2300 Series Self-aligning Ball Bearings
The widest envelope in the self-aligning group: the 2300 takes the 1300's outside diameters and widens the ring, so a 2304 is 20 × 52 mm across exactly as a 1304 is, and 21 mm wide against the 1304's 15.
Medium, wide serieswhere it sits and what it trades away
The wide version of the 1300 series, and the largest envelope in the self-aligning family: same bore and same outside diameter as the 1300 at every bore code, in a wider ring — a 2304 is 20 × 52 × 21 mm against 20 × 52 × 15 mm for the 1304, and a 2320 is 100 × 215 × 73 against 100 × 215 × 47. Within the family that is where the load capacity is, and because the outside diameter stays on the 1300 ladder it costs axial room rather than a bigger housing.
Two decisions in one series number. The leading 2 is a width series and the 3 a diameter series, written together as 23. So a 2300 is the wide version of the medium envelope: same outside diameter ladder as the 1300, a wider ring on every row. A 2304 is 20 × 52 × 21 mm where a 1304 is 20 × 52 × 15 mm — the housing bore is unchanged and 6 mm more of the shaft is taken up.
Where this becomes the heavy end of the group. Of the four self-aligning series tabulated here, the 2300 carries the widest ring at a given bore, and its largest member is the biggest envelope in the group. That is the combination to reach for when a self-aligning bearing is needed, the radial load is substantial, and the axial space is available — but the housing around the shaft cannot grow. It is not a substitute for a roller bearing where the load is genuinely heavy; it is the most a ball bearing on a sphered seat will do.
Reading the designation. 2304 is the dimension series 23 followed by the bore code 04 — 2 for the width series and 3 for the diameter series. The type code is 1 and, as in the 2200 family, it is not written. The bore code is the one this library uses throughout: 00, 01, 02 and 03 are 10, 12, 15 and 17 mm, and from 04 upwards the code multiplies by five. So the number states the dimension series and the bore code, and nothing in it says which type the bearing is — where a 6204 leads with the type code 6.
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 an explanation of why no radial clearance table appears for this type.
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.
All 21 designationsISO 15 boundary dimensions, mm
| Designation | Bore code | d | D | B | r s min | Section (D − d)/2 |
|---|---|---|---|---|---|---|
| 2300 | 00 | 10 | 35 | 17 | 0.6 | 12.5 |
| 2301 | 01 | 12 | 37 | 17 | 1 | 12.5 |
| 2302 | 02 | 15 | 42 | 17 | 1 | 13.5 |
| 2303 | 03 | 17 | 47 | 19 | 1 | 15 |
| 2304 | 04 | 20 | 52 | 21 | 1.1 | 16 |
| 2305 | 05 | 25 | 62 | 24 | 1.1 | 18.5 |
| 2306 | 06 | 30 | 72 | 27 | 1.1 | 21 |
| 2307 | 07 | 35 | 80 | 31 | 1.5 | 22.5 |
| 2308 | 08 | 40 | 90 | 33 | 1.5 | 25 |
| 2309 | 09 | 45 | 100 | 36 | 1.5 | 27.5 |
| 2310 | 10 | 50 | 110 | 40 | 2 | 30 |
| 2311 | 11 | 55 | 120 | 43 | 2 | 32.5 |
| 2312 | 12 | 60 | 130 | 46 | 2.1 | 35 |
| 2313 | 13 | 65 | 140 | 48 | 2.1 | 37.5 |
| 2314 | 14 | 70 | 150 | 51 | 2.1 | 40 |
| 2315 | 15 | 75 | 160 | 55 | 2.1 | 42.5 |
| 2316 | 16 | 80 | 170 | 58 | 2.1 | 45 |
| 2317 | 17 | 85 | 180 | 60 | 3 | 47.5 |
| 2318 | 18 | 90 | 190 | 64 | 3 | 50 |
| 2319 | 19 | 95 | 200 | 67 | 3 | 52.5 |
| 2320 | 20 | 100 | 215 | 73 | 3 | 57.5 |
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.
Every series at one boresame shaft, different housing
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.
Frequently asked questionsreading a bearing designation
What is the difference between a 2300 and a 1300?
Width, and only width. Both are diameter series 3, so both take the same housing bore at a given shaft diameter — on a 20 mm shaft, 52 mm either way. The 2300 is the wider of the two width series: 21 mm wide against the 1300's 15 mm, with the wider ring carrying the larger radial load. Choose on whether the axial space exists and whether the load needs it.
Is the 2300 a heavy-duty bearing?
It is the heaviest of the self-aligning ball series in this library, and it is still a ball bearing on a sphered seat. Its two rows carry far less than a roller bearing of the same envelope would, and almost nothing along the shaft. Where the load is genuinely heavy, a roller bearing is the right move and this type is not — the widths here buy capacity within a ball bearing's limits, not beyond them.
Why does the same bearing size never appear under two names in this table?
Because every row is one designation and one dimension series. Two families can share an outside diameter — the 1300 and the 6300 do — but then they differ in width, or in type, or in both, and the table lists each of them once. Where the numbers coincide completely and the bearings differ only inside, the page says so rather than merging the rows.