A-Frame Bracket for 4x8 swing beam
I would refrain from using that type of fastener. I believe it will allow a lot of movement. I made a sketch to show what I have made before, many years ago. It does not have any hangers just angled notches that allow the legs to fit tightly and notches that act as a setting for the beam to bear on. A single bolt will draw it all together, or two could be used.


The legs are also splayed to help stabilize the swingset, and give more room for the swings.

7/12/2016 Edit

All it really takes is a circular saw set at 5 degrees or so. No set angle, just something that would draw tight as the bolt tightens. The notches on the beam are the same depth alll the way through. Just determine the angle you want the legs to splay at and make sure the overall width of the cut on the side is no wider than the leg material, otherwise the fit may be loose. The legs are what is cut at the angle. I added some sketches to help elaborate a little. 






I hope it helps.