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Click here to read our privacy policy. Accept Decline. JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. The reason could be because there are two different types of crosshead screws which look similar, but are actually different.
The two types are the Pozidriv and the Phillips. This image shows the sutble difference between a Phillips and a Pozidriv screw head. Phillips screw heads are designed so that the Phillips screwdriver will cam-out slip if too much torque power is applied.
The reason is that this prevents the risk of the screw head being twisted off by a power tool. This can be helpful, because if the head breaks off, a screw is very difficult to move. Right image: Pozidriv screwdriver in Phillips screw The parallel tip cannot penetrate into the conical screw.
This is often the reason why the screwdriver is selected by at least one size lower, which leads to an overloading of the tool. The screwdrivers and bits for Pozidriv screws are marked green:. Tip: In case of doubt, use a Phillips screwdriver. While they do not perfectly fit into the Pozidriv screws, one can at least insert the correct size.
The use of Pozidriv screwdrivers in Phillips screws works only with screwdrivers that are too small and easily leads to damage of the screw or the tool. Pozidriv screw symbol and screwdriver tip with parallel flanks According to ISO standard, the two cross-head screwdriver types are designated as PH for Phillips and PZ for Pozidriv screws.
What are the differences in their application? Advantage of Pozidriv - Disadvantage of Phillips When applying high torques, the conical Phillips form generates an ejection force that pushes the screwdriver out of the screw.
Advantage of Phillips - Disadvantage of Pozidriv Phillips screwdrivers can be used for Pozidriv screws, but they do exhibit some play. Left image: Phillips screwdriver in Phillips screw The conical form leads to ejection forces Right image: Phillips screwdriver in Pozidriv screw The conical screwdriver shows play in the parallel screw.
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