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Old 28-02-2022, 01:35   #1
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Oceanis 430 (1988) keel bolt details

Dear Brains Trust,
We are in need of some details on the keel bolts in our newly acquired Oceanis 430 - 1988 (equivalent) - this action is to meet our Marine Survey requirements.
We have obtained the overall specs on bolt sizes and torque settings from Beneteau France but this only gives us the sizes from M14 through to M36 - no details on lengths and actual layout (so we don't miss any) for our particular vessel.
We would prefer to not pull a bolt to find out this detail only to find the each diameter has a differing length.
Does anyone know of where we can find such details, or better still, have experience with acquiring keel bolts for Beneteau yachts for this size boat?

All help will be greatly appreciated - yours in the brine.
Bundy Mark
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Old 28-02-2022, 03:31   #2
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Re: Oceanis 430 (1988) keel bolt details

Greetings and welcome aboard the CF, Bundy Mark.
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Old 28-02-2022, 07:12   #3
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Re: Oceanis 430 (1988) keel bolt details

Can't directly help you, but:

I'm gathering from your description that the bolt heads are in the bilge and the nuts imbedded in the keel, right?

Then I recommend that you, at the dock with no big forces on the keel, remove and return them one at a time, measuring as you go. There is plenty of redundancy in the matrix of bolts. You are going to have to do that to replace them in any case.

Did the company also specify the grade of the bolts? That's really important.

Good luck with the project. It will be reassuring to know that your keel is going to stay with you in the next storm.
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Old 28-02-2022, 07:33   #4
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Re: Oceanis 430 (1988) keel bolt details

Beneteau used to sell "keel bolt" kits why not reach out to them and see if they can put together a kit of the correct galvanized bolts for your keel.
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Old 01-03-2022, 04:56   #5
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Re: Oceanis 430 (1988) keel bolt details

Big thanks for all the suggestions & links.
I'm not sure if the "thanks" button worked along side what I had said in appreciation but your assistance is greatly appreciated.
Thank You
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Old 01-03-2022, 06:55   #6
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Re: Oceanis 430 (1988) keel bolt details

the grade is sometimes indicated on the head of the bolts/screws.
and pay attention to the tightening torque, dry or oiled screws?
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Old 09-05-2022, 11:35   #7
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Re: Oceanis 430 (1988) keel bolt details

I don't know if you found the answer yet, but I did, we have a Beneteau Oceanis 430 1987 and my husband removed 7 bolts bolts of 10 already, last month. the bolts are grade 8 galvanized and mesure 3.5 inches, The seven of them were all clean no rust at all on the thread, just the head, was so rusted, that my husband had to use a dremel to resize the head, then a hamer drill with a 27mm socket to 24mm to removed them. He did one bolt a day, the last three of them are under the floor close to the bilge, but impossible to reach without removing the floor. I could send you some picture if you want and did not do the job yet.
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Old 09-05-2022, 13:50   #8
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Re: Oceanis 430 (1988) keel bolt details

Quote:
Originally Posted by Laureat View Post
mesure 3.5 inches, .
Really? Id expect them to be at least double that. Im surprised
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Old 09-05-2022, 14:31   #9
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Re: Oceanis 430 (1988) keel bolt details

Quote:
Originally Posted by Tetepare View Post
Really? Id expect them to be at least double that. Im surprised
Ahh, but shorter bolts are cheaper... and the accountants who drive design know that! (Only sorta kidding here).

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Old 09-05-2022, 14:40   #10
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Re: Oceanis 430 (1988) keel bolt details

I think Google will tell you that the minimum thread engagement depth for full strength in steel is 1 to 1-1/2 times the bolt diameter.
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Old 09-05-2022, 14:44   #11
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Re: Oceanis 430 (1988) keel bolt details

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Originally Posted by Jim Cate View Post
Ahh, but shorter bolts are cheaper... and the accountants who drive design know that! (Only sorta kidding here).

Jim
Nah ! I think you pretty much nailed it the first time
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Old 09-05-2022, 14:49   #12
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Re: Oceanis 430 (1988) keel bolt details

Looking at it another way, with conventional bolt-on keels, how much thread engagement is there? I don't mean into the lead keel, but where the threaded joint is - the depth of the nut. Is that 3-1/2 inches?
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Old 09-05-2022, 14:49   #13
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Re: Oceanis 430 (1988) keel bolt details

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Originally Posted by sandy stone View Post
Looking at it another way, with conventional bolt-on keels, how much thread engagement is there? I don't mean into the lead keel, but where the threaded joint is - the depth of the nut. Is that 3-1/2 inches?
Beneteau ... iron keel.
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Old 09-05-2022, 14:51   #14
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Re: Oceanis 430 (1988) keel bolt details

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Beneteau ... iron keel.
I agree, but I don't understand what you're getting at.
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Old 09-05-2022, 14:54   #15
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Re: Oceanis 430 (1988) keel bolt details

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I agree, but I don't understand what you're getting at.
You said ...
"I don't mean into the lead keel"
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