 | Home > Maintenance & Modifications > Stainless bolts for roll cage |
 
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| Co1 Member Since: 19 Aug 2018 Location: North Yorkshire Posts: 3611   
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Can’t see why they wouldn’t be OK, assuming you get the right strength bolts. People get the knickers in a twist because you can’t get SS in the higher strength grades, but I don’t imagine the ones that come with the roll cage are high tensile?
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4th Jun 2023 8:43am |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 790  
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There is some truly crap stainless out there, but if you go for more reputable suppliers (marine grade) and you take A4 quality it should be the same as 8.8 normal rating.
Stainless bolts can fret (jam up) use an anti seize or use normal nut (assuming the nut will not be visible and this some surface discolouration is not normally visible). |
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4th Jun 2023 9:19am |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2196 
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The grade of stainless: A2 or A4 (304 or 316) is largely irrelevant to the strength. The second part of the code is more important: 70 or 80. In theory an A4-80 bolt is comparable in strength to an gr8.8 but they are more brittle.
If your 'roll cage' is a proper setup then i wouldnt personally use anything but gr8.8 (or even gr10.9) bolts. If it is just a semi-cosmetic addition then A4-80 would be okay. Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale Mobile Diesel Heater Build Thread |
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4th Jun 2023 10:07am |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2065 
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Use the right bolts. That cage could save your life one day. I used stainless washers and nut caps. Kept it looking tidy.
 Click image to enlarge Instagram @defender_ventures Empire Tuning - Agent |
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4th Jun 2023 10:11am |
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| Screbble Member Since: 26 Apr 2015 Location: Lancashire Posts: 2024 
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Whilst I always wince and flinch when I see that picture - I think it’s important to be reminded of the fact that our trucks are incredibly vulnerable.
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4th Jun 2023 10:14am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16858 
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You are joking, right? The cage will come with a minimum of grade 8.8, which is HT. |
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4th Jun 2023 12:02pm |
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| bodstruck Member Since: 09 May 2020 Location: Wiltshire Posts: 774
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Thanks for the input. I think I'll stick with the supplied bolts and change the washers to stainless. I have some M10 washers already so I'll get that done before i mount the RTT and lose access.
Cheers  |
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4th Jun 2023 12:51pm |
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| Mossberg Member Since: 29 Feb 2020 Location: Lancs Posts: 552 
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Just look at the head of your bolt and see what type they are. I would be shocked if they were less than 8.8.
Remember things are only as strong as the weakest link. Your bolts may have been BZP so an alternative could be galvanised? |
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4th Jun 2023 12:54pm |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 790
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Safety is a game of managing risks and probability (luck).
These bolts can, but most likely will not be instrumental in saving your life. There are many many other factors at play, many you can control. We like to focus on equipment but the main cause of accidents is human, what we do and how we behave. A safe car or a roll cage is just going to increase your chances AFTER you f&cked up (which started with you stepping into the car). - Is the journey really necessary?.. at that time, at night, when slippery, unsafe road? - Are you using defensive driving techniques? Correct speed for conditions and car(!) keeping distance etc. - Are you focused on the task: distractions, hurried, tired, had a drink maybe? - Are you fully aware of your surroundings, are you being seen by others - Do you understand the limitations of the car you drive (not as if fast cars are safe, but still) Defenders are incredibly vulnerable and I really see it as a 'second car'. There are moments where it's best left in the garage. And yes I agree stainless A4-80, not just A4. I also think that pretty much any steel bolt you buy will be 8.8 which is High Tensile, 4.8 comes with Chinese cr&p, you are not going to save anything, they are almost hard to find.[/list] |
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4th Jun 2023 1:20pm |
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| bodstruck Member Since: 09 May 2020 Location: Wiltshire Posts: 774
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They are 8.8.
Just seems a little odd that you spend over 2 grand on a roll cage and the fixings look like this after a mere 6 months. Click image to enlarge Not the end of the world as they will still do their job but still seems a bit poo 
Anyhow, stainless washers it is for now. I'll clean the nuts and bolt heads up a little before I refit the covers. |
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4th Jun 2023 9:13pm |
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| Mossberg Member Since: 29 Feb 2020 Location: Lancs Posts: 552
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Could you just change the existing bolts. Get them from a fixings company rather than screwfix etc. When you fit the new bolts, after fitting, give them a wipe with acf50 etc They should last for years then.
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4th Jun 2023 9:53pm |
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| 100inch Member Since: 15 May 2012 Location: Brunswick Posts: 407  
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If you like to read into why stainless fasteners are a no go, read about its ductile behavior, stress strain curves. M
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4th Jun 2023 10:41pm |
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| kenzle8a Member Since: 12 Feb 2020 Location: None Posts: 1074 
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Decent bzp 8.8s sold last a while, i had new ones on my tow hitch that still looked as new after a Scottish winter
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4th Jun 2023 11:49pm |
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| Screbble Member Since: 26 Apr 2015 Location: Lancashire Posts: 2024
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I was also thinking new bzp 8.8 with a liberal coating of ACF50 and some plastic dome caps on both bolt head and nut.
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5th Jun 2023 6:51am |
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