Since nobody seems to have mentioned it, Pozidriv screws
can be identified by a cross type screw slot, with a
set of fine lines stamped in the head in between the
crossed slots (a cross and a cross...). JIS have a single
dot stamped in the head between two of the slots.
Pozidriv screw slots have square sides, which makes it
unlikely that the bit will cam out of the screw's slots...
And, makes it incompatible with phillips screw drivers.
To get the square sides on the driver bit, they have to
use a narrower grinding wheel, which leaves 8 facets on
the screwdriver (as opposed to the Phillips 4 facets.).
JIS and pozidriv bits usually break when the torque is
exceeded. You have been warned.
Torx and square drive are the kings of readily available
high torque screws. Allen is a distant second.
-Chuck Harris
On Sat, 17 Sep 2022 18:26:32 -0500 "Steve Holland via groups.io"
<sholland@...> wrote:
People: I keep learning useful stuff on these threads even when
looking at posts about equipment I don¡¯t own. Pozidrive screws: Great
tip!
Steve
