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Old 3rd October 2019, 17:48   #11
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Originally Posted by kaiser View Post
Perfectly fine to use. That part will never see any strain. Just impact, unless you drive over the curb and try and reverse
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Originally Posted by suzublu View Post
My sentiments exactly If you hit something that causes the bolts to break, then that would be the least of your worries
My thoughts were as the front and rear crash bars are part of the crash structure to dissipate forces down the chassis, any failure here could lead to an intrusion of the rear, the sides would be able to spread, rather than be retained.

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Old 3rd October 2019, 18:51   #12
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If what's currently on is an 8.8 (and I can't see any reason it would be anything more), then an A4-80 bolt is almost identical strength and a good replacement.


Not looked to see what the crash structure is made from, if it's steel then be careful that you don't shift the rust from the bolts to it...by using stainless into unpainted steel you'll set up a little electrochemical cell (a battery) and the steel will rust.
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Old 3rd October 2019, 18:54   #13
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Perfectly fine to use. That part will never see any strain. Just impact, unless you drive over the curb and try and reverse
Don't over-complicate your lives with worries.
It will be subject to strain if the tow eye has to be used, no need to use stainless in this area as its pretty much protected from the elements.
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Old 3rd October 2019, 19:07   #14
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It will be subject to strain if the tow eye has to be used, no need to use stainless in this area as its pretty much protected from the elements.
I agree, if a little light rust bothers you, then grease them.


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Old 3rd October 2019, 19:28   #15
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I wouldn't call that light rust.

Bolts are 8.8. Beam is galvanised steel (I think).

No part number - https://rimmerbros.com/Item--i-GRID001781 - well, there's a surprise.
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Old 3rd October 2019, 19:47   #16
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I wouldn't call that light rust.

Bolts are 8.8. Beam is galvanised steel (I think).

No part number - https://rimmerbros.com/Item--i-GRID001781 - well, there's a surprise.
It's aluminium, and will act as a sacrificial anode if stainless steel is introduced.

My advice is not to bother, stainless bolts don't have the same tensile strength of the original bolts, and this might not be an issue unless you at any point need to use the towing eye.

Brian
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Old 3rd October 2019, 20:39   #17
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Originally Posted by chris75 View Post
If the heads of the existing bolts are stamped 10.9 , do not replace with stainless . They will not be as strong .
Even if they are 8.8 , many stainless bolts will still not be as strong and as said are more brittle , which is not desirable in impact use .
This.

Stainless is fine in most areas but not as replacements for 10.9 High tensile.

Your bumper beam is fine but be aware stainless does wonders to ally as a disimilar metal
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Old 3rd October 2019, 21:31   #18
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Originally Posted by Blink View Post

I wouldn't call that light rust.

Bolts are 8.8. Beam is galvanised steel (I think).

No part number - https://rimmerbros.com/Item--i-GRID001781 - well, there's a surprise.
I'm not seeing any rust there. The beam is alloy, carefully designed to crush in an accident and be replaceable in a minor shunt..


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Old 4th October 2019, 08:18   #19
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Originally Posted by HarryM1BYT View Post
I'm not seeing any rust there. The beam is alloy, carefully designed to crush in an accident and be replaceable in a minor shunt..

I think he's referring to the rusty bolt heads. I agree with you though Harry, a good cleanup followed by some protection should keep the corrosion at bay.

As most of you know, I like a shiny engine bay. I was looking to replace my suspension top nuts with stainless until the good folks of this forum explained why it may be unwise. Instead, I polished up the originals and gave them a coat or 2 of clearcoat. A few years on and they still look like this:



For an area that's not on show, a coat of grease would be far simpler and just as effective though.

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Old 4th October 2019, 09:39   #20
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Originally Posted by marinabrian View Post
It's aluminium, and will act as a sacrificial anode if stainless steel is introduced.

My advice is not to bother, stainless bolts don't have the same tensile strength of the original bolts, and this might not be an issue unless you at any point need to use the towing eye.

Brian
Thanks for info Brian. I hadn't realised beam was aluminium. I'll whip the bolts out and de-rust them, paint on heads.
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