Types of self-tapping screws
The head of the self-tapping screw is pointed and has threads. It can be used when drilling is required. It is mainly used in wall panels, furniture, roofs and other places. The following describes the types of self-tapping screws for everyone, I hope to help you.
1. Ordinary self-tapping screw thread is "self-tapping thread", also known as "wide tooth thread". The surface is mostly electroplated.
2.Self-cutting and self-tapping screws
The tapped end of the self-tapping screw, the thread is self-tapping or machine thread, and the cross groove is also "H" type. There are several types of self-cutting tapping screws: cross recessed pan head self-cutting tapping screws, cross recessed countersunk head self-cutting tapping screws. Cross recessed countersunk head tapping screws and hexagonal head tapping screws.
3.Self-extrusion and self-tapping screws
The threads of self-extrusion tapping screws are generally machine threads, and self-tapping threads are rarely used. In the tightening method, to ensure the use of high-speed automatic assembly wrenches, slotting is generally not recommended. The cross section of the self-extruding self-tapping screw is triangular. So it is also called triangle thread screw.
4.Self-drilling and self-tapping screws
Self-drilling self-tapping screw threads. Chinese, German and international standards are self-tapping threads. In the American ASME and SAE standards, BSD self-drilling self-tapping screws are self-tapping threads, and CSD self-drilling self-tapping screws are machine threads. Self-drilling and self-tapping screws are not recommended for "slotted" and "ordinary hex head".
5.Metal drive screw
The metal drive screw has multiple threads and a special thread with a certain helix angle. Only the American standard has metal drive screws, not in our country and German standards.
6.Wallboard self-tapping screws
Wallboard white tapping screws are horn heads, cross recess (H type), special thread with 60 ° tooth angle, and the surface is mostly phosphate-treated (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) fiber board nails, half countersunk head, semi countersunk head flange (with pad) fiber board nails.
8.Combined self-tapping screws
General self-tapping screws, self-cutting self-tapping screws, self-drilling self-tapping screws, etc. combined with flat washers and elastic washers (including spring washers and elastic lock washers).
9.Other self-tapping screw types
High- and low-thread double-lead self-tapping screws, thick and fine-threaded (different pitch) threaded self-tapping screws, threads coated with sealing material (fall-resistant), various compound slot self-tapping screws, other special setting Self-tapping screws and so on.
The above is the introduction of self-tapping screw types. I hope that after you understand the type of self-tapping screws, it will be helpful for you to choose self-tapping screws.
