I want to get some Phillips screwdrivers for very small screws.
Most suppliers quote something like this:
"#0 and #00".
However others quote things like this:
"7 Heads Phillips 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0".
How can I work out which is equivalent to which?
Unless you are doing lots of work , I would just get something like this
assortment from China off ebay for about 11 or 12 dollars shipped to you and
not worry about the sizes. I bought a set a while back like it.
On Tuesday, January 13, 2015 at 10:25:15 PM UTC, Arras wrote:
The 'Normal' size is no. 2. A lower number is smaller and a larger number bigger. 1, 2 and 3 cover most things for me. YMMV
Incidentally you do mean Phillips and not Pozi?
A no. 2 pozi suits 4mm pozi screws which are approximately equivalent to No. 8s. That nmight get you started
Are you sure you want Phillips? They are not the same as pozi-drive
which is possibly more common in UK use.
The head of a pozi "normally" has an x on the head rotated 45 degrees to
the main driving faces.
The tip angle of the two standard are different and it becomes quite
critical on the small sizes where the wrong screwdriver can easily wreck
the head of the screw.
Not if you can't buy PoziDrv screws in the USA. As I think I have
written here before, when I ask about PoziDrv screws and bits in the USA
I am greeted by a blank stare -- although many of the imported sets of
bits do in fact include PoziDrv (PZxx). The only PoziDrv screwdriver (as
distinct from interchangeable bits) I own was made in the UK and bought
while I was on vacation in New Zeeland.
On Tuesday, 13 January 2015 22:25:15 UTC, Arras wrote:
This area is a bit of a pain. Philips is fairly common in Europe but Pozidr
ive is also around. I often dismantle microscopes that have tight screws of
all sorts of sizes, these are often JIS as the microscopes are made in Jap
an. Things made in Japan often use them.
This style of screw is really made for insertion during manufacture and hav
e something called cam out. The idea is that the thing driving them will au
tomatically jump out when a certain amount of torque is applied - too much
really as they are usually driven in by powered screw drivers that have clo
sely controlled torque settings.
Philips have a lot of it, JIS more or less the same shape as Philips but le
ss cam out. Pozidrive probably has the least of the lot.
I have all 3 types of screw driver. The JIS are especially important to me
because the screws I undo with them are often very tight. A philips screw d
river seems to fit but as soon as I put a JIS one in it obviously doesn't.
The problem with using the wrong ones is that if the screw is very tight fo
r it's size they jump out and wreck the head. That applies to all of them.
Some shops that sell model car and aeroplane things stock sets of 3 JIS scr
ewdrivers. One of the odd things is that the middle size can be used on mos
t sizes of screw.
If you don't want to damage heads I would be inclined to find out which typ
e you want to undo. I damaged some before I realised what the problem was.
DIY is worse in some ways as screws that are bought might not even state wh
at type they are and the shop might also sell screwdrivers that don't reall
It's a continuous range of sizes, where the smaller ones have
(presumably) been named after the main series: PH 1, 2, 3, 4 are the
'normal' woodscrew sizes but PH0, 00 and 000 are the smaller sizes that
you find in things like laptops.
The smaller ones are normally found in kits such as :
(That's item number 12357 at Toolstation to illustrate, not as any kind
If you have an application that's in the least demanding, you may well
find a cheap set will become mangled on the first use, so it's worth
looking around for some half-decent ones.
There was a recent post on the MegaSquirt forum (a basically US product)
about the correct screwdriver for the small case end plate fixing screws.
Which are pozi style (parallel sides) - and a pozi driver is a good fit.
So I said to use a pozi number 1. Seems not even a decent tool supplier in
the US knew about Pozi.
I've a feeling they may well be ISO or whatever - but pozi bits are a
decent fit and Philips not.
*Isn't it a bit unnerving that doctors call what they do "practice?"
Dave Plowman email@example.com London SW
Hope you can buy the drivers, though. All the electronic stuff I fix -
made usually in the far east - use screws which are closer to Pozi than
Philips. As do all the screws found round a computer. Including those with
a US thread. ;-)
*My designated driver drove me to drink
Dave Plowman firstname.lastname@example.org London SW
The screwdrivers are to open up gadgets (like a wireless doorbell) that are
often made in China. Seems as if I need the JIS screwdrivers but they are
almost impossible to get.
Perhaps a good-fitting well-made Philips screwdriver would work.
I looked at the Wera micro screwdriver range which have got nice big
handles compared to jewellers screwdrivers. However they don't go smaller
(Amazon.com product link shortened)
I want to use the cross slot screwdrivers on electronic gadgets and I don't
think they would have PoziDrv screws. So I think Phillips is perhaps the
The sizes I want are sometimes called jeweller's screwdrivers.
OK as long as you are aware of the difference and the potential for
damage due to poor fit. Screws into plastic will not normally be that
tight but small screws into metal in precision assemblies can be very
tight and will need the correct driver.
Jewellers screwdriver is a generic terms for small screwdrivers
irrespective of the head type they are designed to work with, Pozi,
phillips, flat, torx etc.
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