Which rivet material?
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=13817
Printed Date: 13 Aug 25 at 2:23am
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Topic: Which rivet material?
Posted By: L123456
Subject: Which rivet material?
Date Posted: 09 Aug 21 at 11:51am
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What pop rivets do I need to attach stainless steel fittings to aluminium masts? Do I need monel rivets?
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Replies:
Posted By: Andymac
Date Posted: 09 Aug 21 at 12:21pm
| Depends really. If it is fitting with a high stress load such as shroud attachments, kicker tang etc then Nomel is a must. If it is a low stress fitting ie burgee holder then alloy would be adequate. If in doubt then default to Nomel. NB some plastic fittings could break before the mandrel of a nomel rivet such as HA 262 fairlead used as Laser/ILCA! Outhaul fairlead on boom. |
Posted By: L123456
Date Posted: 09 Aug 21 at 12:33pm
Nomel? Is that a typo or is that different to monel? Monel is Nickel Copper Alloy
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Posted By: Sussex Lad
Date Posted: 09 Aug 21 at 1:25pm
Just as a suggestion I use Duralac liberally smeared between the surfaces before riveting. It inhibits electrolysis.
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Posted By: maxibuddah
Date Posted: 09 Aug 21 at 2:21pm
between stainless and aluminium it is necessary to use a prevention compound like you suggest. These two are far apart on the galvanic table - http://www.qsl.net/n9zia/electrochemical.html" rel="nofollow - https://www.qsl.net/n9zia/electrochemical.html and there will be issues with the ali being corroded if you don't. ------------- Everything I say is my opinion, honest |
Posted By: L123456
Date Posted: 09 Aug 21 at 2:48pm
Duralac is a must. |
Posted By: Oatsandbeans
Date Posted: 09 Aug 21 at 5:09pm
| Duralac -full of CrVI -not flavour of the month environmentally , everyone is getting rid of it! |
Posted By: 423zero
Date Posted: 09 Aug 21 at 5:56pm
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https://www.marshfasteners.com/can-stainless-steel-and-aluminum-be-used-together/
------------- Robert |
Posted By: 2547
Date Posted: 09 Aug 21 at 6:43pm
I believe it’s banned in the US. TechGel is the now preferred but it doesn’t set and so is less effective.
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Posted By: Andymac
Date Posted: 09 Aug 21 at 7:33pm
| Doh! Nomel = Monel. Typo x 2! Thanks |
Posted By: Sussex Lad
Date Posted: 10 Aug 21 at 7:39am
....and replacing it with stuff that doesn't work  Nitromors and Creasote went the same way. All for the greater good I suppose.
To be fair Chromate has been known as a carcinogen for years. Wear Gloves.
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Posted By: mole
Date Posted: 14 Aug 21 at 12:46pm
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The best rivets for high load fittings are monobolt rivets. The important parameter is the sheer strength of the rivet. Monel rivets are good allrounders on smaller rigs/boats. Most important is the preparation of the hole. Use good quality of drill bits, deburr the holes (you can get a special tool for inside the hole) Make sure the fitting fits snug to its mating surface, any gap will significantly reduce the strength. Fettle or form it if required. Make sure any necessary alignment is considered. Particularly spreader brackets with the mast heel. Obviously make sure the rivet is the correct length,- grip range Use a good quality riveting tool with the correct nozzle The jointing compound has been covered, and most masts are 7000 series alloy which has good corrosion resistance (relatively), but if you have any other alloy it may require a different type of insulating material/compound. |