Phillips is meant to slip, on purpose. It is designed so factory workers in the past, who used manual drives, could quickly assemble things without over torquing the screws. Just go firm and continuous until the thing slips, then switch to the next step, if you have to use force to avoid slip, you are doing too much. It was simple and easy. Pozidrivs are meant to withstand and impart way much more torque, but, they are supposed to be used with a torque limited electric drive. So assemblers, and even robots, can do the job fast and to exact torque specifications. The result is that people use PZ drives on PH screws and immediately obliterate them, because the drive has too much grip. While the PD drive fits PZ screws but won’t grip and will slip much more, causing a ton of damage to both screw and drive. It is not entirely the material’s fault. Using the wrong drive or choosing the wrong screw head is what usually leads to failures.
The screws included with some items are such pot metal rubbish that they practically strip themselves out. I bought a few assorted packs of hex head cap screws and torx head wood screws so I can replace the included screws when they actually matter.
And this is why I buy torx acres for anything I’m building myself. Unfortunately most premade things I buy have this crappy screw type.
Phillips is meant to slip, on purpose. It is designed so factory workers in the past, who used manual drives, could quickly assemble things without over torquing the screws. Just go firm and continuous until the thing slips, then switch to the next step, if you have to use force to avoid slip, you are doing too much. It was simple and easy. Pozidrivs are meant to withstand and impart way much more torque, but, they are supposed to be used with a torque limited electric drive. So assemblers, and even robots, can do the job fast and to exact torque specifications. The result is that people use PZ drives on PH screws and immediately obliterate them, because the drive has too much grip. While the PD drive fits PZ screws but won’t grip and will slip much more, causing a ton of damage to both screw and drive. It is not entirely the material’s fault. Using the wrong drive or choosing the wrong screw head is what usually leads to failures.
The screws included with some items are such pot metal rubbish that they practically strip themselves out. I bought a few assorted packs of hex head cap screws and torx head wood screws so I can replace the included screws when they actually matter.