You have to be careful when buying bolts, they have to be suitable for the purpose. The amount of tension & heat they have to take, I'd be hesitant to use something from a hardware store.
A truck driver known by a friend of mine bought his chains at Home Depot to tie down his load of steel coils instead of using the correctly rated safety chains. He was hauling close to his maximum load (120,000 lbs) and the chains snapped, luckily the roll went into the ditch & didn't flatten any cars. Same principal applies, you have to know the rating of the bolt & the rating required for the application.