Mickle's tip of the day - Screwdrivers

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Screwdrivers? I hear you ask. Screwdrivers?

Forgive me if you already know this, but I've met plenty of professional car mechanics, bike mechanics and plumbers who don't.

There is more than one kind of 'cross-head' screwdriver pattern - and they are not compatible.

The two most common, and most commonly confused, are Phillips and Pozi-drive. And to make it even more complex they also come in sizes: 00, 0, 1, 2, 3 etc. A phillips screwdriver will not fit into the head of a Pozi screw and vice versa, and a #2 Pozi driver will not drive any screw size other than #2.

If you ever wondered why your screw heads were being mashed beyond usefulness by your screwdriver this is why. As a bike mechanic it was an everyday occurance to work on a bike which had had its adjustment screws mullered by nothing more than use of the wrong driver. Learning the difference between the two was one of the best things I ever did for my blood pressure and mental wellbeing. I highly recommend that you learn how to identify them. Your bike components and shelf brackets will thank you for it.

One of the best tools in my box is a Stanley ratchet screwdriver. It uses individual driver bits which can be stored in the handle and I rarely need to use anything else.
 

twobiker

New Member
Location
South Hams Devon
I thought you meant car drivers unsure.gif
 

Moodyman

Legendary Member
One of the best tools in my box is a Stanley ratchet screwdriver. It uses individual driver bits which can be stored in the handle and I rarely need to use anything else.

Totally agree. The best tool in my non-cycling toolbox.
 

LosingFocus

Lost it, got it again.
The two most common, and most commonly confused, are Phillips and Pozi-drive.

Hold on Mickle... Pozidriv is just a Phillips with an extra "cross pattern" on the head, so a Phillips driver can screw a pozi screw fine, but not the other way round. A Phillips is different to a Crosshead, and a Crosshead driver cannot be used properly in a Phillips screw...
 

RecordAceFromNew

Swinging Member
Location
West London
Hold on Mickle... Pozidriv is just a Phillips with an extra "cross pattern" on the head

I don't think that is it.

Especially if/when its steel is not that great, mixing size/type either way will damage the screw head because the profiles of the contact surfaces are different, and if the screw is made of better steel than the (cheap) screwdriver, well, it will be the screwdriver that gets chewed up.

Great advice Mickle!
 

Zoiders

New Member
Hold on Mickle... Pozidriv is just a Phillips with an extra "cross pattern" on the head, so a Phillips driver can screw a pozi screw fine, but not the other way round. A Phillips is different to a Crosshead, and a Crosshead driver cannot be used properly in a Phillips screw...
No they aren't.

A Phillips only has the four blades but the big difference is the following.

No matter what size phillips screwdriver you use the thickness of the blades and the angle/taper of them remains the same from tip to shoulder of the head, this means that any larger phillips will still engage at the tip with a smaller phillips screw size.

Pozi drive they actualy scale up all the dimensions of the tip as you go up through the sizes, the blades are thicker and the tip is blunter and wider.

You can if you have to get away with stuffing a Phillips in PZ 2 headed screw but it's not ideal, it certainly won't engage with larger PZ sizes like it would with a Phillips screw.
 

theclaud

Openly Marxist
Location
Swansea
No they aren't.

A Phillips only has the four blades but the big difference is the following.

No matter what size phillips screwdriver you use the thickness of the blades and the angle/taper of them remains the same from tip to shoulder of the head, this means that any larger phillips will still engage at the tip with a smaller phillips screw size.

Pozi drive they actualy scale up all the dimensions of the tip as you go up through the sizes, the blades are thicker and the tip is blunter and wider.

You can if you have to get away with stuffing a Phillips in PZ 2 headed screw but it's not ideal, it certainly won'T engage with larger PZ sizes like it would with a Phillips screw.

I found this quite interesting. Should I be worried?
 

Zoiders

New Member
The exception of course is the very small Phillips screws you find on some glasses and on the back of computer mounts like the Sigma uses which need that needle sharp tip of the very smallest sizes, thats obvious looking at them though.
 
OP
OP
mickle

mickle

innit
Soooo.......which one to open a tin of paint?

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