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TLDR: Trying to identify the right kind of replacement ball bearing. Usually they have a standard code # which can be supplied by different manufacturers. But the ones I need don't seem to fit that system.

We have a number of fan heaters, some of which are making noise (others are dead quiet). These are a hot-water type which are installed in walls or in the "kickspace" under cabinets, and the fan blows air over the HW coil.

Upon inspection it is the rotating fan / motor assembly that is producing the noise, and that whole assembly can be removed for service / replacement. I've exposed the bearings which are noisy, but am having trouble identifying a replacement.

The bearing is stamped BB1023 but this doesn't seem like a standard bearing code. Does anyone know how to interpret this number and/or is there an equivalent standard code?

Ideally someone may know of a canonical reference to bearing codes. I have found references which purport to be such a thing, but don't include this numbering.

(If not I will probably just measure the originals with a caliper & try to find the best match that way; this just seems more likely to go wrong because not only the obvious dimensions are important.)

Notes:

  • The few bearings I can find online with that code are much more $$ than I would normally expect, so either these really are specialized and nonstandard or they are just hard to find with that nomenclature.

  • In a few cases the BB1023 code seems to be cross-referenced with 627N1Z and other codes ... but I am somewhat mistrustful of the correctness of random product information. And 627N1Z seems to be an oddball code also when I've tried to find it in catalogs.

  • The heaters happen to be common Beacon-Morris models, and entire replacement fans are available but at a much greater cost than what I'd expect just the bearings to be.

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StayOnTarget
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The way to find different bearings is by the size bb1023 crosses to a double sealed 6.35 x22 x7 mm bearing Mr627zz is the same id/od and 1/4” thick so it is slightly thicker and may work under 5 bucks. Looking at the bearing specs I would give it a try. I cross bearings for motors all the time, I can tell you a timkin or sky bearing in some cases is worth the extra but in a light duty motor like a fan I would save a few $ Mr627-2rs Mr627zz I thought I typed in the wrong size after double checking my answer but I just typed the size wrong in the answer corrected.

Ed Beal
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    What did you use to find the size of a bearing stamped with BB1023? Is there some standard table somewhere that lists this? – JPhi1618 Nov 01 '19 at 14:52
  • I found Timken or SKF bearings matched any sizes I was looking for... usually went to a bearing specialist though - either with the numbers or caliper measurements... – Solar Mike Nov 01 '19 at 16:57
  • The BB might stand for Berry Bearing. I used to get bearing from them when I was a mechanic at a steal heat treating co. All their numbers were BB ????.. They've been out of business for like 15 years... – JACK Nov 01 '19 at 19:14
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    @Jphil1619 , I used a Mcguire cross reference book , they provide them every so often as my company purchases a large number of bearings, Mcguire is a local distributor first you look up the bearing the listing provides the size and the part numbers they carry. I think they might have a cross on their site but I use the book , guess I am old school. – Ed Beal Nov 01 '19 at 22:11
  • Yup, MR627-ZZ/.250 was a perfect replacement. I got these from Amazon and the supplier was "Boca Bearing". So maybe that's the origin of the BB in the number. https://www.bocabearings.com/products/mr627-zzc--250-ps2-669 – StayOnTarget Nov 11 '19 at 12:23