• Category： Self-Drilling Screw
• Available Material: Carbon steel, Stainless Steel, etc. OEM according to your request
• Head types: Hex, Pan, Truss, Countersunk, Wafer etc. Drive types: Hex, cross recess, torx, slotted, etc. OEM according to your request
• Thread size: ST4, ST4.8, ST6.4 etc. Length: 16mm, 18mm, 20mm, 1/2'', 3/4'' ,etc. OEM according to your request
• Finishing : Blue Zinc plated, White Zinc plated, Decromet, Plain, Customized.

Self-drilling screws eliminate the need for a pilot hole but can tap as well. Self-tapping screws tap their own threads but cannot drill through metal and require a pilot hole. These screws are not interchangeable, and mixing up the two can cause many headaches or possible failures in the field.

What is the difference between self-drilling screws and regular screws?

Head and drive styles vary; self-drilling screws are most commonly Phillips, hex, or square. 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.

Some self-tapping screws such as the Tek screw brand, are also self-drilling, which means that in addition to the thread-forming section there is also a fluted tip much like the tip of a center drill. These screws combine hole drilling, threading and fastener installation into one driving motion (instead of separate drilling, tapping, and installing motions); they are thus very efficient in a variety of hard-substrate applications, from assembly lines to roofing. Some types incorporate a sealing washer, for fastening roofing sheets to purlins.