3

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

  • 2
    could be some type of a security device, similar to the kind on expensive automobile wheels – jsotola Feb 14 at 7:33
  • @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 at 14:51
4

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.

  • 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 at 17:54
  • I dont see any nut on the inside, I've updated the inside picture link – AidanO Feb 12 at 23:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.