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General => The garage => Topic started by: DazVR6 on 18 February 2009, 20:56

Title: Bolts for exhaust........
Post by: DazVR6 on 18 February 2009, 20:56
Well ive brought a new 6 branch manifold for my vr as my last one cracked and i also brought a replacement decat pipe but with a flexi bit in to stop my new mani cracking, thing is the nice new shiney m10 bolts arnt long enough so i went to Wickes and got some longer ones.

On the packaging though it states that they are to be used in low stress situations......now im thinking that holding part of an exhaust system, especially manfold to cat/decat pipe is quite a stressfull place to be for a bolt with that movement and heat and all   :undecided: or am i wrong, will these bolts do the job..?

If not then wheres the best place to get some decent ones..?  bearing in mind that i need them for friday morning as thats when the car is booked in for it all to be fitted.
Title: Re: Bolts for exhaust........
Post by: Wayne on 18 February 2009, 23:13
From memory exhaust bolts are 10.9 grade, most manifold bolts are 12.6 or 12.8, the bolts in wickes will be 8.8, I would not be happy about using them, best bet look in yellow pages for a hardware suppliers or screwfix and get them from there.
Title: Re: Bolts for exhaust........
Post by: DazVR6 on 18 February 2009, 23:18
Cheers mate...was kinda waiting for you to reply. :wink:
Title: Re: Bolts for exhaust........
Post by: Wayne on 18 February 2009, 23:21
No worries, always feel free to pm if you wish.
Title: Re: Bolts for exhaust........
Post by: Paul86S2 on 18 February 2009, 23:42
If you cant find anyone in yellow pages try E C Pitcher in Walsall Tel: 01922 622523

Not too far away from you.

Paul
Title: Re: Bolts for exhaust........
Post by: DazVR6 on 19 February 2009, 14:22
Phoned Screwfix in solihull and they said they do stainless bolts so gonna go down this evening.
Title: Re: Bolts for exhaust........
Post by: Paul86S2 on 19 February 2009, 17:30
OK, you still need the correct grade though even if you use stainless steel.

Most good exhaust places should stock manifold bolts of the correct grade.

Paul
Title: Re: Bolts for exhaust........
Post by: danny_p on 19 February 2009, 21:17
wouldn't recomend useing stainless,  stainless bolts generally dont like getting that hot,   it also work hardens, and it's slippyer than normal steel so bolts will undo themselves with vibration much easyer.

but the work hardeing is the main issue, they just get harder and harder till vibration cracks them off


Title: Re: Bolts for exhaust........
Post by: rubjonny on 20 February 2009, 08:17
do a search for an ebay seller 'boltmeup' they also have a website www.boltmeup.com
sorted me out with some 10.9 grade M10x90 bolts, which I was struggling to find anywhere!
Title: Re: Bolts for exhaust........
Post by: DazVR6 on 20 February 2009, 15:13
Well i got a bag full from screw fix, think 50 so i'll try these these and see how i go and if any crack or sheer then i'll have plenty of spares... :laugh:

By the way anyone know if tentioned steel is stronger than stainless??
Title: Re: Bolts for exhaust........
Post by: Wayne on 20 February 2009, 15:19
Quote from: DazVR6 on 20 February 2009, 15:13
Well i got a bag full from screw fix, think 50 so i'll try these these and see how i go and if any crack or sheer then i'll have plenty of spares... :laugh:

By the way anyone know if tentioned steel is stronger than stainless??

Yes I think it would be.
Title: Re: Bolts for exhaust........
Post by: danny_p on 20 February 2009, 15:59
high tenstile steel is much stronger