I believe the Roberts (square drive recess) is better in many ways. It
stays on the driver "no hands" pretty well without needing magnetism.
The recesses "strip out" less frequently than Phillips do, which means
the bits will last longer, 'cause they wear when they spin in the screw
The Pozidrive recess is a good compromise, Screws can be reliably driven
in initial assembly with the correct bit, but they can be removed for
servicing by anyone with a plain Phillips screwdriver.
McFeelys has a lot to say about square drive screws.
Note that the square drive screws and drivers usually available
to Americans are not really Robertson (not "Roberts" ;-).
The patented Robertson driver has a slight taper, and slightly
rounded corners. US "square drive" is not tapered and has very
A "fresh" US square drive driver and a "real" robertson screw head
stick _so_ tightly that it can take a significant yank to get them
disengaged. This is advertised as a selling point of the US
square drivers here.
Unfortunately, if you have a pop-out, the driver is usually immediately
ruined and is difficult to use from then on.
Real robertson drivers do not suffer from this with Robertson
screws. So, while they don't stick quite so tightly, the drivers
really do last a long time, and they're just as good at keeping
grip under power.
I really don't know how well the US square drive work with
US square drive screws. Or Robertson drivers with US screws.
Yeah, extols the virtues of Robertson screws without telling you
that the screws you buy from them aren't Robertson ;-)
[Or, at least, I don't think they are.]
Chris Lewis, Una confibula non set est
It\'s not just anyone who gets a Starship Cruiser class named after them.
Depends on who is doing the work. I have much less problems with the square
drive, but my son keeps stripping out the heads and driver. OTOH, my son
has no problems using the Phillips screws and driver and I keep stripping
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