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I'm hoping someone can help me identify what type of bolt(if it is even a bolt) this is, what it is used for and most importantly how to remove it.

This is used to attached a boat engine to a transom, there are three other normal bolts (one in the bottom of one of the pictures).

Front of bolt

back of bolt

AidanO
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    could be some type of a security device, similar to the kind on expensive automobile wheels – jsotola Feb 14 '19 at 07:33
  • @jsotola you are correct, it is to prevent the bolt from being removed without a key, I will add an answer and some pictures later. – AidanO Feb 15 '19 at 14:51

1 Answers1

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My guess would be a carriage bolt, but it's impossible to tell for sure. Take the nut off the inside, hit the bolt with a mallet and see what happens.

Edit based on addition of interior photo...

I wonder if that big black cylinder is some type of damper intended absorb shock and vibration. Maybe the one on the other side failed and they replaced it with a regular bolt. You might try a channellock pliers or such to take it off (if that's your goal). Or post this to a boat forum and see if anybody has a better answer.

CoAstroGeek
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  • I think so too. It looks like a common carriage bolt with a proprietary retainer underneath it. The rusty galvanized bit hooks over the transom to prevent the bolt from rotating when the nut is tightened. – isherwood Feb 12 '19 at 17:54
  • I dont see any nut on the inside, I've updated the inside picture link – AidanO Feb 12 '19 at 23:38