Although there are widespread usage and availability in industrial, construction, and commercial applications, many people are still confused between self-drilling screws and self-tapping screws. The self-tapping screw fastener manufacturer provides you various shapes of self-tapping screws like pointed, flat, or blunt. On the other hand, the self-drilling screw manufacturer makes the difference easy as the drilling screw is not pointed. The self-drilling screws are curves at the end, shaped like a twist drill. Let’s read these two screw types separately to understand the difference clearly.
If you focus on the point of the self-drilling screws, you can easily distinguish the difference. The length of the self-drilling screws vary, but the drill points are identifiable, standardized by 1-5 numbers. This range determines the thickness and length of the self- drilling screws. Drive and head style of the screw also vary; they are most commonly hex, Philips, or square. Self-drilling screws do not require a pilot hole to fasten and cut. These screws can tap, drill, and fasten in just one go, which saves you from the extra drilling step then fastener. The self-drilling screws can attach wood to metal, metal to metal and also work fine with low-density, light materials. Generally, when it comes to competition, self-drilling screws have more specialized applications as compare to self-tapping screws. They are good for light gauge metal and metal building assemblies. They are useful in cladding, steel framing, metal roofing, and other construction tasks.
The self-tapping screws are also known as sheet metal screws, metal screws, tapper screws, or tapping screws. The screw is tread-cutting, creating threads in pre-drilled holes if the self-tapping screw is pointed like a pencil. The screw is thread rolling, extruding threads, and create zero between material and the screw if the screw tip is flat. The most highlighted difference is that without a pilot hole, self-tapping screws cannot go into the metal, it should be pre-punched or pre-drilled. Accurate punch and drill hole sizes are very important. If the hole is too big, the-drilling screw becomes loose and does not thread securely and properly. Moreover, if the drilling hole is too small then the screw can break or crack the material. It is good for using with metals, forged, or cast material such as aluminum, bronze, iron, or brass, and different plastic types like fiberglass, plywood, polycarbonates, etc. A common application of the self-tapping screws includes attaching metal brackets, fastening sections of aluminum, attaching metal brackets, or injecting screws into plastic materials.
Differences and similarities:
- These screws form threads as both penetrate with the material.
- When bolts and nuts or rivets cannot work with, these two attach with steel on steel as well as steel on wood.
- Self-drilling screws save time and costs at assembly time.
- Self-drilling reduces the error in installation as if the pre-drilled holes are the wrong size.