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316 SS shackles on anchors?


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#1 Crazyhorse

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Posted 07 September 2018 - 01:32 PM

Due to the pin on normal shackles catching the bow roller, I went with a galv flathead screw in type but they are Chinese (Burnsco) and of course no stress testing. Whilst its held for a year now, I would prefer something that has a SWL limit for peace of mind. I been told S/S is stronger, more tensile strenght than galv but no idea what weight loading they can take? Unfortunately the only stress certified shackles I can find have a pin that sticks out the side.
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#2 vic008

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Posted 07 September 2018 - 01:43 PM

Can you not hacksaw the protruding bit off. Yachting Monthly found galv slightly stronger and less brittle than SS. Sorry that was chain they spoke of. Galv tested shackles had the highest strength but variable results."ss shackles proved to be consistently stronger than equivalent galv steel ones" So doesn't look like much difference
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#3 vic008

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Posted 07 September 2018 - 01:57 PM

Further; they had a 10mm tested (rated to 0.5 t) galv d shackle bust at 7.35t ---down to an unmarked galv d- shackle 10mm bust at 3.25t.
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#4 Knot Me... maybe

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Posted 07 September 2018 - 03:53 PM

DO NOT assume one metal is stronger than another as it is likely to bite you on the bum. You can get both hell strong steel and  SS as well as both steel and SS that have less structural strength than diarrhoea.

 

Get a Hi-load galv shackle and do what Vic suggests, zizz the end off the pin. Hi-load have over sized pins but are rated and reliable, even the chinese ones which are ALL of them that have a painted pin in any colour except Green. Green Pins cost twice as much as the rest, or should do, but they are made in the land of Daffodils and Windmills, not rickshaws and noodles. But even at twice as much they are still cheap.

 

They have SWL's cast on them. Multiply that load by 6 to get the break load then divide that break load by 4 to get a WLL rated the same way as your change is i.e 4:1 not the hi-load standard 6:1. 

 

In around 6-8 weeks there will be countersunk SS shackles that have reliable ratings in NZ. They are leaving the EU this week.


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#5 twisty

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Posted 07 September 2018 - 03:55 PM

Ask John B about chinese shackles. Once he's finished frothing at the mouth he might give you the lowdown !


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#6 Crazyhorse

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Posted 07 September 2018 - 03:58 PM

In around 6-8 weeks there will be countersunk SS shackles that have reliable ratings in NZ. They are leaving the EU this week.


Great!! Where?
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#7 Knot Me... maybe

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Posted 07 September 2018 - 04:17 PM

Ask John B about chinese shackles. Once he's finished frothing at the mouth he might give you the lowdown !

Most are Chinese now but if whomever orders them knows shackles they can be perfectly OK....if they don't have good knowledge then maybe they won't get a Xmas card from John ;)

 

In saying that we have just started getting some from Japan and the EU. The reliability and quality increase is vastly bigger than the price increase.

 

 

Where do you think Mr C Horse? ;)


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#8 Crazyhorse

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Posted 07 September 2018 - 06:59 PM

Penny dropt...
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#9 Chrisc

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Posted 10 September 2018 - 08:19 AM

 
In around 6-8 weeks there will be countersunk SS shackles that have reliable ratings in NZ. They are leaving the EU this week.


KM, on your anchor line you couldn't mouse a shackle like that, or is there some means whereby you can?
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#10 Crazyhorse

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Posted 10 September 2018 - 08:28 AM

KM, on your anchor line you couldn't mouse a shackle like that, or is there some means whereby you can?


Locktite?
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