Choosing the right screw for the job

2015-09-24 06:00

SELECTING the right screws for your project can be confusing, so let’s take a look at the most common screws and how you would apply them to your DIY projects.

Cut screws

This is the one screw that you will use the most. A cut screw has a smooth shank at the top (no thread), and when joining boards together, the smooth shank serves to pull the back board tightly to the front board.

Using a smooth shank screw ensures a tight join without the need for glue. Cut screws have a square-drive head and every pack you buy will have a square bit included.

Chipboard screws

Because chipboard is not a solid board and has a tendency to crumble, chipboard screws are designed to provide more grip. Chipboard screws have a pozidriv head, so always use the right-sized pozi bit (‘PZ’) for your projects. For screws 3.5mm to 5mm, a PZ2 is the correct PZ bit to use.

Zinc chipboard screws

Zinc-plated chipboard screws for smaller projects are available in sizes from 3.0 x 16mm up to 4.0 x 20mm. These screws have a full thread since they are intended for general fastening of hinges, brackets and hooks, and not for joining pieces together.

Top screws tip

All the above screws have a countersink head, which means that you need to use a countersink bit in hardwood and boards to ensure that the screw head sits flush or just below the surface of the material you are using. – Property24

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