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Old 29 January 2017, 13:02   #11
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Mark Littler is the chap at Marine fabrications..Queens Drive Industrial Est
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Old 29 January 2017, 15:34   #12
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Originally Posted by jeffstevens763@g View Post
we use stailess bolts a lot in the marine industry and nylon washers prevent the circuit between the two disimler metals bolts tighten up ok best with nylock nuts you can buy plastic sheet materials from direct plastics.
Mmm?

Presumably there is still contact between the two metals, the nylon washer doesn't stop conduction through the bolt??

The only solution I can see to avoid that would be:

Object to bolt down - Nylon washer - oversized hole lined with a non-conductive liner - e.g.plastic tube - Nylone washer - Nut
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Old 29 January 2017, 15:51   #13
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Quote:
Originally Posted by ShinyShoe View Post
Mmm?



Presumably there is still contact between the two metals, the nylon washer doesn't stop conduction through the bolt??



The only solution I can see to avoid that would be:



Object to bolt down - Nylon washer - oversized hole lined with a non-conductive liner - e.g.plastic tube - Nylone washer - Nut


It's called a top hat washer. I still wouldn't be comfortable fitting a stainless a frame to an ally hull. Even with isolating washers there will be corrosion.
https://www.google.co.uk/search?q=to...TuZBEEQgjYI4gI
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Old 30 January 2017, 00:03   #14
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would it work if you fitted an anode would that make any difference
Hi Breezeblock... had a look at Bosuns Locker, they do have a boat like mine but the A frame is the type with the bench incorporated , I need one without the bench, I have e-mailed them with details of what I am looking for so you never know...
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Old 30 January 2017, 00:18   #15
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I'd suspect that's why Highfield won't supply,even the wrong grade ally can cause corrosion issues while in theory you can use insulating materials to keep the two separate in practice it's going to be quite hard to keep the two insulated and fully secure
Maybe someone needs to design a composite one
Highfield will supply one I am told,(500) but they want me to take the boat to them for fitting, a round trip of more than 400 miles, they tell me they can be fiddly to fit, there are 12 drilled and tapped holes in the boat that already have the stainless bolts in them, easy as Pie, when I asked them to send me the frame I was completely ignored, more than once, so I tried other Highfield dealers around the country and was largely ignored or referred back to the main man, Harrison, in Southampton... The boat is good for what I want, but the after sale service is awful in my opinion. I am going to have one made from Ally and have it powder Coated.
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Old 30 January 2017, 01:28   #16
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Highfield will supply one I am told,(500) but they want me to take the boat to them for fitting, a round trip of more than 400 miles, they tell me they can be fiddly to fit, there are 12 drilled and tapped holes in the boat that already have the stainless bolts in them, easy as Pie, when I asked them to send me the frame I was completely ignored, more than once, so I tried other Highfield dealers around the country and was largely ignored or referred back to the main man, Harrison, in Southampton... The boat is good for what I want, but the after sale service is awful in my opinion. I am going to have one made from Ally and have it powder Coated.


Don't waste your money on the powder coating, it won't last especially on ally. Anodising will be cheaper & look better in the long term.
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Old 30 January 2017, 03:41   #17
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dont agree regarding the powder coating this was 6 years in fastened down with stainless screws insulated with sikaflex [ali bases]
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Old 30 January 2017, 05:24   #18
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dont agree regarding the powder coating this was 6 years in fastened down with stainless screws insulated with sikaflex [ali bases]


They don't look to have had much use in 6 years
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Old 30 January 2017, 06:13   #19
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They don't look to have had much use in 6 years
a proper job done dave and looked after as with all my boats
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Old 30 January 2017, 06:15   #20
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a proper job done dave and looked after as with all my boats


Fair play I've just not seen powder coating last very long, on steel, let alone ally. You've only to look at a Delta A frame after a few years & they ain't cheap
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