My new project, I am building a smoker!

[T.G]

Originally Posted by kgoings

4 carriage bolts for each grate.

If you're going to use four bolts, make sure you have them all at exactly the same level. If there is any variances in the height of the bolts, you are going to have a wobbly grate which some people don't care for and if extreme, can make balancing of lopsided items on the grate difficult, causing them to tip over. Going down to three bolts will eliminate the possibility of this, but opens up a slightly increased chance of flipping the grate if you get too much weight too far out to the side.