

8. Combination self-tapping screws

Ordinary self-tapping screws, self-cutting self-tapping screws, self-drilling self-tapping screws, etc., combined with flat washers, elastic washers (including spring washers, elastic locking washers, etc.). Self-tapping screws.

9. Other self-tapping screw types

High and low thread double lead self-tapping screws, coarse and fine thread (different pitch) thread self-tapping screws, threads coated with sealing material (fall resistance) self-tapping screws, various compound groove self-tapping screws, other special design juice self-tapping screws, etc.

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