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Some say yes and some say no, yet the drawing shows one ? br It is the same with eg car wheel bearings. My MGBGT front wheels bearings have an inner spacer and special pick off shims to allow the bearing nuts (2) to be done up tight without putting pressure on the rollers and setting a precise runout. None of my trailer bearings have this and it is just a case of do it up, back off a bit and use a split pin to hold the nut. For a belt sander such care should be of little value but can be used to give a false sense of quality to something that is about the same a conveyor roller mass produced for a couple of quid. If the mounting is crude and allows someone just to keep tightening a bolt putting pressure on the bearing then a spacer protects against numpties. I think in this application I would put more emphasis on being able to replace the bearings easily as the abrasive dust will keep getting throught the seals.

Martin connellyPete rimmerJeff daymanமார்டின் கோநிலீபீட் ரிம்மர்