# How to Specify SMR63ZZ Without Mixing Nearby Parts
Look-alike part numbers are the usual way a stores ticket goes wrong on a miniature stainless steel deep groove ball bearing. Do not substitute a chrome-steel MR63 or another SMR miniature with a different envelope. ZZ shields are part of this specification. Measure bore, OD, and width; do not issue a nearby SMR size from a mixed miniature drawer.
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SMR63ZZ is listed as a miniature stainless steel deep groove ball bearing. Because a public millimetre sheet is thin on some catalog pages, confirm bore, outside diameter, and width against your drawing or the live product listing.
Review SMR63ZZ bearing on the TFL Bearing Made-in-China listing. Shandong TFL Bearing Co., Ltd can confirm stock, packing, and any OEM marking once the drawing or sample is attached.