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20 mm bore bearings

50 models with a 20 mm (0.787 in) bore across 7 bearing types, outside diameters from 26 to 72 mm. Tables are grouped by type; open a model for full specs and equivalents.

50 models 26–72 mm OD range 5 brands

Angular Contact Ball Bearings (6)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
71804 71800 20 32 7 GENERIC-ISO open CN —
71904 71900 20 37 9 GENERIC-ISO open CN —
7004 7000 20 42 12 GENERIC-ISO open CN —
7204 7200 20 47 14 GENERIC-ISO open CN —
7304 7300 20 52 15 GENERIC-ISO open CN —
7404 7400 20 72 19 GENERIC-ISO open CN —

Cylindrical Roller Bearings (2)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
NU204 NU200 20 47 14 GENERIC-ISO open CN —
NU304 NU300 20 52 15 GENERIC-ISO open CN —

Deep Groove Ball Bearings (24)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
61804 61800 20 32 7 SKF open CN 4.03
61804-2RS 61800 20 32 7 SKF 2RS CN 4.03
61804-RSR 61800 20 32 7 SKF RSR CN 4.03
61804-ZZ 61800 20 32 7 NSK ZZ CN 4.4
61904 61900 20 37 9 SKF open CN 6.37
61904-2RS 61900 20 37 9 SKF 2RS CN 6.37
61904-RSR 61900 20 37 9 SKF RSR CN 6.37
61904-ZZ 61900 20 37 9 NSK ZZ CN 7
16004 16000 20 42 8 FAG open CN 7.91
6004 6000 20 42 12 SKF open CN 9.95
6004-2RS 6000 20 42 12 SKF 2RS CN 9.95
6004-RSR 6000 20 42 12 SKF RSR CN 9.95
6004-ZZ 6000 20 42 12 SKF ZZ CN 9.95
6204 6200 20 47 14 SKF open CN 13.5
6204-2RS 6200 20 47 14 SKF 2RS CN 13.5
6204-RSR 6200 20 47 14 SKF RSR CN 13.5
6204-ZZ 6200 20 47 14 SKF ZZ CN 13.5
6304 6300 20 52 15 SKF open CN 16.8
6304-2RS 6300 20 52 15 SKF 2RS CN 16.8
6304-RSR 6300 20 52 15 SKF RSR CN 15.9
6304-ZZ 6300 20 52 15 SKF ZZ CN 16.8
6404 6400 20 72 19 SKF open CN 30.7
6404-2RS 6400 20 72 19 GENERIC-ISO 2RS CN 30.7
6404-ZZ 6400 20 72 19 NTN ZZ CN 31.5

Needle Roller Bearings (4)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
HK2012FM HK 20 26 12 NTN open — 8.75
HK2016F HK 20 26 16 NTN open — 12.5
HK2020F HK 20 26 20 NTN open — 16
HK2030ZWFD HK 20 26 30 NTN open — 21.5

Self-Aligning Ball Bearings (8)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
1204 1200 20 47 14 NTN open — 10
1204K 1200 20 47 14 NTN open — 10
2204 2200 20 47 18 NTN open — 12.8
2204K 2200 20 47 18 NTN open — 12.8
1304 1300 20 52 15 NTN open — 12.6
1304K 1300 20 52 15 NTN open — 12.6
2304 2300 20 52 21 NTN open — 18.5
2304K 2300 20 52 21 NTN open — 18.5

Tapered Roller Bearings (4)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
32004 32000 20 42 15 GENERIC-ISO open CN —
30204 30200 20 47 15.25 GENERIC-ISO open CN —
32204 32200 20 47 19 GENERIC-ISO open CN —
32304 32300 20 52 22.25 GENERIC-ISO open CN —

Thrust Ball Bearings (2)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
51104 51100 20 35 10 NTN open — 14.2
51204 51200 20 40 14 NTN open — 22.3

Exact-dimension interchange groups at 20 mm bore

These d×D×B envelopes at a 20 mm bore are shared by several series or brands — the starting point for a dimensional cross reference:

Selecting a 20 mm bore bearing

The bore fixes the shaft, not the bearing capacity. At 20 mm the catalog spans 26–72 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 20 mm bore?

This index lists 50 verified bearing models with a 20 mm (0.787 in) bore across 7 bearing types, from 26 to 72 mm outside diameter. Open any model for the full specification table, seal/clearance options and graded cross references.

How do I choose between the 26–72 mm OD options for a 20 mm shaft?

On a fixed 20 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 20 mm bearings?

A 20 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 20 mm is bore code 04 (code × 5), so a 62-series bearing with this bore is the 6204.