square screwdriver bits

[NoSpam]

I've just failed to undo some screws that I thought were pozidrive they turn-out to be a square drive - can anyone help with what they are called and where I can get a set of square bits or screwdrivers?

[TMC]

Google Robertson bits

Screwfix show a couple of wera brand bits

[Leo]

Robertson. Available everywhere in Canada, specialist item elsewhere.

LEo

[Dr Hfuhruhurr]

I might have a few floating about. what size you after? (ish)

[NoSpam]

Thanks, it's quite easy once you know what they're called!

[NoSpam]

A kind offer but I think I'm sorted now that I know what they're called.

[F Murtz]

Those screws are becoming more and more common every day in the building trade.

[John MacLeod]

BC Hydro used them in their bus fleet to secure the seats and trim and thus defeat vandals. Who promptly equipped themselves with Robertson screwdrivers and continued to dismantle the buses :-)

Seriously, they work rather well, IME.

John

[Dr Hfuhruhurr]

[GB]

It beats me that there isn't one single design of screwhead that gives maximum traction and which everybody uses. Why is (or isn't) that?

[Skipweasel]

There's often a square-drive bit in some of the bigger "assortment" boxes.

[Skipweasel]

The joys of the market economy.

[Halmyre]

I used my electric drill/screwdriver to put some Torx-headed screws into a hardwood window frame the other day and it was great not to have the screwdriver bit slip out or jump in the slots.

[Matty F]

I gather that early on in its life the square drive had patent or licensing problems. I hate all forms of crossed slot heads - I can never tell which of the many crossed drivers to use, and the screws and drivers get damaged very easily.

[AlanD]

Try an impact driver - they don't ride out so easily (as the drive is a series of short bursts), so no slipping.

[GB]

An impact driver has the advantage that it's being pressed extremely hard against the screw head at the same time it's turning.

[Mathew Newton]

That's only true of the manual types though. An automatic/powered impact driver delivers only rotational force.

Mathew

[fred]

The majority of cross head screws I meet are Pozidrive and the vast majority are No 2. The same size is the most popular in Phillips. Pozi

1 are quite small and easily identified. Same goes for Pozi 3. Pozi 4 re very large. Used to hold vehicle door hinges and such I.M.E

The same bit will work both but the Phillips head screw will likley bugger up a Pozi bit.

Paul Mc Cann

[Tim Watts]

fred ( [e-mail]) wibbled on Thursday 20 January 2011 12:51:

Itis rediculus that we are still using a head profile that was designed to solve the opposite problem that nearly 100% of users have these days.

[Skipweasel]

And true Pozi screws will have the graved set of lines at 45=B0 to the=20 slots. These are absent on Philips screws.

have no mechanical function, but serve to help you tell which=20 screwdriver to use.

--=20 Skipweasel - never knowingly understood.