Bearing number decoder: series, bore codes & suffixes
A designation is a structured identifier, not a universal arithmetic formula. Read the complete prefix, basic number and suffix together.
On this page5 sections ⌄
Try the interactive designation decoder
Enter the complete manufacturer marking to read supported suffixes and retrieve real catalogue records.
Open brand-specific decoder →What to check
Common metric bore codes
For many standard metric radial bearings, final bore codes 00, 01, 02 and 03 represent 10, 12, 15 and 17 mm; many subsequent two-digit codes represent five times the code. Miniature, inch, special and slash-coded designs are exceptions.
Do not infer outside diameter or width
Two bearings with the same bore code can have different diameter and width series. Use the model charts below or the actual product drawing.
Suffixes change the specification
Closure, clearance, cage, precision and internal design can all appear in suffixes. Keep them when searching; compare the base number only as a second step.
Continue with real catalogue data
Preserve the full model, source description and unknown fields when making your shortlist. This reference website does not sell bearings or certify a replacement.
Related questions and tools
How to measure bearing bore, outside diameter & width
Record the component marking before measuring. The size finder expects bore d, outside diameter D and width B in that order, not the order in which the numbers happen to appear on a label.
Read and apply →Inch bearing sizes, fractions & millimetre conversion
One inch is exactly 25.4 mm. Unit conversion changes the expression of a size, not its physical size or tolerance.
Read and apply →Bearing dimension chart: sizes, brands & variants
This is a database-backed index, not a guessed standard-size list. Each model chart shows recorded dimensions and opens the actual products behind them.
Read and apply →Bearing weight & mass lookup
Bearing mass is a catalogue attribute. A solid-ring estimate cannot reproduce the mass of rings, rolling elements, cage and seals.
Read and apply →Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.