People often confuse self-drilling screws with self-tapping screws. Self-tapping screws/fasteners tap their own threads, but cannot drill through hard objects such as metal. Self-tapping screws require a pilot hole for proper installation, but self-drilling screws do not require any pilot holes. In terms of similarities, self-tapping screws and self-drilling screws can self-tapping threads, but generally speaking, self-tapping screws have a higher number of threads than self-tapping screws.
In short, all self-drilling screws are a type of self-tapping screws, but not all self-tapping screws are self-drilling screws. Due to the above differences, these screws cannot be used interchangeably, and mixing them may cause some A headache at the very least.
Self-drilling screws reduce installation time. They're also fairly easy to use, as just a drill is all you need to secure them. Therefore, these screws save time and money.
Just like any other form of metal screw, self-drilling metal screws are available in a variety of sizes:
Diameter and length
When using stainless steel fasteners, we must pay attention to some things to ensure their durability and long life. Common mistakes people make when using fasteners are:
Fastener Selection: One of the most common mistakes people make when selecting fasteners is choosing the incorrect grade and type of material. We have to choose fasteners made of stainless steel, brass or plastic depending on the application. Stainless steel resists corrosion and is affordable. Brass is best for brazing, while plastic is great for underwater use.
Choice of surface treatment: Steel fasteners develop cavities and roughness, which can cause small particles to deposit on the screw, which can cause stains or an unsightly appearance of the screw. Therefore, it is very important to choose the best surface finish to achieve good corrosion resistance.
Composition of fasteners: Due to the lack of chromium in their composition, most steel screws will rust faster than stainless steel screws with sufficient chromium content. in their composition.
Galvanic Corrosion: Galvanic corrosion is a phenomenon in which two dissimilar metals corrode after charging through electrical contact. To avoid this, we can use nylon washers, which can effectively ensure that the stainless steel fasteners do not come into contact with other metal panels.
Maintenance: Regular maintenance and cleaning have a major impact on the durability of your fasteners. Prolonged exposure to water and contaminants can affect the life and appearance of fasteners. Therefore, we must ensure planned and regular maintenance and cleaning of fasteners.
How to use drill tail screws correctly
The best way to use self-drilling screws is with a power drill or power screwdriver. You can optionally create a pilot hole, this will ensure that your metal screws line up perfectly with the holes. The diameter of the pilot hole should be slightly smaller than the diameter of the screw, otherwise the thread of the screw will not be able to effectively seize. Typically, self-drilling screws do not require pilot holes, which is considered one of the benefits of using these screws. Once you've aligned the screws with the layout, it's time to tighten, but make sure you don't overtighten. Overtightening can dislodge the screw head, making it difficult to remove the screw.