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Old 19-05-2011, 14:42   #286
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Re: Rocna Size

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Originally Posted by Dockhead View Post
Not all of them -- all of the Chinese Rocna wihth cast flukes. The "Genuine Rocna" letters are cast, not stamped.

My 55kg Chinese Rocna has a brake-pressed plate fluke, not a cast one, so lacks the letters even though it was made in China. I'm itching to get to the boat with a hammer and center punch to see what the shank if made of.
I will place a wager on dimples
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Old 19-05-2011, 14:49   #287
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I will place a wager on dimples
I think they're dead sexy.....
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Old 19-05-2011, 16:27   #288
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Re: Rocna Size

expert help required...I have been offered this 75 kg anchor, the label states "NZ marine, Made in China. it is not pressed into the shank, it is just a glued on label.

Please identify if this anchor is one of the "not up to specifications" anchors.
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Old 19-05-2011, 16:58   #289
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Re: Rocna Size

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expert help required...I have been offered this 75 kg anchor, the label states "NZ marine, Made in China. it is not pressed into the shank, it is just a glued on label.

Please identify if this anchor is one of the "not up to specifications" anchors.
Based on discussion in this thread, the Rocna anchors made in China are of suspect specification due to the steel used in the shank.

The smaller anchors (40kg and less) have a cast fluke with lettering cast into the fluke (identifying the anchor as made in China). The larger anchors have a non-cast fluke.

I would expect that if the anchor your looking at says 'Made in China' on it then you're looking at a China-built anchor - which makes it 'not up to specifications'.

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Old 19-05-2011, 17:02   #290
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Re: Rocna Size

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expert help required...I have been offered this 75 kg anchor, the label states "NZ marine, Made in China. it is not pressed into the shank, it is just a glued on label.

Please identify if this anchor is one of the "not up to specifications" anchors.
Looking at the photo enlarged it looks more to me like an NZ one as the china ones all had a smoother radius to the edges of the shank and in particular the shackle eye edges. The label looks to be a new one placed on what looks to be a used anchor although only guessing at that.
Ask the trader who has it for sale.
What country is it in as that may also help.
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Old 19-05-2011, 17:11   #291
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Re: Rocna Size

Hi Grant,

it's in Florida. It is used...maybe it was traded in because the owner expected it to be below standard..
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Old 19-05-2011, 17:16   #292
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Re: Rocna Size

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Hi Grant,

it's in Florida. It is used...maybe it was traded in because the owner expected it to be below standard..
Do the nail punch test on the shank if he will allow it.

A 70kg needs to be up to spec with the size of vessel you would use it on so if it does not mark with a punch then it would be ok , but if it does then you have to make up your own mind and go with your gut feeling.

Good luck with it.
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Old 19-05-2011, 17:23   #293
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Re: Rocna Size

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I think they're dead sexy.....


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Old 19-05-2011, 17:56   #294
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Those are'nt 'Dimples'... they're extinct Zitts..... aka Pox marks...
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Old 19-05-2011, 18:11   #295
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Re: Rocna Size

The round ones are a nail punch and the straight one was a wood chisel all applied with not a great deal of force
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Old 19-05-2011, 18:27   #296
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Re: Rocna Size

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The round ones are a nail punch and the straight one was a wood chisel all applied with not a great deal of force
You used a wood chisel on an anchor? Where is the firing squad icon when you need it?
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Old 19-05-2011, 18:33   #297
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Re: Rocna Size

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You used a wood chisel on an anchor? Where is the firing squad icon when you need it?
I was thinking much the same! Those things are treated with kids gloves where I come from
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Old 19-05-2011, 18:56   #298
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Re: Rocna Size

regarding punch tests . . . two questions

As background, a few facts:
Hardened tool steel Brinell hardness = 600-1500HB
Bisplate 80 (rocna specification) Brinell hardness = 255HB
Bisplate 60 (general grade apparently used in tested anchors) = 210HB
A36 (mild steel) Brinell hardness = 150HB

So, my two question(s):
(1) would you not get a dimple even in the specified B80 steel if you hit it with a tool steel punch?
(2) would it be possible by eye to distinguish the dimple in B80 steel (speced) from the dimple in B60 steel (apparently used in tested anchors) given their harndess numbers are only 20% different?
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Old 19-05-2011, 19:19   #299
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Re: Rocna Size

Something is just not quite right with this Rocna allegation. So far, it has been very one sided.

I think there is more to this issue.
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Old 19-05-2011, 19:26   #300
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Re: Rocna Size

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Something is just not quite right with this Rocna allegation. So far, it has been very one sided.

I think there is more to this issue.
You would think Rocna would comment, wouldn't you.

They have become strangely silent on this issue.
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