Methodology & Data Sources

How this cross-reference is built, where the numbers come from, and the limits of what we publish. Data version 2026.06.

What we cross-reference

Every page covers one bearing designation (e.g. 6204) and lists how each major brand designates the same part. The basis for interchange is that deep groove ball bearings are built to the standardized boundary dimensions in ISO 15 (equivalent to GB/T 276, JIS B 1512, DIN 625). So the bore (d), outer diameter (D) and width (B) are common across brands.

Sources

• Boundary dimensions — ISO 15:2017, the international standard each manufacturer conforms to.
• Brand seal/shield suffixes — each manufacturer's own designation system (e.g. SKF 2RSH, NSK DDU, FAG 2RSR). We link to each brand's official catalog so you can verify.

Confidence scoring

Each cross-reference is labelled by match type. Dimensional means the boundary dimensions are identical per ISO 15 — high confidence, because it follows directly from the standard. We do not claim "drop-in" equivalence: suffixes for clearance, precision, seals, cage and lubrication must still be matched.

Why we do NOT publish load ratings

Dynamic (Cr) and static (C0r) load ratings vary by brand and internal design and are a safety-critical selection parameter. We deliberately exclude them rather than risk publishing a value someone relies on for a load-bearing decision. Read load ratings directly from the manufacturer's catalog (linked on every page).

Update cadence

Manufacturer catalogs change. Each page carries a "last updated" date and the dataset version above. Boundary dimensions (ISO 15) are stable; suffix naming is reviewed against catalogs periodically.

Maintained by

IndustriCross — engineering specification cross-reference. Corrections welcome.