A: The size of the layout, the depth throughout the dock, the body of water it is on, etc.
A: It is 1.5". Only one 2x6 will fit inside.
A: If you bought these as a pair, chances are they are the regular duty brackets (model # A-50000-2 accommodating pipe with an O.D. of 1.66"). The heavy-duty brackets (model # TD-1000-3) use pipe with an O.D. of 1.9" and cost about $42.95 each. We use the heavy- duty brackets when we are building boardwalks for hiking trails with spans of 10' and using 2x10" PT dimensional lumber for stringers.
A: Normal duty, ID 1.66".
A: Yes, you can use this with aluminum.
A: Yes, have three sections of Tommy dock , so I have two sets of them. You will need the corner peices for the end of the dock. They are very heavy duty and will last for a long time to come. Made a great dock!
A: I used these to join two wood sections can’t speak to the aluminum. If it were me I would look for a like material bracket. Steel and aluminum will corrode over time.
A: Yes, these are the correct in-line connectors for either wood or aluminum dock sections
A: Yes they are very simple to do.
A: Yes. They will work perfectly with the aluminum sections or the cedar sections. Don’t forget to get the corner brackets, both “inside” and “outside” if you plan to add a right angle to the end of the straight walk out section.