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55 mm bore bearings

40 models with a 55 mm (2.165 in) bore across 5 bearing types, outside diameters from 72 to 140 mm. Tables are grouped by type; open a model for full specs and equivalents.

40 models 72–140 mm OD range 3 brands

Angular Contact Ball Bearings (6)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
71811 71800 55 72 9 GENERIC-ISO open CN —
71911 71900 55 80 13 GENERIC-ISO open CN —
7011 7000 55 90 18 GENERIC-ISO open CN —
7211 7200 55 100 21 GENERIC-ISO open CN —
7311 7300 55 120 29 GENERIC-ISO open CN —
7411 7400 55 140 33 GENERIC-ISO open CN —

Cylindrical Roller Bearings (4)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
NU211 NU200 55 100 21 GENERIC-ISO open CN —
NU2211 NU2200 55 100 25 GENERIC-ISO open CN —
NU311 NU300 55 120 29 GENERIC-ISO open CN —
NU2311 NU2300 55 120 43 GENERIC-ISO open CN —

Deep Groove Ball Bearings (23)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
61811 61800 55 72 9 SKF open CN 9.04
61811-2RS 61800 55 72 9 SKF 2RS CN 9.04
61811-RSR 61800 55 72 9 SKF RSR CN 9.04
61811-ZZ 61800 55 72 9 NSK ZZ CN 9.7
61911 61900 55 80 13 SKF open CN 16.5
61911-2RS 61900 55 80 13 SKF 2RS CN 16.5
61911-RSR 61900 55 80 13 SKF RSR CN 16.5
61911-ZZ 61900 55 80 13 NSK ZZ CN 17.6
6011 6000 55 90 18 SKF open CN 29.6
6011-2RS 6000 55 90 18 SKF 2RS CN 29.6
6011-RSR 6000 55 90 18 NSK RSR CN 31
6011-ZZ 6000 55 90 18 SKF ZZ CN 29.6
6211 6200 55 100 21 SKF open CN 46.2
6211-2RS 6200 55 100 21 SKF 2RS CN 46.2
6211-RSR 6200 55 100 21 NSK RSR CN 47.5
6211-ZZ 6200 55 100 21 SKF ZZ CN 46.2
6311 6300 55 120 29 SKF open CN 74.1
6311-2RS 6300 55 120 29 SKF 2RS CN 74.1
6311-RSR 6300 55 120 29 NSK RSR CN 78.5
6311-ZZ 6300 55 120 29 SKF ZZ CN 74.1
6411 6400 55 140 33 SKF open CN 99.5
6411-2RS 6400 55 140 33 GENERIC-ISO 2RS CN —
6411-ZZ 6400 55 140 33 GENERIC-ISO ZZ CN —

Spherical Roller Bearings (3)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
22211 22200 55 100 25 GENERIC-ISO open CN —
21311 21300 55 120 29 GENERIC-ISO open CN —
22311 22300 55 120 43 GENERIC-ISO open CN —

Tapered Roller Bearings (4)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
32011 32000 55 90 23 GENERIC-ISO open CN —
30211 30200 55 100 22.75 GENERIC-ISO open CN —
32211 32200 55 100 26.75 GENERIC-ISO open CN —
32311 32300 55 120 45.5 GENERIC-ISO open CN —

Exact-dimension interchange groups at 55 mm bore

These d×D×B envelopes at a 55 mm bore are shared by several series or brands — the starting point for a dimensional cross reference:

Selecting a 55 mm bore bearing

The bore fixes the shaft, not the bearing capacity. At 55 mm the catalog spans 72–140 mm outside diameter: the light sections suit compact housings and moderate duty, while the larger ODs use bigger rolling elements and carry substantially more load. Select first by the required dynamic load rating C for the calculated L10 life, then by available radial space.

For a rotating inner ring a k5 shaft seat with an H7 housing is the usual starting point; an interference fit plus thermal growth consumes internal clearance, so C3 is the common industrial default rather than CN. Sealed variants (-2RS, -ZZ) trade a small amount of speed for contamination protection and maintenance-free operation — compare the sealed and open versions of the same envelope before substituting one for the other.

Frequently asked questions

What bearings have a 55 mm bore?

This index lists 40 verified bearing models with a 55 mm (2.165 in) bore across 5 bearing types, from 72 to 140 mm outside diameter. Open any model for the full specification table, seal/clearance options and graded cross references.

How do I choose between the 72–140 mm OD options for a 55 mm shaft?

On a fixed 55 mm bore, a smaller outside diameter means a lighter section for limited housing space and moderate load; a larger OD with a wider ring carries more radial and axial load and lasts longer at the same duty. Compare the C dynamic load rating in each model table, then match seal type, internal clearance (CN/C3/C4) and precision class to the actual mounting and operating temperature.

What shaft fit and bore code apply to 55 mm bearings?

A 55 mm bore on a rotating inner ring normally uses a k5 shaft seat with an H7 housing bore (verify against the catalogue for heavy or stationary-ring duty). In the ISO designation system 55 mm is bore code 11 (code × 5), so a 62-series bearing with this bore is the 6211.