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PH3 and larger screwdrivers

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Fred

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Jul 20, 2010, 5:09:00 PM7/20/10
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Hi,

I saw a PH3 screwdriver listed in a catalogue. I just wondered if
anyone had ever seen/used a PH3 screw?

Is there anything above PH3 and PZ3? What's the widest flat blade
screwdriver you can have before you call it a chisel?!

TIA

fred

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Jul 20, 2010, 5:42:12 PM7/20/10
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In article <ev3c46pv0t66k1efu...@4ax.com>, Fred
<fr...@no-email.here.invalid> writes

>Hi,
>
>I saw a PH3 screwdriver listed in a catalogue. I just wondered if
>anyone had ever seen/used a PH3 screw?
>
PZ3 is common for larger size screws, I have driven moderate length #12
screws with these heads and they have been fine but I've had bother with
larger frame fixings that use PZ3, the bit just can't transmit the
torque reliably without the risk of destroying the screw thread.

For larger fixings I now pay a little extra for torx head screws and
I've not had a failure since.

>Is there anything above PH3 and PZ3? What's the widest flat blade
>screwdriver you can have before you call it a chisel?!
>

Googling for Pz4 suggests they do exist, dare you search higher?
--
fred
FIVE TV's superbright logo - not the DOG's, it's bollocks

TMC

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Jul 20, 2010, 5:51:13 PM7/20/10
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"fred" <n...@for.mail> wrote in message news:IJEyu1B0ghRMFwTo@y.z...

I have both pz3 and pz4 on my toolrack made by stanley and bought many years
ago

Think I may have once used the pz3 but cannot recall ever using the pz4

Regards

dave

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Jul 20, 2010, 5:56:00 PM7/20/10
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On 20/07/2010 22:09, Fred wrote:
> Hi,
>
> I saw a PH3 screwdriver listed in a catalogue. I just wondered if
> anyone had ever seen/used a PH3 screw?

I had to buy one many years ago to adjust the hinges of a car. Can't
remember what the car was, nor where the screwdriver is at the moment.
That was the largest one I ever bought.

> Is there anything above PH3 and PZ3?

Probably, but I have never come across anything bigger than a size 3 head.

What's the widest flat blade
> screwdriver you can have before you call it a chisel?!

When I was on the tools working on Tornado development aircraft, the
forward jacking point blank was approaching an inch and a half head
diameter. Your average DIY screw driver would just make a mess of the
slot in quite a short time.

But surely, a screwdriver could never be considered a chisel, even
though a screw driver is used in many situations other than screw
driving :-)


Dave

NT

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Jul 20, 2010, 7:44:41 PM7/20/10
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No 3 is standrd on flatpack fittings


NT

d...@gglz.com

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Jul 21, 2010, 2:45:42 AM7/21/10
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Screwfix turbogold 6mm, and Spax 6mm screws, both PZ3.

Fred

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Jul 21, 2010, 3:11:23 PM7/21/10
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On Tue, 20 Jul 2010 22:42:12 +0100, fred <n...@for.mail> wrote:

>PZ3 is common for larger size screws, I have driven moderate length #12
>screws with these heads and they have been fine but I've had bother with
>larger frame fixings that use PZ3, the bit just can't transmit the
>torque reliably without the risk of destroying the screw thread.

Thanks everyone for the replies so far. A lot of people are posting
about PZ3. I think they are quite common; I was wondering more about
PH3: has anyone ever seen or used those?

Re. PZ3 I have encountered them on 12 gauge screws. What do you
consider a moderate length? I think I have used up to 4 inch screws
without problems.

I tend to use hammer fixings rather than frame fixings, though is
their really any difference? The only difference I can see is that
frame fixings have those two protrusions at the end, which I think are
supposed to stop them rotating, though why would rotation be a problem
when they are a symmetrical design? I read somewhere that hammer
fixings use a stronger screw to take the force of being hammered but I
wonder whether manufacturers really use two different types of screw
in frame and hammer fixings? Wouldn't it be cheaper and easier for
them to sue the same in both? I accidentally hammered in some frame
fixings the other week (I wasn't concentrating when I bought them) but
they seem to have survived!

Thanks.

Fred

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Jul 21, 2010, 3:16:11 PM7/21/10
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On Tue, 20 Jul 2010 16:44:41 -0700 (PDT), NT <meow...@care2.com>
wrote:

>
>No 3 is standrd on flatpack fittings

Really? Do you mean for cam locks, like these:

http://www.screwfix.com/prods/45045/Fixings/Furniture-Fixings/Cam-Lock-15mm-Pack-of-50

I saw these in an Ikea cupboard once but I never realised they were
PH3; I think I used a slotted driver. At last a PH3! Thanks.

Andy Dingley

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Jul 21, 2010, 6:45:43 PM7/21/10
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On 20 July, 22:09, Fred <f...@no-email.here.invalid> wrote:

> Is there anything above PH3 and PZ3?

I've got a Pz4 (Wiha) and used it a few times for door frame fixings.


> What's the widest flat blade
> screwdriver you can have before you call it a chisel?!

Screwdrivers have flat ends to their blade, so never.

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