What Nuts (Metal Type) To Use In Exhaust?

[ausdrift]

Im thinking of getting new exhaust parts and wanna replace the nuts I will be undoing. What kind of metal should the nuts be made of to best survive the high heat?

informed answers are much appreciated, thanks

[PaulosECR33]

Im thinking of getting new exhaust parts and wanna replace the nuts I will be undoing. What kind of metal should the nuts be made of to best survive the high heat?

informed answers are much appreciated, thanks

get high tensile nuts, you may as well replace the studs too, when ever i change them i use oem studs as although high tensile is stronger, if they snap, its much easier to get mild steel studs out (drilling and extracting).

BTW the oem ones are ok, they just weaken over the years from heat and elements etc.

[zebra]

I dont think he is replacing the manifold studs.

BTW use stainless, under the cars is exposed to the weather/heat etc, so mild steel will rust and then be a pain to get off

[PaulosECR33]

my bad i thought manifold , in that case if its under the car then i would also use stainless.

[ausdrift]

thanks

[zebra]

Also use Ny-lock nuts so they dont come loose.

[kristafa]

just 2c

from my experience nyloc's will melt on exhaust components, you'll want a crushed nut they will provide the force to stay on due to a slightly elongated thread tip

[Sunkist]

nylocs are no good, plus 1 to the above, crushed styled nuts are the go.

[Adriano]

Titanium Crush nuts are the business on an exhaust, never have trouble undoing them.

[tridentt150v]

I'm not too keen on stainless and heat, they expand a lot more than high tensile, this allows the gasket/sealant to walk or loosen. but saying that you can get s/s that doesn't expand as much, but its not as common.

I'd go high tensile bolts and crush nuts or split nuts

[Messiah]

on this note, does anyone want to share a good place to source this stuff from.

I just replaced my exhaust and found the last exhaust guy welded the cat on.

So i buy a new cat and go ti fix it only to find that because he welded one join... i'm one set of nuts short (or so to speak).

A trip to bunnings did the job, but i dont know if i want to rely on these long term.

[Sunkist]

bunnings is good for this stuff.

i bought a set of copper nuts for the turbo dump with the crush styled lock.

been a month or so, no where near coming off - although they are designed for dump pipes so i guess they are designed to take the heat. gottem off ebay.

[Trozzle]

Won't the nylon in the thread just melt Andrew?

[zebra]

I wouldnt recommend using Nylocks on dump pipes / turbos etc, but for the rear section / things that arent going to 600deg temps lol...use high temp locktite for that stuff.

[karma_syke]

i dunno about you but i don't think these nuts would stand up to exhaust temps, unless you like your nuts roasted, mmn....

[zebra]

Useless trolls belong in the wasteland

[GT-RZ]

realistically mixing disimilar metals is not the go.

if your dump and exhaust is stainless then feel free to use SS. If it's mild steel then steel fasteners naturally are choice... One word of warning though if your going to replace studs/bolts and nuts with SS items you must apply some lube/anti galling paste, it's good practice to do this with steel too but steel wont cold weld itself together like SS will. If you dont it's almost guaranteed you will sheer the stud/bolt when you try to remove the nut in the future if you tightened it up correctly.

my 2c. don't overcomplicate things.