Looking for a measurement of an installed seal.I think that there is a lip in the axle that the seal will contact to stop. This is the depth for it, enough to clear the bearing.
Thanks Johnseal depth from face of housing flange to face of installed seal is 1.680 inches (1 11/16 ) as stated above there is a lip to bottom the seal to so it does not contact the bearing lock collar.
if you are measuring from the backing plate surface add 1/8 inch for the thickness of the backing plate