That's correct. Both Phillips and Posidrive are registered trademarks of the Phillips Screw Company. They are different, but they should interchange. Posidrive is the better one, however.
Reed-Prince drivers are different and generally won't work on Phillips or Posidrive screws.
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----------------------------------------------- Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
The best way of ruining screws and screwdrivers is use a standard phillips screwdriver in a pozidriv screw and vice versa. It will work, but if you need to apply force, the screwdriver will force itself out of the head. At least in my experience, that is.
Guest Keen Nettlefold ? That is interesting. They disappeared off the face of the planet about 20 years ago as far as we down-underites were concerned.
Many years ago I actually got a phone call from the president of the Phillips Screw Company. My guess is that it's now a one-man operation that just selles licenses to make screws and drivers. He admitted that the Phillips and Posidrive screws and drivers were interchangable and were designed to be that way. OTOH, the posidrive combination was designed to be less likely to "cam out" under high torque. I believe the Posidrive driver in a Phillips screw comes in second. Beyond that I have no idea.
It was an interesting and enlightening conversation.
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----------------------------------------------- Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
Reed-Prince drivers look just like Phillips, but they come to a sharp point. I don't THINK I've ever seen a Reed-Prince screw, but one occasionally runs across a R-P driver.
Phillips points are blunted, which means that you have to choose the right driver (#2 is most common) for the screw you're after or it won't fit properly. If you try to use a R-P driver in a Phillips screw it won't seat deep enough, leading to disappointment. I suspect that a Phillips driver would work in a R-P screw, but I may not have tried, or I might have tried and succeeded without knowing....
The most common problem that I see with Phillips drivers is choosing the wrong size bit. Using a #2 driver in a #3 screw head just doesn't work.
With all the Phillips screws in computer cases these days, I'm continually impressed with the quality of the fit to my drivers. I'd expect these screws to come with poorly made heads, but they always fit the drivers extremely well. I wish this was the case with ALL the things I work on.
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----------------------------------------------- Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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