The definition of screw refers to self-tapping screws that do not need to be used with a nut. The thread is self-tapping and has a pointed end. When the triangular teeth self-extrusion screw is screwed into the hole in the plastic metal material, it is pressed into the hole to form the internal thread and form a reliable locking thread connection.
Screws generally refer to self-tapping screws that do not require the use of nuts. Precision Screws Small screws, also known as tiny screws, are tiny fasteners that connect the material of the product. They are tiny in shape, but they can play a key role in the production of key parts. Widely used in electronics, electrical, electrical appliances, furniture, machinery and equipment. The heads of the screws are very classified, with hexagonal heads, pan heads, countersunk heads, and hexagonal heads. Umbrella heads, with heads and so on. The tail is generally tipped. Make self-tapping effect.
Self-tapping screws are also called self-tapping screws. The name is not the same, but the meaning is the same. It is all self-tapping. The main function of self-tapping screws is that they do not need to be used with nuts. In terms of cost, a large number of them are saved. There is no need for a nut cost.
Main features of screws Stainless steel (stainless acid-resistant steel) Although there are many types of screws, they all have the following main features
(1) It is generally made of carburizing steel (99% of the total product). Electrical screws are "quantity products" and are not hand-made artworks. In mass production, they are aimed at achieving high-precision, stable quality and consumer prices. It can also be made of stainless steel (stainless acid-resistant steel) or non-ferrous metals.
(2) Product must undergo heat treatment (chǔ lǐ). Carbon steel self-tapping screws must be carburized (chǔ lǐ), stainless steel (stainless acid-resistant steel) screws must be solid solution hardening (chǔ lǐ). So that the self-tapping screws meet the standard requirements of mechanical properties and performance.
(3) Product has high surface hardness and good toughness in the core. That is "inner soft outside just." This is a major feature of the stainless steel (stainless acid) screw performance requirements. If the surface hardness is low, the screw cannot be inserted into the base body; if the core has poor toughness, the screw can be cut off and cannot be used. Therefore, "inner soft outer rigid" is a self-tapping screw that satisfies the performance requirements.
(4) The surface of the product (Product) needs surface protection (chǔ lǐ), which is usually electroplated. Precision Screws Small screws, also known as tiny screws, are tiny fasteners that connect the material of the product. They are tiny in shape, but they can play a key role in the production of key parts. Widely used in electronics, electrical, electrical appliances, furniture, machinery and equipment. Some products require phosphate treatment (phosphating). For example, wall tapping screws are mostly phosphatized.
(5) Cold heading process. It is recommended to use high-speed cold heading machines and high-speed thread rolling machines or high-speed planetary thread rolling machines to ensure the quality of products. The self-tapping screw head produced in this way is well formed and the thread quality is high