"Morgans" wrote in message
...

"Private" wrote

snip
Also, deck screws with a square drive are around. It may be that if there
is still a royalty for using Robertson screws, they got around it in an
innovative way. These screws I am talking about can be driven by a
Phillips head driver (very poorly, though) but have the inside of the
Phillips slots enlarged so that a square drive will fit in it. If you
keep a reasonable amount of pressure on them, they WILL not slip.

I look forward to seeing more and different kinds of hardware showing up
with square drives. I'll switch every one out that I can find!
--
Jim in NC

I have not seen this type of decking screws but have been using some
European screws for assembling cabinet boxes that have this type of head.
IIRC they are called 'Conformat' and AFAIK are really designed for particle
board but are great for plywood. They have great clamping force but are not
pointed and do not tend to split the plys when screwed into the endgrain,
they do require a $pecial $tepped drill bit. They have a very sharp but
coarse pitch thread with a large flat landing at the root of the thread,
something like this --^----^----^----^----^-- These screws can also be
driven with either a big Philips or a #2 Robertson.