What is the working load of that ring?
The ring is a certified 2500kg ring. The D shackle is also certified. No wiggle room for an insurance claim… And we are the ones that have to sleep at night on anchor.
It’s 10mm chain. The chain is weaker than the ring. Some anchorages we use are very shallow. If the snubber bounces off the bottom, most connections come undone. This won’t.
I’ve had a ring like that, used in a dinghy lifting harness, break at the weld. Monitor it regularly.
A dinghy only weighs a few hundred kg at most. If a ring broke while lifting a dinghy, I’d be extremely concerned about the supplier of the rest of your rigging. For a ring to fail with a load of only 150kg, there must be an explanation. I would be replacing any rigging I got from the same supplier.
I would seriously dispute that a certified 2500kg ring would break lifting a 150kg dinghy. Perhaps you didn’t have a ring like that.
Perhaps you can compare the thickness of the ring to the thickness of the anchor chain.
There’s a huge difference between a ring’s working load, and the shock stresses that constant loading and unloading place on a weld. And, since this ring will be submerged, it will be subject to pitting corrosion. If it’s going to break somewhere, it will probably be at the weld.
My only suggestion is that you monitor it on a regular basis. One needs to learn from others’ experiences, because if it happened one time, it will probably happen again.
May I also suggest checking out the relatively new Mantus M3 chainhook: M3 Chain Hook - Mantus Marine
Perhaps one does need to learn from others experiences. I thought that is what you set this forum up for.
So why are you trolling your own forum?
This isn’t my forum. I simply do the technical/administrative stuff to keep it running, and pay to host it. I consider myself to be a user, just like everyone else.
You seem to think that the failure of my ring was due to poor quality. I think that it was due to pit corrosion and constant stressing, which resulted in the weld failing. My ring was never submerged, but regularly sat on the dinghy floor, where it was exposed to saltwater. The bottom line is that I failed to inspect it on a regular basis, and it failed. Luckily, nothing bad happened as a result.
You have a ring that is regularly submerged (and thus prone to pit corrosion) and subject to much higher loads, and a failure could be catastrophic.
I consider trolling to be people trying to pick fights for the purpose of stirring the pot. I fail to see how us discussing failure modes of stainless steel rings is trolling! I read forums on a constant basis to learn from other people’s mistakes, and hopefully not repeat them.
My whole point is to regularly inspect that ring, along with the rest of your ground tackle! I’m sorry if you feel that I’m trolling you. That was not my intention.
Hi Mike
First off that 60 knots in an anchorage is sure not fun! We had a hectic time (fortunately at 11h00) two weeks ago in Montenegro where we had winds over 70 knots (I am not trying to start a pissing contest!! 
) and this sure was compounded by poor holding in mud (which we knew about) I had to wear my scuba goggles to read my instruments !! ……. Short story, we managed via motoring to keep the situation under control and fortunately the situation only lasted just under an hour.
My two cents on your set up ……. I would offer a word of caution on the shackle method you are using unless you mouse it someway. As the loading and moving of the bridle could loosen your shackle pin. I learnt this from a good friend a few years ago in the Caribbean who moused his anchor shackle with a cable tie (no comment and he had a doctorate in chemical engineering!! 
) well he went for a dinghy ride to go and hike a small mountain and got to a good vantage point to take a photo of his yacht and it was no longer in the anchorage ! .. The short version was the movement of the chain had undone the shackle pin of his anchor shackle. The good news is someone rescued his yacht and tied it to theirs before it disapeared over the horizon and this is (as I am sure you know) why the bolts of shackles need to be moused or locked with monel seizing wire. on most application on a yacht
I use the second generation Mantus chain hook with a modification that I made by replacing the rubber strap that secures the hook onto the chain with a nylon webbing strapping and velcro (there is no load on the strap) Mantus now have a third generation chain hook that clamps onto the chain (check out their website) and they recommend replacing the locking pin spring every two years (yes I realise this is to give them protection from the litigious nature of American clients who will sue you for anything ) So given that I also think Geoff has a point about internal pitting on welds on stainless (there is a very interesting interview on the You Tube channel Fair Isle on stainless and corrosion and water temperatures etc. definitely worth a peek. This is from at least four years ago) I have a VERY high regard for your skill, knowledge and practical nous on this forum. That said, I sure hope that ring is from a reputable source like Wichard, Harken, Tylaska etc otherwise I do not think the load rating is not worth the paper it is written on and probably comes from China where anything goes.
Cheers ………. Steve
