1300 Series Self-aligning Ball Bearings

The medium self-aligning series: one step larger across and wider than the 1200, on the same arrangement of two ball rows and a sphered outer raceway. It shares its boundary dimensions with the 6300 series the way the 1200 shares with the 6200 — a 1304 is 20 × 52 × 15 mm, the same as a 6304, and a 1320 is 100 × 215 × 47 against the 6320's 100 × 215 × 47. So this is where you land when the 1200 envelope is too small and the alignment requirement rules out a deep groove bearing.

Medium, on the deep groove ladder's middle rung. The second digit of 13 is 3 — the diameter series a 6304's middle digit names — so the 1300 and the 6300 are the same bearings on the outside and row-for-row identical in the tables: 1304 is 20 × 52 × 15 mm and 6304 is 20 × 52 × 15 mm. Put the 1300 beside the 1200 and the step is the ordinary one from light to medium: on a 20 mm shaft, 47 mm across becomes 52 mm, and 14 mm wide becomes 15.

When the light series runs out. Medium is the step taken when the radial load has outgrown the light envelope but the housing can still grow a little. A 1300 carries more than the 1200 of the same bore and needs more room around the shaft to do it — the same trade every diameter series in this library makes, and the reason the series field exists at all: the shaft diameter is fixed by the machine, and the bearing is chosen from what is left around it.

Reading the designation. 1304 is the self-aligning type code 1, the dimension series 03 and the bore code 04. As in the 1200 family the width series is 0 and is not written, so the digit that follows the type code is a diameter series: 3 here. The bore code is unchanged — 00, 01, 02 and 03 are 10, 12, 15 and 17 mm, and from 04 upwards the code multiplies by five. Note that it is the second digit, not the first, that ties this family to the 6300: diameter series 3 either way.

Every designation in the table below links to its own page with the ISO 15 dimensions, the bore-code arithmetic, the same-bore comparison against every other series and type, and the reason this type carries no radial clearance table here.

This series runs from a 10 mm to a 100 mm bore. The sub-library as a whole reaches 200 mm, and the widest single bearing in it is a 6340, 420 mm across, in the 6300 series. This one stops short of it.

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.