I just happen to have here at home the small piece of table top that John T just described to you. You didn’t say what year 340 you have, but I also have a 2000 340 as John is showing you.
My friends 1997 340 had just a slightly different table top on his. Just enough of a difference that the two were not interchangeable. But his had a great pulley system incorporated into the table to ease the raising and lowering. That table is heavy!
So all that being said, give us the year of your 340 and maybe we can get you the dimensions you need.
I can’t get near my boat at this time to measure it for you. It’s covered with 4 inches of snow and its own polar ice cap.
We are expecting some thawing later this week though.
In the mean time, JohnT has detailed it perfectly for you. Here are some pictures for you to look at also.
The table top thickness is 3/4 inches. With the top and bottom laminate it measures 7/8 inches thick.