Introduction

Countersunk Head Self Tapping Screw is used for all sorts of material including wood, metal, and brick. Self tapping screws also called sheet metal screws, are very versatile. They can be used to securely fasten metals together.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.

A countersunk or as regularly shortened as CSK Screw is a fastener that is sunk into a piece of lumber. The heads of the Stainless Steel Countersunk Screw will sit below the surface of the material. 

Dimension drawing

Countersunk Head Self Tapping Screw

The difference between self-tapping screws and self-drilling screws

• The most important difference between self-tapping and self-drilling screws is that self-tapping screws cannot go through metal without a pilot hole, which must be pre-drilled or pre-punched.
• Unlike self-tapping screws, self-drilling screws need no pilot hole to cut and fasten; they can drill, tap, and fasten in one go, which saves you the extra step of drilling, then fastening.
• etween these two, however, self-drilling screws offer two distinct advantages: time and costs saved at assembly time, and reduced error in installation, which often happens if one pre-drills holes in the wrong size.

 Applications

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