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         Wood screws

            Traditional wood screws
            Chipboard wood screws
            Universal wood screws
            Wood construction screws
            Basics of wood screws mechanics

         Security fasteners
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         MaxxFast CE screws
         Tube clamp fittings
         Threaded rods
         Wire thread inserts
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         Pop Avdel

TRADITIONAL WOOD SCREWS

Traditional wood screws are used in most types of wood. Predrilling is always advised in order to avoid splitting the wood and breaking the screws. This type of screw has a wide core diameter and a blunt thread. They are available in countersunk (DIN 97), raised countersunk (DIN 95) and round head (DIN 96) types, and the most common drives are slotted and Phillips or Pozidriv cross recesses. The same thread type is also used on hexagon head wood screws (DIN 571).
 

These are the preferred screws to use in plastic plugs because of their wide core and blunt thread, which deforms the plug instead of cutting it, thus providing a larger clamping force. Common materials for these wood screws are steel, brass and stainless steel.

Below is an example of predrilling and one of a wall plug application: 

A should be wood board predrilled entirely through on top with a diameter equal to or slightly larger than the outer shank diameter. The diameter difference is necessary to avoid thread forming and for clamping the materials. Additionally, the countersunk for the head is predrilled. For the bottom board, the drilling diameter should generally be equal to the core of the thread, though it may need to be smaller depending of type of wood. Here, the screw threads into the wood, which provides a clamping force between the two boards. The screw point may be shaped in one of two different styles, depending on the manufacturer’s choice (see image below). 

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