The free diy home improvement guide with answers to your questions on a wide range of do it yourself projects.

 

Screw types 2

Screw types 1

Chipboard screw

chipboard screwThis is similar to the traditional countersunk type, but has a deeper thread which allows it to grip better in chipboard and the like.

Twin thread

twin threadAs the name implies, this has two deep threads interwoven with each other. The shank of the screw is narrower, which gives the screw greater grip.

Self tapping

self tappingThis is used in harder materials such as metal and fibreglass. A hole, the gauge of the shank, is drilled first. The screw then cuts a thread into the material as it is tightened.

Clutch head

clutch headThis has a unique crosshead pattern which enables the screw to be done up , but not undone. It is used for fitting locks and other security devices.
Before fitting, use an ordinary screw of the same size. This way you'll have a chance to make minor adjustments to your work before finally fitting the clutch head screw which cannot easily be undone.

Dry wall screw

dry wall screwThis is thinner than a normal screw, with a sharper point. The thin head enables it to be driven into the surface of board or studwork easily. It is commonly used on stud walls for fixing the plasterboard, and sometimes the timberwork itself.

Coach screw

coach screwThis has a large hexagonal or square head and is used for decking and garden joinery. A pilot hole should be drilled, and the screw fastened with an appropriate sized spanner or socket.

Screw types 3

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