61700 Series Bearings
The extra-thin series: on a 10 mm bore a 61700 is 15 mm across with a radial section of only 2.5 mm — the smallest section in this database, and the last rung ISO 15 lays out. It is selected when the housing wall, not the load, sets the limit.
Extra-thin serieswhere it sits and what it trades away
The 61700 series is the thinnest section tabulated here, one rung below the ultra-thin 61800. It is ISO 15 diameter series 7, the last of the diameter series the standard lays out. The step is small in absolute terms and large in proportion: on a 10 mm bore a 61700 is 15 mm across and 3 mm wide, against 19 × 5 for a 61800 and 26 × 8 for a 6000 — 2.5 mm of ring section in total, where the 6000 has 8 mm.
Catalogue tables for this series often stop around 61710, which is why it gets described as a short series. That is a fact about the catalogues and not about the standard: ISO 15 carries diameter series 7 across the same bore range as the diameter series beside it, and all 21 designations from 61700 to 61720 are tabulated here. What a short catalogue list does mean is that the larger sizes are the harder ones to actually buy — check supply before designing one in.
The trade-off is the steepest in this sub-library. A 61700 has the least ring section of anything here, so it carries the least load and is the most sensitive to shaft and housing accuracy. It is chosen by instruments, encoders and miniature mechanisms, and it is almost never chosen to carry a load: it is chosen because the wall is thin and nothing else fits.
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.
All 21 designationsISO 15 boundary dimensions, mm
| Designation | Bore code | d | D | B | r s min | Section (D − d)/2 |
|---|---|---|---|---|---|---|
| 61700 | 00 | 10 | 15 | 3 | 0.1 | 2.5 |
| 61701 | 01 | 12 | 18 | 4 | 0.2 | 3 |
| 61702 | 02 | 15 | 21 | 4 | 0.2 | 3 |
| 61703 | 03 | 17 | 23 | 4 | 0.2 | 3 |
| 61704 | 04 | 20 | 27 | 4 | 0.2 | 3.5 |
| 61705 | 05 | 25 | 32 | 4 | 0.2 | 3.5 |
| 61706 | 06 | 30 | 37 | 4 | 0.2 | 3.5 |
| 61707 | 07 | 35 | 44 | 5 | 0.3 | 4.5 |
| 61708 | 08 | 40 | 50 | 6 | 0.3 | 5 |
| 61709 | 09 | 45 | 55 | 6 | 0.3 | 5 |
| 61710 | 10 | 50 | 62 | 6 | 0.3 | 6 |
| 61711 | 11 | 55 | 68 | 7 | 0.3 | 6.5 |
| 61712 | 12 | 60 | 75 | 7 | 0.3 | 7.5 |
| 61713 | 13 | 65 | 80 | 7 | 0.3 | 7.5 |
| 61714 | 14 | 70 | 85 | 7 | 0.3 | 7.5 |
| 61715 | 15 | 75 | 90 | 7 | 0.3 | 7.5 |
| 61716 | 16 | 80 | 95 | 7 | 0.3 | 7.5 |
| 61717 | 17 | 85 | 105 | 10 | 0.6 | 10 |
| 61718 | 18 | 90 | 110 | 10 | 0.6 | 10 |
| 61719 | 19 | 95 | 115 | 10 | 0.6 | 10 |
| 61720 | 20 | 100 | 120 | 10 | 0.6 | 10 |
d = bore, D = outside diameter, B = width, r s min = minimum single chamfer dimension. All four are ISO 15 standard values and are the same for every manufacturer. 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
| Series | Type | 10 mm bore | 12 mm bore | 15 mm bore | 17 mm bore | 20 mm bore |
|---|---|---|---|---|---|---|
| 61700 Series | Extra-thin | 15 × 3 | 18 × 4 | 21 × 4 | 23 × 4 | 27 × 4 |
| 61800 Series | Ultra-thin | 19 × 5 | 21 × 5 | 24 × 5 | 26 × 5 | 32 × 7 |
| 61900 Series | Thin | 22 × 6 | 24 × 6 | 28 × 7 | 30 × 7 | 37 × 9 |
| 6000 Series | Extra-light | 26 × 8 | 28 × 8 | 32 × 9 | 35 × 10 | 42 × 12 |
| 16000 Series | Narrow | 26 × 7 | 28 × 7 | 32 × 8 | 35 × 8 | 42 × 8 |
| 6200 Series | Light | 30 × 9 | 32 × 10 | 35 × 11 | 40 × 12 | 47 × 14 |
| 6300 Series | Medium | 35 × 11 | 37 × 12 | 42 × 13 | 47 × 14 | 52 × 15 |
| 6400 Series | Heavy | — | — | — | 62 × 17 | 72 × 19 |
Outside diameter × width in millimetres, for the 5 smallest bores in this batch. The full chart across all 21 bores and all 8 series is 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.
Frequently asked questionsreading a bearing designation
Is the 61700 series the same as the 6700 series?
For the smaller sizes, yes. 61700 is the form used in ISO 15 and by SKF and FAG; 6700 is the form used by NSK, whose tables run from 6700 to 6710. Both names are indexed on this site, so either search finds the page. Above a 50 mm bore the 6700 listings run out and the 617xx form is the one to search on.
How thin is a 61700?
On a 10 mm bore, 2.5 mm of radial section — the ring measures 15 mm across, against 19 mm for the ultra-thin 61800 on the same shaft, and it is 3 mm wide. That is both the thinnest deep groove bearing this database tabulates and the thinnest that ISO 15 lays out.
How many sizes are in the 61700 series?
21 are tabulated here, 61700 to 61720, bores from 10 mm to 100 mm — the full range of ISO 15's diameter series 7 over the bores this database covers. Larger bores are in ISO 15 but not yet here.