Countersunk Self Tapping Screw

Head Type: Countersunk 

Thread Type: AB type

Drive: Combination / Pozi / Philips / Slotted

Material: C1022

Diameter: m3.0 / m3.9 / m4.2 / m4.8 / m5.5 / m6.3

Lenght: From 19 mm to 254 mm

Finish: Black / Grey Phosphated,Yellow / Blue White Zinc Plated,Nickel Plated,Dacromet,Ruspert 

Sample:  Accept

Service: OEM/ODM is accepted

Packing: Small box or bulk in carton with or without pallet

  • Description
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As the name suggests, self-tapping screws are screws that can tap the thread into the material. Self-tapping screws are used in a variety of materials, including wood, metal, and brick. These screws cannot drill through metal and require a pilot hole to be pre-drilled before installation. A pilot hole is created by using a drill bit which is slightly smaller than the screw and the threads of the screw tap the metal or wood while the screw is being installed. This knocking action can hold the material together. Self-tapping screws can also have many different types of tips, and these tips help tap the threads into various substrates.

Flat Head Screws, also called Countersunk Screws, are conical with a flat outer face and a tapering inner face. One advantage of this type of screw is that almost no head protrudes to the surface, so the head can be sunk into the material.So these screws are usually made of stainless steel or zinc coating.

Dimension Drawing

Countersunk Self Tapping Screw


  • Thread-tapping screws remove material and create a path for the screw. The drawbacks to using this type of screw is when they are removed it can result in stripped threads. If you experience stripped threads you should use a larger thread-tapping screw when reattachment is made.
  • Self tapping screws  cannot drill through metal and require a pilot hole.Self drilling screws eliminate the need for a pilot hole, but can tap as well.
  • Self-tapping screws have a wide range of tips and thread styles, and almost any screw head design can be used.


  • Railway
  • Wind tower
  • Nuclear power
  • Automotive industry
  • Construction
  • Electronic industry