The #8 screw will be stronger in heavy pieces, but the increased size makes it harder to drive, and there are circumstances, like if it's going into a thin piece, where it can weaken the wood.
The #6 isn't as strong, but it's a lot easier to drive and less likely to split the wood.
Remember in either case to drill pilot holes, because without them you will split the wood no matter what. And pick up a countersink so you can put the heads flush with the surface. A countersunk screw make a much more polished looking final project.
claydowling
Sun, 04/24/2011 - 17:43
Depends on what you're building.
The #8 screw will be stronger in heavy pieces, but the increased size makes it harder to drive, and there are circumstances, like if it's going into a thin piece, where it can weaken the wood.
The #6 isn't as strong, but it's a lot easier to drive and less likely to split the wood.
Remember in either case to drill pilot holes, because without them you will split the wood no matter what. And pick up a countersink so you can put the heads flush with the surface. A countersunk screw make a much more polished looking final project.