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Old 03-08-2014, 07:30   #1
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Is this Crevice Corrosion or a Bad Casting?

I was reattaching this cleat, using an impact driver to tighten the bolt. I hadn't tightened it all that much and it shattered.

There is some of that brown stainless discoloration in the area.

I'm wondering if this is some sort of crevice corrosion or if it is a bad casting? Now anytime I see that brown stuff I'm paranoid the piece is going to self destruct. Click image for larger version

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Old 03-08-2014, 07:31   #2
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Re: Is this crevice corrosion or a bad casting?

Asking because there are some used cleats I'd like to buy but they have some of the same staining.


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Old 03-08-2014, 08:06   #3
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Re: Is this crevice corrosion or a bad casting?

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Originally Posted by sully75 View Post
I was reattaching this cleat, using an impact driver to tighten the bolt. I hadn't tightened it all that much and it shattered.

There is some of that brown stainless discoloration in the area.

I'm wondering if this is some sort of crevice corrosion or if it is a bad casting? Now anytime I see that brown stuff I'm paranoid the piece is going to self destruct. Attachment 86027Attachment 86028


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Go with bronze. It doesn't do that. More expensive until you consider over the lifetime of the piece it will likely outlast SS and take far less maintainence.
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Old 03-08-2014, 08:27   #4
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Re: Is this crevice corrosion or a bad casting?

The next time you buy SS parts for the boat, take along a weak magnet. If it pulls on the magnet, move onto the more expensive brand.

The ones you have are probably Seafit/Westmarine and not Attwood.
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Old 03-08-2014, 08:44   #5
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Re: Is this crevice corrosion or a bad casting?

It looks like dissimilar (galvanic) metal corrosion based on the pitting in the countersink. It also looks like a very lightweight, Chinese crap-stainless part.

Definitely the bargain brand.
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Old 03-08-2014, 10:12   #6
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Re: Is this crevice corrosion or a bad casting?

good that you found it was defective before it failed and your boat got smashed against a dock.
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Old 03-08-2014, 10:13   #7
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Re: Is this crevice corrosion or a bad casting?

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...It also looks like a very lightweight, Chinese crap-stainless part.

Definitely the bargain brand.
This.
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Old 03-08-2014, 10:33   #8
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Re: Is this crevice corrosion or a bad casting?

Counter sunk bolts where there is marginal support to sides is also very bad practice. I cringe when I see that, particularly on cast fittings. A wedge, flexing the weakest point, every time it is loaded. When fabricating parts that is something I strenuously avoid. Had it been designed for Flathead bolts the story might be different.
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Old 03-08-2014, 10:33   #9
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Re: Is this crevice corrosion or a bad casting?

it could be IGA, those cleats are cast and don't have a lot of meat around the bolt, so it could be it had a micro crack before you tightened it and not IGA too. Simple cast material can be a bit crack prone in tension. I like chromed bronze or bronze in those herreschoff type cleats... but have used the cast 316 ss before too. I doubt cast SS will react to a magnet..?
I like those style cleats but most manufacturers (US or orient) seem to leave little meat around the bolt hole. I'd like to see at least 2 x the hole diameter all around the hole. No one makes that that I know of.
So you are stuck with a cleat that has two bolts going thru it, or this type with 4 bolts and little edge margin...
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Old 03-08-2014, 10:40   #10
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Re: Is this crevice corrosion or a bad casting?

Oh man...

Sully... I wouldn't use that style for anything... Possibly a pennant halyard, but only if it looked like obtaining a proper cleat was years away... Extremely poor mounting configuration...
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Old 03-08-2014, 10:43   #11
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Re: Is this crevice corrosion or a bad casting?

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The next time you buy SS parts for the boat, take along a weak magnet. If it pulls on the magnet, move onto the more expensive brand.

The ones you have are probably Seafit/Westmarine and not Attwood.
Hey Del, In my mind most Atwood stuff is cheap pot metal hardware. That aside.. Do they actually make these Herreschoff cleats in the USA? I would seriously doubt that ....but it would be good to know if anyone knows!
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Old 03-08-2014, 11:02   #12
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Re: Is this crevice corrosion or a bad casting?

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Originally Posted by Ex-Calif View Post
It also looks like a very lightweight, Chinese crap-stainless part.

Definitely the bargain brand.
This.
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Old 03-08-2014, 11:35   #13
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Re: Is this Crevice Corrosion or a Bad Casting?

So how come there is no strength rating system for cleats? I've never seen test results. We worry about how strong the line is and have so little info on the cleat.
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Old 03-08-2014, 11:46   #14
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Re: Is this Crevice Corrosion or a Bad Casting?

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So how come there is no strength rating system for cleats? I've never seen test results. We worry about how strong the line is and have so little info on the cleat.
Yeah, I was thinking this same thing when this came up. Some load testing would be interesting... better have a steel deck boat though!
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Old 03-08-2014, 13:21   #15
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Re: Is this Crevice Corrosion or a Bad Casting?

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So how come there is no strength rating system for cleats? I've never seen test results. We worry about how strong the line is and have so little info on the cleat.
I generally worry more about the deck than I do the cleats. I have seen many boats with just washers on the back of 12" cleats.
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