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Old 02-12-2015, 07:15 PM   #1
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Exhaust bolt replacement ...Stainless or ?

I have one of my secondary cat bypass pipes off right now, the bolts while still quite functional are ugly from the heat of 15 years and 70K miles....I have a great supplier locally who has everything from Stainless to Grade 8 and up in bolts. What would you guys use to replace yours ? and if stainless would you use anti seize to help the next time they are removed ??

Thanks in advance

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Old 02-13-2015, 04:45 AM   #2
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I have one of my secondary cat bypass pipes off right now, the bolts while still quite functional are ugly from the heat of 15 years and 70K miles....I have a great supplier locally who has everything from Stainless to Grade 8 and up in bolts. What would you guys use to replace yours ? and if stainless would you use anti seize to help the next time they are removed ??

Thanks in advance

Dwight
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Old 02-13-2015, 09:17 AM   #3
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Wow M8 x 1.25 carriage bolts are hard to come by
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Old 02-13-2015, 12:30 PM   #4
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Use stainless everything.Bolt nut washers and lock washers.
Grade 8 is the wrong application.
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Old 02-13-2015, 03:00 PM   #5
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I am

I already sourced them at Mr. Metric , I know Grade 8 is carbon
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Old 01-26-2017, 01:05 PM   #6
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Wow M8 x 1.25 carriage bolts are hard to come by
So you're saying I'm not likely to find them at Home Depot tomorrow after work. I was hoping to have these pipes buttoned up tomorrow night
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Old 01-26-2017, 02:44 PM   #7
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Carriage bolt ? Don't you mean hex head ? Carriage bolt is for wood .
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Old 01-26-2017, 02:58 PM   #8
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carriage bolts

Part of the exhaust hardware are some bolts that look like carriage bolts. Pan head with no slots and a shallow self locking square just above the threads and below the head.

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Old 01-26-2017, 03:04 PM   #9
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Nope, carriage bolts are used in the exhaust clamps for the secondary cats/by-pass pipes to U-pipe connection. Metric carriage bolts...
Might be replaced with regular stainless bolts tomorrow afternoon...

Edit
Pdwight got it in first...

Last edited by WillH; 01-26-2017 at 03:06 PM.
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Old 01-26-2017, 03:19 PM   #10
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Metric carriage bolts are available in stainless steel, even Amazon sells them.
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Old 01-26-2017, 04:52 PM   #11
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Regular SS hardware for home dope or local hardware will work just fine.
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Old 01-26-2017, 08:12 PM   #12
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Yes it would

Actually anything that would pull the clamps in would be OK......that being said Mr Metric is a wonderful resource for hard to find fasteners (I have no involvement whatsoever with them)
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Old 01-27-2017, 01:06 PM   #13
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So no love at mr metric. McMaster Carr same. Fastenal has them but want 50 some odd bucks cdn. for a box of ten.
I'll be using regular bright bolts and not worrying about it. They will probably only be on for a year or so before the muffler gets changed out for a magnaflow and the the u-pipes go into the garage attic with the rest of the stock stuff.
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Old 01-27-2017, 07:00 PM   #14
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Try Here

m8-1.25 STAINLESS STEEL METRIC CARRIAGE BOLT
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Old 01-27-2017, 07:40 PM   #15
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Stainless studs for the headers may also be of interest?
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Old 01-27-2017, 08:48 PM   #16
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Size

Do you know off the top of your head (what a funny way to put that) what size they are ?
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Old 01-28-2017, 08:49 AM   #17
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It may be easier to 'cheat' and use a 5/16" bolt.Choose your length carefully.Nordlock washers also?
https://www.boltdepot.com/Carriage_bolts_Stainless_steel_18-8_5_16-18.aspx
http://www.ebay.com/itm/Stainless-Steel-Carriage-Bolt-25-5-16-18-x-1-1-2-/201736255999?hash=item2ef86af9ff:g:6nIAAOSw-0xYQZ2H

Last edited by Gelbster; 01-28-2017 at 08:52 AM.
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