Self tapping and self drilling screw tips

What is a self tapping and self drilling screw???

Self drilling self tapping screw is a type of screw with a drill bit, which is constructed using specialized electric tools to complete drilling, tapping, fixing, and locking in one go. Self drilling and self drilling screws are called self drilling and self drilling screws because they have a drill tail point, and the point is like a Fried Dough Twists drill bit. During assembly, the screw can drill out the central Confucius by itself, and then self drilling and extruding the matching thread in the hole on the carrier with the help of the close thread part. Self drilling self tapping screws are mainly used for the connection and fixation of some thinner parts, such as the connection between color steel plates, the connection between color steel plates and purlins, wall beams, etc. Their penetration capacity generally does not exceed 6mm, and the maximum does not exceed 12mm.

Self drilling and self tapping screws are often exposed outdoors and have strong corrosion resistance; Its rubber sealing ring can ensure that there is no water leakage at the screw and has good corrosion resistance.

Material of self drilling and self tapping screws:

According to the material, it can be divided into: steel 1022A, stainless steel 410, and stainless steel 304.

1. Carbon steel drill tail screw, 1022A, standard heat treated steel can be used as the material for drill tail screw production. After heat treatment, the surface hardness is HV560-750, and the core hardness is HV240-450. Ordinary surface treatment is prone to rusting, high hardness, and low cost;

2. Stainless iron drill tail screw, 410, heat treatable, with better rust resistance than carbon steel but worse than stainless steel;

3. Stainless steel drill tail screw, 304, cannot be heat treated, has strong rust prevention ability, low hardness, high cost, can only drill aluminum plates, wooden boards, and rubber plates;

4. Composite drill tail screws, drill bits are produced using carbon steel, and threads and heads are produced using a process combining 304 stainless steel.

Under what circumstances are self tapping screws used, and under what circumstances are self tapping and self drilling screws used?

1. Self tapping screws are commonly used for connecting thin metal plates (such as steel plates, saw boards, etc.). When connecting, first create a threaded bottom hole for the connected part, and then screw the self tapping screw into the threaded bottom hole of the connected part. Due to the high hardness (≥ 45HRC) of the threaded surface of self tapping screws, internal threads can be tapped into the threaded bottom hole of the connected part, thereby forming a connection.

2. Self drilling and self tapping screws can be directly drilled, threaded, and locked on the set material and basic material in one go, and can be quickly and automatically drilled and directly tightened for fixation; The construction efficiency of self drilling and self tapping screws is extremely high; It saves construction time, improves construction efficiency, and enhances the economic benefits of the boss. The self drilling and self tapping screws riveted to the connected parts have strong bonding force, high pre tightening force, and high stability of the connected parts.