What is tapping screw?

Each tapping screw is composed of three parts: the head, the rod and the end of the rod. Each Tapping Screw is composed of four elements: head shape, Screw mode, thread type and end form.

The head comes in all shapes. There are round head (semicircle head), flat head, round head flange (with pad), flat head flange (with pad), pan head, pan head flange (with pad), countersunk head, countersunk head, cylindrical head, spherical cylindrical head, horn head, hexagonal head, hexagonal flange head, hexagonal flange head (with pad) head.

Screwing mode refers to the way to twist the screw head when installing and fastening screws. There are two basic modes: external screwing and internal screwing. In general, the outer twist allows more torque than any type of inner twist (inner groove). Screw: hexagonal, hexagonal flange, hexagonal flange, hexagonal flower shape, etc.; Screw inside: a word groove, cross groove H, cross groove Z, cross groove F, square groove, compound groove, inner spline, inner hexagon flower shape, inner triangle, inner hexagon, inner 12 Angle, clutch groove, six blade groove, high torque cross groove, etc.

There are many kinds of threads, including self-tapping (wide thread), machine thread (normal thread), drywall screw thread, fiberboard screw thread, and some other special threads. In addition, thread can be divided into single lead (single head), double lead (double head), much lead (long) and high and low tooth double thread.

tail-end are two kinds of end forms: cone end and flat end. However, according to the use needs, in the end of the screw-in part, can be processed with cutting function of groove, groove, cut or similar to the shape of the drill bit. In some standards, also cone end or flat end, there are different forms such as round end.