6300 Series Deep Groove Ball Bearings

The medium series. At a given bore it is larger across and wider than every other deep groove series here except the 6400, which buys the high load capacity and the stiff shaft support of a medium bearing — at the cost of a bigger housing. It runs to a 300 mm bore and the 6400 does not, so past 100 mm this is the largest series in the library and a 6360 is the largest single bearing in it.

The 6300 series is the medium diameter series — the digit 3 in the second position. For a given bore only the heavy 6400 is larger across and wider: thicker rings, a wider section, and more room inside for rolling elements, all of which show up as load capacity and as shaft stiffness. The price is the housing bore. On a 20 mm shaft a 6304 is 52 mm across, against 47 mm for the light 6204 and 42 mm for the extra-light 6004.

The step from light to medium is not a small one in housing terms — at the same bore the outside diameter grows by more than the extra-light to light step did — but the capacity gain is the largest of the two steps as well. That makes the medium series the usual answer when a light-series bearing has been failing under load on a shaft whose diameter is fixed: the 6305 takes the same 25 mm shaft as the 6205 and the housing is the only thing that has to change.

The series runs from 6300 (10 mm bore, 35 mm outside diameter, 11 mm wide) to 6360 (300 mm bore, 620 mm outside diameter, 109 mm wide) in the 37 designations tabulated here. Note how quickly the outside diameter grows at the top end — 6360 is more than twice the bore across — which is the practical limit on how far the "just fit a bigger series" answer can be pushed before the housing becomes the problem.

Every designation in the table below links to its own page with the ISO 15 dimensions, the bore-code arithmetic, the ISO 5753-1 clearance ranges for its bore, and the same-bore comparison against every other series.

This series runs from a 10 mm to a 300 mm bore. The sub-library as a whole reaches 300 mm of bore, and the widest single bearing in it is a 6360, 620 mm across, in the 6300 series. This is one of the series that gets to that top bore.

d = bore diameter, D = outside diameter, B = width. All of them are ISO 15 standard values and are the same for every manufacturer. r s min is the minimum single chamfer dimension the plan gives; its matching maximum is in ISO 582, which is why the column says “min” and not an equality. The last column is derived: radial section = (D − d) / 2, the wall thickness you are working with when you size the housing. No load rating and no limiting speed appears here — see the bearings index for why.

Outside diameter × overall size in millimetres, for the 5 smallest bores in this database. The full charts, one per type, are on the bearings index. Reading a row is what a machine designer does when the shaft is already fixed: the bore does not change, the housing bore does. Across the type boundary the last number changes meaning — it is a width above and a height below — so compare within a type, then decide whether the job wants a ball bearing, a tapered roller or a thrust bearing at all. The 6 series whose type has no bore are not rows here: they are indexed by the shaft they run on, and their chart is above.