What are the characteristics of self tapping screws
Self tapping screws are mostly used for the connection between thin metal plates. When connecting, first make a threaded bottom hole for the connected piece, and then screw the self-tapping screw into the threaded bottom hole of the connected piece. So what are the characteristics of self tapping screws? Next, I will introduce the characteristics of self tapping screws in detail for everyone.
1. Generally made of carburized steel (accounting for 99% of all products). It can also be made of stainless steel or non-ferrous metals. The product must be heat treated. Carbon steel self tapping screws are subjected to carburizing treatment, and stainless steel self tapping screws are subjected to solution hardening treatment. self tapping screws meet the required mechanical properties and performance.
2. The surface of self tapping screws needs surface protection treatment, usually electroplating treatment. The surface of some products requires phosphate treatment (phosphate). For example, wallboard self tapping screws are mostly phosphate. Produced by cold heading technology. In order to ensure product quality, it is recommended to produce high-speed cold heading machines and high-speed massage machines or high-speed planetary roller machines. The self tapping screws produced in this way are shaped with high thread quality.
3. The product has high surface hardness and good core toughness. "Inner and outer rigid." This is a major feature of the performance requirements of self tapping screws. If the surface hardness is low, the toughness of the core part that cannot be screwed into the substrate is poor, and the screw cannot be used after breaking. Therefore, the "internal soft outer rigid" self tapping screws meet the requirements of performance.
4. Produced by cold heading process. High-speed cold heading machines and high-speed wire rolling machines or high-speed planetary thread rolling machines are recommended. The emphasis on high speed here is to ensure product quality. Only the self tapping screws produced by high-speed machines have a good head shape and high thread quality.
5. The surface of the product requires surface protection treatment, usually plating treatment. The surface of some products must be treated with phosphate (phosphating), such as wallboard self tapping screws are mostly phosphating.
The above is the introduction of the characteristics of self tapping screws. I hope that everyone will be helpful after understanding the characteristics of self tapping screws.
