That is certainly a larger lump than I thought it would be. So the shoulder presses into the hub and the ID of the H55 snugs up to the OD of the inner bearing race.
The outside of the H55 sits more or less flush with the outside if the inner race depending on thickness of shims… if I read it correctly.
So… the OD of the H55 is not critical, just has to be larger than the OD of the outer race and smaller than the OD of the hub.
the ID of the H55 should be a slip fit ( give or take) on the OD of the inner race.
The depth of the shoulder on the H55 is determined by the depth from the end of the hub to the edge of the cage for the rollers, because the cage sits higher than the outer race. Allowing space for shimming.
The OD of the shoulder would be a slight press fit into the hub.
Assuming I have it straight, then the shoulder in your photo looks a little thick. Maybe just the way it appears in the photo? Or the H55 was supposed to be trimmed to fit? Or yours was meant to go with the dreaded narrow bearings?
If you could tell me ( please and thank you) how thick that outer flange is…..
Total thickness of the of the H55
and total thickness of the inner flange that goes around the inner race,
Then I can figure out the rest.
ps… is that more or less the way the nilos seals work? Press into the ID of the hub and seal against the inner race?