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Metric bearings are probably more common now than SAE ones. Any bearing supplier will have or be able to get the right one for you.
Posts by Cherryville Chuck
Router
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Joined
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I thought you were talking about a bearing on the router and not a bearing on a bit. Check with the major manufacturers and on Lee Valley's website. They all have bearings listed that show I.D. and O.D. You can alter a lot of profiles by changing a bearing. For example a round over bit with a smaller bearing will give you a rounded edge with two fillets with the height adjusted properly. You cam get laminate trim bits with oversize bearings to trim too much laminate overhang down before trimming to proper size with the correct bearing on. (They call them overhang bits. Laminate tends to chip if it has too much overhang.) So it's common to use different bearing sizes but the ID of the bearing MUST match the the size of the bit where the bearing mounts on.
There also rub collars that can go over your bearings that can change the depth of cut. Here's an example from Woodcraft: https://www.woodcraft.com/search?q=bearing+collars&button=search I have a set of 4 out in my shop like them. Then there is also this set of bearing/collars from Infinity Tools that fit the very common 3/16" post size on router bits: https://www.infinitytools.com/16-pc-ultimate-router-bit-bearing-ki
There also rub collars that can go over your bearings that can change the depth of cut. Here's an example from Woodcraft: https://www.woodcraft.com/search?q=bearing+collars&button=search I have a set of 4 out in my shop like them. Then there is also this set of bearing/collars from Infinity Tools that fit the very common 3/16" post size on router bits: https://www.infinitytools.com/16-pc-ultimate-router-bit-bearing-ki
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