 | Home > Maintenance & Modifications > Rustproof, high-tensile bolt options? |
 
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) that will stay shiny silver? Its such a small number of bolts that I could justify spending a disproportionate amount on speciality ones.
| SJM2018 Member Since: 06 Jul 2018 Location: Bristol Posts: 296   
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I thought about this recently; could you cold blue them?
I know bluing doesn't offer much protection, but with a regular squirt of ACF-50 / Bilt Hammer Atom Mac too, they might last longer before turning orange. 2011 CSW XS 90 |
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10th Mar 2022 4:20pm |
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| NormanD Member Since: 12 Aug 2011 Location: Bristol Posts: 286  
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Why not use Zinc Plated and Passivated Socket Head Bolts (Grade 12.9) available from most Fastener Suppliers. Relatively cheap and if they corrode just replace them NormanD WE191
2015 110 XS Utility 2014 VW Caravelle 180 Executive |
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10th Mar 2022 4:46pm |
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| Screbble Member Since: 26 Apr 2015 Location: Lancashire Posts: 2106 
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A4-80 Stainless Steel is roughly the equivalent to high tensile steel.
Have a look at https://yrmit.co.uk/ It’s like a sweet shop to me… Beware of galling though  |
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10th Mar 2022 5:28pm |
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| Co1 Member Since: 19 Aug 2018 Location: North Yorkshire Posts: 3678 
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What scrabble said, A4 stainless.
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10th Mar 2022 6:20pm |
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| Gasket Member Since: 30 May 2020 Location: Manchester Posts: 629 |
wow!!
I had no idea that i would be that simple. Thank you. Its easy when you know what to search for: Googling A4 stainless shows a page from Spalding Fasteners with this handy set of bullet points: Which Material? We stock fasteners in a variety of materials, including the following: A2 Grade Stainless Steel - This is resistant to rust but is not strong nor resistant to salt water. A4 Grade Stainless Steel - This is resistant to rust in marine conditions and is stronger than A2. It is equal strength to 8.8 Grade Steel. Mild Steel - This is not a strong material and is mainly used for nuts and washers. We stock this in zinc plated. High Tensile 8.8 Grade Steel - This is steel that is classified as High Tensile (8.8 Grade is the lowest grade of high tensile available) We stock some items zinc plated and others in self colour (no plating). High Tensile 10.9 Grade Steel - This is a stronger grade of High Tensile Steel. High Tensile 12.9 Grade Steel - This is a stronger still grade of High Tensile Steel. |
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10th Mar 2022 6:47pm |
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| Pacha Member Since: 23 Feb 2020 Location: North Yorkshire Posts: 772 
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Yep, this. Rgds. Chris |
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10th Mar 2022 7:52pm |
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| db950 Member Since: 01 Feb 2012 Location: Lincoln Posts: 560 
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Personally I wouldn’t use stainless bolts of any grade on a recovery point or any high stress fixing.
For a recovery point a 10.9 tensile bolt would be better. FYI, Land Rover extensively use Geomet 500 coated flange headed bolts and resist corrosion quite well. 1997 Ex-MOD 110, Pop Top Camper, build thread https://www.defender2.net/forum/topic72352.html 2014 Discovery 4 SE Tech Instagram @the110camper |
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10th Mar 2022 9:16pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3421  
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Keep in mind that the A4-70 is a bit more common than A4-80.
The 70 and 80 stand for the tensile strength, i.e. 700 and 800N/mm^2 respectively. So the A4-80 are almost as strong as a grade 8.8 steel bolt, but not as strong. If you want to have same strength as a 10.9 equivalent, but still in grade A4-80, then can consider over sizing the bolt, by replacing M10 with M12 if that is possible. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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10th Mar 2022 10:36pm |
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