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post #1 of 8 Old 04-01-2013 Thread Starter
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Chain Plate Pin Hole Size

I am in the process of fabricating and installing new chain plates.

If the clevis pin size is 1/2 inch for turnbuckle attachment, what size should the hole in the chain plate be to except a 1/2 inch dia clevis pin?

Can I have this hole sized large enough to except both a 1/2 inch and 5/8 inch clevis pin?
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post #2 of 8 Old 04-01-2013
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You really should size the hole for one size and use that size clevis pin only. By using a smaller one you are risking problems with the clevis pin wearing out the hole when the rigging slackens and tightens during sailing.
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post #3 of 8 Old 04-01-2013
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Re: Chain Plate Pin Hole Size

I think I went 1/32" over when we made ours, I figured the more metal to metal contact between the pin and the plate the better.

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post #4 of 8 Old 04-01-2013
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Re: Chain Plate Pin Hole Size

It should be a snug fit. The more metal on metal contact the less chance for fatigue on the pin.
If you would like to go bigger with a 1/2" pin you can have a custom sleeve added, but, i'm not sure you would gain more advantage or more headaches.
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post #5 of 8 Old 04-02-2013
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Re: Chain Plate Pin Hole Size

I gave the pins to my SS guy, he made the holes in the chainplates as close fit as possible, no slop.


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post #6 of 8 Old 04-02-2013 Thread Starter
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Re: Chain Plate Pin Hole Size

Did some more measurements last night. The new turnbukles I bought have 1/2 inch (16/32 inch) dia pins. The toggles for the new Hayan turnbuckles have 17/32 inch holes(1/32 inch larger dia than pin).

Looks like the old chainplates had 18/32 inch holes in them (they are worn and elongated due to over stressing) and the old pins were 17/32 inch dia (these may be metric and reason for off size).

So it looks as if the best hole size would be 1/32 inch larger than pin, but 1/16 should be ok too I would think, though when you install a 1/2 inch pin into a 18/32 inch dia hole there is a lot more play than what I would expect. A 17/32 inch hole for that same 1/2 inch pin makes for a nice fit- almost zero play. That extra 1/32 inch of extra hole size dia makes for a lot more play in the fit up.

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post #7 of 8 Old 04-02-2013
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Re: Chain Plate Pin Hole Size

They should be drilled for the as tight as possible for the PINS as it will spread the load much more evenly on the chain plate hole

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post #8 of 8 Old 04-02-2013
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Re: Chain Plate Pin Hole Size

When a steel wheel rolls, there is only one, thin line of steel contacting the surface. No matter what the diameter of the wheel, the theoretical contact point is the same. Throw in a little compression and the contact point (line) increases, like the footprint of your tires when there's too much boat on the hitch. But, if the tire was in a ditch, it wouldn't flatten out because the load would be evenly distributed over a lager percentage of the ditch. Same thing with pins and holes. You want the hole to be as snug to the pin as practical. Something less that an interference fit but tighter than a running fit. If I were to take a guess, about 10/1000s. If the pin is truly 1/2, then 33/64 or 13mm.
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