Deep groove ball bearings: fixed/floating side, SKF classes up to Ø 50 mm.
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When the inner ring rotates relative to the radial load. That ring tight, the other loose.
Light: j6. Normal to heavy: k5. Housing usually H7, or K7 if the outer ring need not slide. js5 only through 17 mm.
No large interference. Duursma: G or H, K at most.
Calculator
Deep groove ball bearings, cylindrical bore, up to Ø50 mm. Shaft Ø and bearing outside diameter D are two different dimensions — look up D in the bearing catalog (e.g. 6204: d=20 mm, D=47 mm).
Not the shaft Ø — the outside diameter of the selected bearing (bearing catalog).
Enter a shaft Ø and a bearing outside diameter D.
CATALOGUE RECOMMENDATION
Validity: Deep-groove ball bearings, cylindrical bore, Ø ≤ 50 mm
Assumptions: Rotating inner ring / stationary outer ring with point load. Does not account for shaft material, heat build-up, or a co-rotating outer ring — consult the bearing manufacturer's full selection table for those cases.
Simplified guideline from published bearing-manufacturer selection criteria (SKF-style) · ISO 286 deviations
Checked 2026-09-17
| Load | Shaft class | Housing — fixed | Housing — floating |
|---|---|---|---|
| Light (P ≤ 0.06 C) | j6 | J7 | H7 |
| Normal (0.06 C < P ≤ 0.12 C) | k6 | K7 | H7 |
| Heavy (P > 0.12 C) | n6 | M7 | H7 |
| Shaft class | Upper / lower deviation |
|---|---|
| j6 | +0,009 / -0,004 mm |
| k5 | +0,011 / +0,002 mm |
| k6 | +0,015 / +0,002 mm |
| n6 | +0,028 / +0,015 mm |
| Housing class | Upper / lower deviation |
|---|---|
| H7 | — |
| J7 | — |
| K7 | — |
| M7 | — |
Simplified guideline based on the general selection criteria published by bearing manufacturers (SKF, among others). Numeric deviations via the fits tool's ISO 286 tables. Consult the bearing catalog for the full selection table.
