Is this the complete ISO 492:2023 table?

No. ISO 492:2023 is the current sixth edition and covers many dimensional and geometrical characteristics. This tool reproduces only SKF-published mean cylindrical bore and outside-diameter deviation limits for its stated Normal, P6 and P5 scope.

Why must bore d and outside diameter D be entered separately?

The bore deviation range is selected from nominal bore d, while the outer-ring deviation range is selected independently from nominal outside diameter D.

Does the lookup cover tapered roller or thrust bearings?

No. The selected SKF tables apply to metric radial bearings except tapered roller bearings. Thrust, tapered roller, inch and tapered-bore bearings use other tables.

Does it calculate bore or outside-diameter variation?

No. Variation tolerances depend on additional details such as diameter series and sealing state. The former single Vdp output was therefore removed.

Are ABEC classes interchangeable with ISO classes?

Do not substitute a simple ABEC label for a complete ISO specification. Verify the exact bearing standard, characteristic and manufacturer designation required by the application.

Free Engineering Reference #049

Bearing Diameter Tolerance Lookup

Look up SKF-published mean bore and outside-diameter deviation limits for metric radial bearings except tapered roller bearings. Enter nominal д и Д separately.

SKF Tables 2–4ISO 492:2023 ContextNormal / P6 / P5

Published Deviation Limits

Mean Bore Diameter Deviation Δdmp

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Mean Outside Diameter Deviation ΔDmp

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Permissible Mean Bore Diameter

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Permissible Mean Outside Diameter

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Table Rows Used

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What the two outputs mean

Δdmp — deviation of mean cylindrical bore diameter from nominal д.
ΔDmp — deviation of mean outside diameter from nominal Д.

The permissible mean size interval shown here is nominal size plus the published lower and upper deviations (μm converted to mm).

Source boundary

Values are transcribed from SKF Rolling bearings, section A.2, tables 2–4. SKF states that standardized values are in accordance with ISO 492 and identifies these tables as applying to metric radial bearings except tapered roller bearings.

ISO 492:2023 is the current sixth edition. Its scope includes dimensional and geometrical characteristics and excludes some particular bearing types and applications. This page does not claim to reproduce its complete normative tables.

Not included: P4/P2, width, form, runout, single-plane diameter variation, diameter-series or sealed-bearing modifiers, tapered bores, tapered roller bearings, thrust bearings and inch bearings. Consult the exact current standard and product data for those characteristics.