Woodscrews - Pozidrive Round
Pozidrive heads have been designed to ensure that the screwdriver will not slip under torque. This makes them ideal for use with impact drivers and other power tools.
The best way to identify a Pozidrive head is by the diagonal engraved lines between the four points of the cross head.
A pan head or round head is a domed raised head which has a flat, level underside to it. Round / pan head fixings were actually designed for fixing against metal surfaces, but they are commonly used to fix to a variety of rigid surfaces. The most commonly used fixing in applications where a flush finish is not a necessity.
As with most types of fasteners, a wide variation of woodscrews is available with the most common types being a twin thread, chipboard, or velocity screw. Each of these types of screws is actually suitable for a large range of applications.
Twin thread woodscrews (both Pozi drive and countersunk) are a traditional woodscrew that gives rapid installation into softwoods. They are also an ideal choice for use with a plastic wall plug when fixing into masonry.
Chipboard woodscrews are best when used with softwoods, chipboard, plastics, and some hardwoods. Many builders and carpenters use chipboard screws as their “go-to” screw for general timber use.
Velocity screws are a premium multi-use screw that can be used with a range of materials including thin sheets, metal, PVC-u, MDF, softwood, and hardwood.
When it comes to the sizing of woodscrews it is still very common to find measurements in both metric and imperial. The diameter of a wood screw is either given in a gauge (imperial), or in millimeters (metric). With the imperial gauge, a number is used, i.e. 8 gauge. A larger gauge number means a larger diameter. Screw gauge numbers actually correspond to a particular fraction of an inch in imperial measurements.
Woodscrew lengths are also often shown in either metric or imperial, or sometimes both.