A: The TimberLOK can be used in the ceiling joist instead of the rafter to make this uplift connection as long as the connection from joist to rafter is sufficient to transfer the load (ie 4-10d nails).
A: No. They are not thick enough. They will not pass most town codes
A: YES they are rated higher strength than a 1/2" lag screws and do not require pre-drilling to install. Ignore all answers that state they do not meet or surpass 1/2" lag screws for ledger attachment, they exceed them and they have any many other uses
A: No. They would not be of sufficient diameter and load-carrying capacity to secure a ledger board to existing framing. And, they would be too long for that use even if they were strong enough.
A: A 6x6 is 5 1/2 thick. That leaves 2 1/2 to sink into the supporting wood. If there is going to be a strong force of dirt against it I would use 10” screws. As for the spacing it depends on the load and design.
A: Yes, they will work with 6x6's. I used them to attach timbers together, but I would NOT trust them for shear strength in a framing application. If all you want to do it attach to timbers together, they will work fine. I spaced them 12" and used a staggered pattern. If you want to frame something where the fasteners are expected to provide structural shear strength, use header screws.
A: Its not easy to decipher. I would confirm with manufacturer. It also lists some specs on the box itself.
A: Based off the ESR-1078 report, this screw can handle 1,145 lbs tensile strength and 800 lbs shear strength.