Stainless O2 Sensor Boss

[browny]

And I thought this would be easy.

I'm simply after a SS O2 sensor boss. So far everyone i've called has said they can't get them. One guy even went as far as saying using SS would make it difficult to remove the O2 sensor at a later date (?).

Does anyone know where I can get such a thing from?

[MegaGTS4]

If you are going to weld it in I have used stainless nuts in the past and modified them so the O2 sensor was far enough in the gas flow.

Stainless wont be to hard to undo, as long as you let it cool down first, other wise it might lock on and damage the thread or sensor.

MEGA

[browny]

I cant find anyone that has an 18mm nut in stock either.

[\\\Wiktor]

make one. simple you just need a pipe with about 16,5-17mm inside and buy or borrow a thread cutter (don't know the exakt english word) and your there..

Strange that you can't find it thouh...

[browny]

How much is an M18 tap going to cost? At least $20 but I think more like $30-40. No SS supplier is going to sell me a 50mm length of SS pipe so then there is the effort of finding an offcut of the right size stainless pipe(if it exists) and making the thing. Too much effort.

A SS nut should only cost $10 by my catalogue. I cant imagine some sort of proper boss will cost more than $30. Its just finding one in stock thats the problem.

[riceline]

the die cutter that I baught last week cost me $8

[browny]

The last 3/8" BSP tap (~16mm) I bought was $30.

I can't see it being worthwhile to make it myself either cost or time wise.

[Roy]

Is 3/8" BSP the right size...if so as long as you know the right size then you can get a half socket (SS304) from:

- Sandvik Steels

- Prochem

- AE Bakers / Blackwoods

- Austeel

There are plenty fo stainless steel merchants around, just be sure you know what you are asking for and be prepared to pay the minimum invoice value, say $10 or $15, even if the socket itslef is only $4.00.

As for being difficult to remove the O2 sensor at a later date??? unlikely but if too much heat is used when welding (say Mig vs Tig) then the socket can distort/warp making it difficult to do up / undo... id be surprised if this really becamce an issue though.

[MegaGTS4]

Maybe try a plumber or marine shop?, They sometimes have S/S fittings that might be 18mm.

MEGA

[browny]

Roy, The O2 sensors use an M18 thread. The reference to 3/8BSP was to illustrate what larger size taps cost. There are a few SS places up here but from what i've seen of them they pretty much handle tube/pipe and dont have much in the way of fittings. Cant hurt to ask tho....

I will look into marine and plumbing stores as well.