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Pozi bits

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jlaird

jlaird

Great Pumpkin
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Do these only come in three sizes and where would I get a set?
 
Oh, my favorate tool store Sears. Cool, thanks.
 
there are 4 sizes of Pozidriv....0 - 3.

HOWEVER......as you are working on a British car they never have used Pozidrive screws. A Posi screw has a Phillips type head drive arrangement but the ramp angle of the 4 blades are diferent. The screws have an identifier for Pozi that has a strike mark between each blade recess on the top face of the screw. Pozidrive screws are used mostly in industrial an airframe applications.

What you are probably looking for is Reed and Prince also known as Frearson bits. They have yet agin a different ramp angle and have the similar to Phillips drive. Try 52785A25 at McMaster-Carr.
 
Hi Jerry,
At least some (if not all) Austin Healeys had Posidrive screws hiding, waiting for the unaware to strip them
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. The door hinges on my car have posi. There are other places, but I can't remember them at the moment.

Cheers,
Greg
 
Door hinges and door latch striker for sure are Ponzi and identified as such. A few more around but not sure where and of no big import.
 
Jerry - MG's also had Pozi's - lots of places...& they're marked as such once you scrape the paint off.
 
Tony:

Well coming from you I believe you.

I would say thats highly unusual ...the use of Pozi's. But they are positively marked on the screw head and there is no mistaking them.

About 3 months ago..someone on another board wanted a few sizes of Pozi "for my MGB"...and I figued he was retrofitting. I sent him about 3 of the sizes he wanted in Pozi...he got them and said "these are not Pozi"

I am still a bit confused...but if you say the head markings are correct I believe you....it's hard to believe that an OEM in the UK was using Pozi in anything.
 
Jensen Healeys are Pozi too.

Snap On, Stahlwille and Proto have nice ratchet drive Pozi bits. So does FACOM but you can’t get them through US suppliers.


PC.

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Oh, and there are five Pozidriv sizes. #4 isn’t very common but they’re out there.

I presume the reason Wiha doesn’t sell them is because their primary focus is the electronic/electric/electromechanical market rather than mechanical. Pozi is very common in European automation, power, switchgear, and relay equipment.
 
I've got 0-4 in 1/4", 5/16", & 3/8" drives
 
Tony, where did you get them??
 
British Tools - he used to have a banner here...don't know what happened to it...had to remove a door today (had never been opeaned or removed before)....#3 posi in an impact hammer, couple of whacks & they camr right off
 
I am surprised that nobody pointed out the reason or purpose of Philips (which I had never heard of in England before I moved to the US in 1976) versus Pozidrive.

The profile of Philips has a slope so if you are using a motorized screwdriver to do up the screw, when it gets tight the screwdriver bit jumps out of the screw rather than stalling the motor; in other words, it is beneficial for rapid assembly but a disadvantage from then on.

Pozidrive has a vertical profile so there is no tendency for the bit to ride up out of the screw. You don't have to push and hold the bit in place, either doing up or undoing a screw. It follows incidentally that when you are installing a Pozi screw in an inaccessible place, you can put the screw on the bit and with luck it won't fall off. With Philips it always falls off!

My old Rover has neither, of course!

Ken G, 1925 Rover 16/50 (San Francisco)
 
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