self tapping screw.mp4

The head comes in all Tapping Screw. There are Round head Tapping screw (semicircle head), flat head tapping screw, round head flange (with pad), flat head flange (with pad), pan head tapping screw, pan head flange (with pad), countersunk head, countersunk head, cylindrical head, spherical cylindrical head, horn head, hex tapping screw, hexagonal flange head, hexagonal flange head (with pad) head, truss head tapping screw.

Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonize carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonize and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (phosphor), such as wall panel self - tapping screws for phosphor.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.