Shaft
Diameter
Load Bearing
Capacity
Inside Post
Diamter Round
Inside Post
Diamter Square
4x4 Post 6x6 Post
Wood Metal Wood Metal
6" 6,000 lbs 2" 1-3/8"
8" 10,000 lbs 4" 2-3/4"
10" 12,800 lbs 6-13/16" 4-3/4"
12" 18,000 lbs 10-1/4" 7-1/4"