RS PRO Bright Zinc Plated Steel Self Drilling Screw M4.8 x 16mm Long

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RS PRO Bright Zinc Plated Steel Self Drilling Screw M5.5 x 25mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M4.2 x 19mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M4.8 x 25mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M5.5 x 19mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M5.5 x 32mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M4.8 x 19mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M4.2 x 1in Long x 25mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M4.2 x 13mm Long

RS PRO Bright Zinc Plated Steel Self Drilling Screw M5.5 x 38mm Long


A Self-drilling screw is, essentially is a self-tapping screw with the added feature of a drill point end. Self-drilling screws eliminate the need for a pre-drilled pilot hole as they perform the drilling, tapping and fastening in one action. Hardened steel fixings are generally used when fixing metal to metal or metal to timber. You can learn more in our [guide to self-drilling screws](https://uk.rs-online.com/web/content/discovery/ideas-and-advice/self-drilling-screws-guide).

There are a few key things to think about when deciding what the best screw is for any application. With self-drilling the main points are;

### Flute Length

The flute length on a self-drilling screw is the small section at the end of the fixing. The length will determine the thickness of the metal the fastener can be used with. The flute is the part of the self-drilling screw that sends the drilled material out from the hole. If this area becomes blocked the cutting action will eventually stop. Failure to rectify can result in overheating

### Drill Point

When deciding on the length of the fixing, the length of the material the screw has to go through must be carefully thought about. The drill point is the small unthreaded section at the end of the screw. If the thread engages before the drill point is all the way through the screw will become damaged or break.

### Types of self-drilling screws

Self-drilling screws are available in the same head shapes and drive types as self-tapping screws. The material and finish or plating of the screw are dependent on the materials the screws will be used with and the environment they will be subjected to.

#### Head Shapes
- Hexagon Washer Head
- Hexagon Flange Head
- Countersunk
- Pan Head
- Button Head
- Drive Types
- Hexagon
- Cross
- Pozi

With regards to the thread type, there are two main categories available metric (mm) thread and UTS (Unified Thread Standard).

#### Applications

Self-drilling screws are ideal for applications where the fastening of two materials is required. As the drilling and fastening is completed in one motion self-drilling screws are particularly useful in a variety of environments where accuracy and speed are of the essence. Some of the most common are;

- Cladding and roofing
- Steel frames
- Metal and wood frames
- Car production lines
- Sheet metal work
- HVAC ducting


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