Hi can any one tell me the size of the sump nut..is it m12x1.25 as i want a stronger metal nut..

Difficult to measure unless oil is being drained.

What do you mean by 'stronger'? What is the problem?

These plugs have a tapered thread, so they seal by the thread becoming tight. A parallel replacement will not do, so an alternative will be difficult to find anyway.
They will last the life of the car if not abused. They should not be overtightened, but mostly are, and a good fitting tool should be used when undoing them. New ones are cheap.
Get a standard new one, and a good-fitting tool, rather than trying to modify the design.

Thanks for the replie i lookes on ebay at a fiat one for about a fiver. Their are magnatic one of the same size so was wondering could one of these be fitted instead?. I put my 6 point socket on it but it felt a little big so i changed to a 12 point and still a little loose.I very carefully with a constant pressure loosend the nut and nipped it back up. I took off the socket and the corners of the nut were starting to round.The nut is very soft metal..

I can't say any more about the plug, but I took a note of the sump plug washer size when I last changed the oil on my TA.
16mm outer diameter, 12mm inner diameter.
This might be helpful if you're reusing the plug but want to have a replacement washer ready to hand.

And if you want the benefits of a magnetic plug, you can always put a magnet on the outside of the sump.

I'd stick to the original plug type to avoid the risk of damaging the thread in the sump.

If you are just worried about the depth of the hexagon then just weld a nut to it....... that'll increase the depth and you'll get any socket on it.
Incidentally if the plug "is" tapered then it won't have a washer, if it has a washer then it is a normal parallel thread, neither are interchangeable as the thread pitch is different.

That is the norm in engineering...... not to say Fiat will follow those rules.

murphyv310 said:

....
Incidentally if the plug "is" tapered then it won't have a washer, if it has a washer then it is a normal parallel thread, neither are interchangeable as the thread pitch is different.

That is the norm in engineering...... not to say Fiat will follow those rules.

Click to expand...

My post about tapered thread was under the assumption it was a 1.2 as that is the most popular, and the one most asked about with regard to sump plugs. The OP had not thought to advise which engine.
I then noticed a duplicate post, and lost interest.

Phils panda said:

Hi can any one tell me the size of the sump nut..is it m12x1.25 as i want a stronger metal nut..

Click to expand...

As others have said, it depends upon the engine type.

The engine is the 875cc TA Turbo chain driven unit if this helps.

Phils panda said:

The engine is the 875cc TA Turbo chain driven unit if this helps.

Click to expand...

AFAIK that'll have a bolt with;

a HEX head ,

a"flange" - like a captive washer

and a male thread ( of unknown dimensions)
:idea:maybe see the 500 service GUIDE

this will require a copper sealing washer

Charlie

Phils panda said:

Thanks for the replie i lookes on ebay at a fiat one for about a fiver. Their are magnatic one of the same size so was wondering could one of these be fitted instead?. I put my 6 point socket on it but it felt a little big so i changed to a 12 point and still a little loose.I very carefully with a constant pressure loosend the nut and nipped it back up. I took off the socket and the corners of the nut were starting to round.The nut is very soft metal..

Click to expand...

do any of MickF 's findings tally with yours..

QUOTE from the 500 TA GUIDE;

Here's some addition info:
1. The 17mm drain plug was damned tight on mine, and I needed a breaker bar to undo it. My normal ratchet wasn't long enough, mainly due to the difficulty of getting a good hand on it by being laid down under the car!

2. The filter unit was also damned tight and stiff to unscrew. Your statement of using an 11/16th AF socket was fine but my old Imperial sockets are "double-hex" sockets and the plastic of the filter unit is soft, so I've rounded the peaks off a little. I'll get a "single-hex" 24mm socket for next time.
Oh, and I took out the air filter box to get at it easier.

3. The copper washer on the drain plug you forgot to measure is:
1mm thick
16.5mm outside diameter
12mm inside diameter
I put the old one back on the other way up, but will source a new one (or two or three) new ones from somewhere.

Great stuff, and thank you again for giving me the confidence to do the job.
Regards,
Mick.

This is a pic of the sump nut on the TA 85 turbo.

Hi can i say i used a 24mm socket with a 1/2 knuckle joint then a 8 inch extension bar and then a 1/2 inch rachet. That just for the oil filter ...Man alive.

Not a spin on/off filter then on the TA...... heavens above!!!

No - screw-in plastic cartridge with disposable cardboard (?) filter.