Features of self-tapping screws

May 05,2022 / BY DEVELOPERS

Although there are many types of self-tapping screws, they all have the following common features:

(1) It is generally made of carburized steel (99% of the total output). Also available in stainless steel or non-ferrous metals.

(2) The product must be heat treated. Carbon steel self-tapping screws must be carburized, and stainless steel self-tapping screws must be solution hardened. In order to make the self-tapping screw meet the mechanical properties and performance required by the standard.

(3) The product has high surface hardness and good core toughness. That is, "inner softness and outer rigidity". This is a major feature of the performance requirements of self-tapping screws. If the surface hardness is low, it cannot be screwed into the matrix; if the toughness of the core is poor, it will break as soon as it is screwed, and it cannot be used. Therefore, "inner soft outer steel" is a very important requirement for self-tapping screws to meet the performance requirements.

(4) The surface of the product needs surface protection treatment, generally electroplating treatment. The surface of some products must be treated with phosphate (phosphating), such as wallboard self-tapping screws are mostly phosphated.

(5) Produced by cold heading process. It is recommended to use high-speed cold heading machine and high-speed thread rolling machine or high-speed planetary thread rolling machine for production. The emphasis here is on high speed to ensure product quality. Only self-tapping screws produced by high-speed machines have well-formed heads and high thread quality

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