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post #1 of 10 Old 03-18-2009 Thread Starter
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Metric clevis pins

Anyone knows where I might be able to buy metric sized clevis pins? I am looking specifically for 10mm. Retail place would be preferred (custom is always an option but usually pricey).
If you know of any stores selling them online in Europe - that'd work too.
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post #2 of 10 Old 03-18-2009
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I just used google and this came up

Schaefer 98-14 Schaefer Clevis Pin, 3/8\"(10mm) Dia x 25/32\"(20mm) L Ships Store Torresen

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post #3 of 10 Old 03-19-2009 Thread Starter
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Originally Posted by Freesail99 View Post

Thats's the thing - these are not really metric. They are actually 3/8" which is quite close to 10mm but a little smaller. They will "work" but they do not provide as nice a fit as a real metric 10mm would. In particular for the forestay top fitting I'd really like to get a proper size to increase strength and avoid point loading.

I just tried a 3/8" and it is clear that it is smaller than 10mm - by a tiny amount but enough so that it is lose in the fitting and definitely loads just the center. 3/8" is 9.52mm.
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post #4 of 10 Old 03-19-2009
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Originally Posted by brak View Post
Thats's the thing - these are not really metric. They are actually 3/8" which is quite close to 10mm but a little smaller. They will "work" but they do not provide as nice a fit as a real metric 10mm would. In particular for the forestay top fitting I'd really like to get a proper size to increase strength and avoid point loading.

I just tried a 3/8" and it is clear that it is smaller than 10mm - by a tiny amount but enough so that it is lose in the fitting and definitely loads just the center. 3/8" is 9.52mm.
Unless you have a press fit pin (which you wouldn't want in a clevis), you are going to have "point loading".
The shear strength is the cross sectional area of the pin ( Pi X r X r ), doubled for a clevis pins two contact points.
Lessening the diameter of the pin to 3/8" reduces the effective shear strength by 10%. I was surprised that only .019" reduction in diameter reduced the strength by that much...especially since I ran the numbers thinking the change in size would result in less than 5% strength.

Good luck finding the pins you need - I would think they'd be easier to find
outside of the U.S.
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post #5 of 10 Old 03-19-2009
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post #6 of 10 Old 03-19-2009
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DId you try McMaster Carr??

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post #7 of 10 Old 03-19-2009
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I just asked my rigging guy, here is his response; "If you locate metric clevis pins could you also pick up a left handed screwdriver for me?"

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post #8 of 10 Old 03-19-2009 Thread Starter
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Quote:
Originally Posted by Wannafish View Post
Lessening the diameter of the pin to 3/8" reduces the effective shear strength by 10%. I was surprised that only .019" reduction in diameter reduced the strength by that much...especially since I ran the numbers thinking the change in size would result in less than 5% strength.
sounds reasonable. strength is a function of cross-section which is a square function of radius (or diameter), so 5% less diameter is 10% less crossection -> 10% less strength.

Quote:
Good luck finding the pins you need - I would think they'd be easier to find
outside of the U.S.
I think so too. I was hoping someone (perhaps a non-US member) would be able to point me to their local site.
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post #9 of 10 Old 03-19-2009 Thread Starter
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Almost, but they make them out of 303 stainless which is not as corrosion resistant as "marine grades". Why oh why, this would have been perfect. But I do think the answer is out there. All those european boats need to get their rigging parts somewhere.
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post #10 of 10 Old 03-19-2009 Thread Starter
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Quote:
Originally Posted by sailingdog View Post
DId you try McMaster Carr??
Yep. Looks like all imperial stuff.
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