ISO 582 — Chamfer dimension limits
The other half of the corner on a bearing ring: ISO 15 gives the minimum chamfer, ISO 582 gives the maximum that goes with it.
Why two standards
A bearing ring corner is not a dimension anyone can hold to a single value, so it is bounded from both sides. The chamfer dimension r s min in an ISO 15 table is a floor: the ring must not be more rounded at that corner than the figure says, because the corner has to clear the fillet left in the shaft shoulder by the turning tool. ISO 582 supplies the ceiling. A corner between the two limits is acceptable; ISO 15 alone does not say what the ceiling is.
The rule that actually matters in a design office
- r s min
- The minimum single chamfer on the ring corner, from ISO 15. This is the number printed on every bearing page in this library, and it is a limit in the direction opposite to the one people expect: it constrains the shaft, not the ring.
- Shaft and housing fillet
- The largest single fillet radius allowed on a shaft shoulder or housing shoulder is the r s min of the ring corner that butts against it. A larger fillet does not sit in the corner — it lifts the ring face off the shoulder, and the bearing is then located by nothing.
- Gauge, not a measured value
- Both figures describe the arc the corner must lie inside. The actual profile of a chamfer is not fixed by either standard, so a chamfer that measures between the limits is acceptable whatever its shape.
The chamfer minimums used in this libraryfrom the ISO 15 plan, with where each one appears
| r s min | Bore range using it | Series using it |
|---|---|---|
| 0.3 mm | 10–60 mm | 160, 60, 618, 619 |
| 0.6 mm | 10–85 mm | 160, 60, 618, 619, 62, 63 |
| 1 mm | 12–100 mm | 160, 60, 618, 619, 62, 63 |
| 1.1 mm | 17–100 mm | 60, 619, 62, 63, 64 |
| 1.5 mm | 25–100 mm | 60, 62, 63, 64 |
| 2 mm | 40–90 mm | 62, 63, 64 |
| 2.1 mm | 50–100 mm | 62, 63, 64 |
| 3 mm | 70–100 mm | 63, 64 |
| 4 mm | 85–100 mm | 64 |
Every figure in the first column is a minimum, and only a minimum. This page gives no matching maximum, and that is deliberate: ISO 582:1979 attached a single maximum to each r s min, while ISO 582:1995 replaced that with maxima that vary with bore, so the same r s min has different ceilings on a 20 mm and a 400 mm bearing. Two editions cannot share one column, and a column that averaged them would look complete and be wrong for half its rows. Read the limit for a specific bearing from the edition the drawing calls up.
The value steps with the series, not smoothly with size
At a fixed bore the chamfer minimum depends on which diameter series the bearing belongs to, because a heavier section has more material at the corner to round off. Two bearings of the same bore from different series therefore need different shoulder fillets in the shaft that carries them, and a housing bored for one series may not clear the ring of another even though both share a bore and an outside diameter.