Can I use carriage bolts instead of the hex head bolts?

Some of our customers have successfully used carriage bolts when constructing their OP Loftbed loft beds or bunk beds, but we don't recommend it. When used in softer woods, like pine, the wood will 'strip out' allowing the square portion of the carriage bolt head to lose its 'bite' into the wood. This can keep you from being able to thoroughly tighten the fasteners. Although the carriage bolts frequently work well at first, if the bed has to be disassembled and assembled again, that is usually when the problems arise.