I ordered this bearing to use in an application that required an angular contact bearing to take a certain amount of axial load. Upon receiving the bearing there were no marks on the bearing itself to note which direction the bearing should be loaded from. Without that arrow I would normally choose which way to install the bearing based on the thickness of the inner race on one side. The races were exactly the same on both sides - I question whether or not this is really an "angular contact bearing" - I saw no evidence of it. I returned the bearing as I need more confidence in the bearing I spec in.