What size nut for O2 sensor?

[Andy325i]

. . . and where can I get one

The O2 sensor is a Bosch unit from a 1995 530i (V8)

Many thanks

Andy

[DaveD]

I didn't think O2 sensors had nuts?

[Brianmoooore]

M18 X 1.5.
Bit of an unusual size, but my local fasteners supplier stocks them.

[Andy325i]

Thanx Brian!

Have tried:

Brenmark
Southwest fasterners
Woodbury Chilcott

both no joy

Kebrell have M18x1.5 in nylock or lock nuts which are apparently the same but half the height, so the guy suggested welding 2 together?

What is your supplier Brian?

Many thanks

Andy

[appletree]

is there any machining companys near you i got a bit of hex bar tapped out for a £5 and it was shaped to the exhaust

[Andy325i]

Thanx Appletree, will have a word with my machining guy but not sure that they will have a tap that size, as it seems a bit rare


Andy

[ian332isport]

Andy,

If you can't find a suitable nut (or someone to make you one), you can get something designed for the job from Demon Theives and the like (Merlin Motorsport, GPR etc).

Cheers,

Ian.

[Brianmoooore]

My supplier is: John Taylor Fasteners, Unit 5, Gratton Way, Barnstaple, EX31 3NL (01271 373212), and, when I asked a couple of years ago, when the same question was asked of me on an LPG group, they said they would be willing to supply by mail order.
A fairly thin nut is all you need, so you should be able to get what you want out of a nylock, and shape it to fit the down pipe.

[daimlerman]

On my hottuning exhaust manifold there was a tapped hole that I asume is for an 02 sensor.It is the same thread/size as a 14mm spark plug...I got a blanking plug from my local Partco for a couple of quid,it was a Walker part.

[Brianmoooore]

On my hottuning exhaust manifold there was a tapped hole that I asume is for an 02 sensor.It is the same thread/size as a 14mm spark plug...

M18 X 1.5 is spark plug size. I use a spark plug thread 'chaser' to clean out O2 sensor bosses as well as plug holes.

[DanThe]

Got one here you can have Andy, its been cut out of an old 525i exhaust

[Andy325i]

Thanx guys, much appreciated

Where is the best place to locate the O2 sensor?

Andy

[glenn]

i have three spare one's here andy, off the m5 exhaust.
also got the m5 exhaust gas temp sensor.
i've also got a few bit's of exhaust here, with the bosses.
let me know if you need any of it andy

[Jon_Bmw]

Any place that custom makes exhausts will have one*, and they will probably give you one for nothing if you suggest you are probably going to come to them for a custom exhaust


*For example maniflow in salisbury.

[Andy325i]

Thanx guys, much appreciated too Glenn, will bear that in mind for the near future. I had to get a few bolts for the rear box today, so got a couple while I was there. Great guy and loves the E30's more than "the newer BMW's" and was well impressed when I told him what I had done. He also has an R32 Skyline as a play toy



I was worried that the "half height" nuts wouldn't have much thread, but there is more than enough there I think

Thanx again guys


Andy