Moss taper bearings don't fit
Posted: Mon Oct 06, 2025 7:57 am
Ordered two sets of taper bearings from Moss last week. Annoyingly the inner ones (bigger ones) don't fit as they're too small.
The stub axle measures up as 25mm, the inner diameter of the bearing is 24.6mm.
Looking up on some bearing specialist sites, that type of bearing (30205) is supposed to have an inner diameter of 25mm.
Is 0.4mm (15 thou) a normal tolerance for this kind of thing or have I been sent some poor quality bearings?
Alternatively, do I have a "oversize" stub axle? The outer bearing drops on fine, that's supposedly got an inner diameter of 17mm but according to my verniers is ~16.8mm.
The stub axle measures up as 25mm, the inner diameter of the bearing is 24.6mm.
Looking up on some bearing specialist sites, that type of bearing (30205) is supposed to have an inner diameter of 25mm.
Is 0.4mm (15 thou) a normal tolerance for this kind of thing or have I been sent some poor quality bearings?
Alternatively, do I have a "oversize" stub axle? The outer bearing drops on fine, that's supposedly got an inner diameter of 17mm but according to my verniers is ~16.8mm.