The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Is it a bad idea to use a Pozidriv screwdriver on a Phillips head? Ask Question. Asked 6 years, 5 months ago. Active 2 years, 9 months ago. Viewed 59k times. The same source mentions the both screwdriver and head should be of the same type: Phillips drivers should not be used with Posidriv screws and vice versa as they tend to ride out of the recess and round the corners of both the tool and screw recess.
Here is a side-by-side comparison of the two driver types Phillips left, Pozidriv right :. Improve this question. Scotty Waggoner 3 3 bronze badges. Zaid Zaid It looks like there are some significant differences in the design.
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. Pozidriv screws, on the other hand, are designed specifically so that the screwdriver head does not cam-out.
Phillips screwdrivers fit in Pozidriv screws, and can turn them. However, they are liable to slippage, and can damage the screw. Pozidriv screwdrivers , on the other hand, do not fit Phillips heads. The easiest way to know whether a screw is Phillips or Pozidriv is that all Pozidriv screws have lines etched the screw head in-between the four arms of the cross.
This visual aid means that you can instantly recognise a whether a screw is a Pozidriv or not. You can also see the difference between a Phillips screwdriver and a Pozidriv, as the latter has the ridges.
To prevent slippage and damaging of screws, you should only use a Phillips head screwdriver on a Phillips head screw, and you should only use a Pozidriv screwdriver on a Pozidriv screw. Call: sales shop4fasteners. Collection of orders only available by prior arrangement. With Pozidriv, the parallel form prevents this force. Phillips screwdrivers can be used for Pozidriv screws, but they do exhibit some play.
Pozidriv screwdrivers, on the other hand, cannot be used for Phillips screws. 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.
Left image: Pozidriv screwdriver in Pozidriv screw The parallel form prevents ejection forces. 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.
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