The project I'm working on is creating a (roughly) 4'x4' table topper that breaks down into two 4'x2' pieces. This topper will be placed on top of my 3'x3' dining table for things like board game nights. A 4'x4' table is too big for day to day purposes in my small apartment.

Currently, I have two pieces of 2'x4'x5/8" particle board for this purpose. A layer of grip mat will go between the topper and the table to protect the table and keep the topper from sliding. A play mat will be placed on top of the topper. As is, it's functional by simply placing the two pieces of particle board side by side on the table. My main concern is someone leaning on the edge of one and flipping it up. So I'd like to come up with an inexpensive option for locking them together on the underside when in use. Preferably without wearing out the particle board (like constantly installing/removing screws).

Right now the best option I've come up with is to counter sink some bolts in the top and try to get them lined up with holes in metal strips. The metal strip can then be used on the bottom and held in place with some nuts. I've also considered trying piano hinges to make it a folding topper. Before committing to anything, are there any better alternatives people can think of that only requires basic tools?[![enter image description here](https://i.stack.imgur.com/o3rto.png)](https://i.stack.imgur.com/o3rto.png)