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50.8 mm bore bearings

43 models with a 50.8 mm (2.000 in) bore across 2 bearing types, outside diameters from 82.55 to 123.825 mm. Tables are grouped by type; open a model for full specs and equivalents.

43 models 82.55–123.825 mm OD range 2 brands

Insert Bearings (Y-bearings) (6)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
YSA-211-2FK-HE-2311 YSA2 50.8 100 40 SKF 2RS CN 43.6
YAT-211-200 YAR2 50.8 100 45 SKF open CN 43.6
YSP-211-200-SB-2F YSP2 50.8 100 49.2 SKF 2RS CN 43.6
YAR-211-200-2F YAR2 50.8 100 55.6 SKF 2RS CN 43.6
YAR-211-200-2RF YAR2 50.8 100 55.6 SKF 2RS CN 43.6
YEL-211-200-2F YEL2 50.8 100 55.6 SKF 2RS CN 43.6

Tapered Roller Bearings (37)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
LM104949-911 LM104900 50.8 82.55 21.59 SKF open CN 88.9
LM104949-LM104911 4t-inch 50.8 82.55 21.59 NTN open CN 77.5
18790-18720 18700 50.8 85 17.462 SKF open CN 62.1
18790-18720-NTN 4t-inch 50.8 85 17.462 NTN open CN 55
18790-18724 4t-inch 50.8 88.9 17.462 NTN open CN 55
368-362A 4t-inch 50.8 88.9 20.638 NTN open CN 85
368A-362A 365 50.8 88.9 20.638 SKF open CN 94
370A-362A 4t-inch 50.8 88.9 20.638 NTN open CN 85
368A-362 4t-inch 50.8 90 20 NTN open CN 85
368A-362X 365 50.8 90 25 SKF open CN 94
28580-28521 4t-inch 50.8 92.075 24.608 NTN open CN 93
3775-3720 4t-inch 50.8 93.264 30.162 NTN open CN 113
3780-3720 3700 50.8 93.264 30.162 SKF open CN 134
3780-3720-NTN 4t-inch 50.8 93.264 30.162 NTN open CN 113
33889-33821 4t-inch 50.8 95.25 27.783 NTN open CN 119
3780-3726 4t-inch 50.8 95.25 30.162 NTN open CN 113
385A-382A 4t-inch 50.8 96.838 21 NTN open CN 86.5
28678-28622 4t-inch 50.8 97.63 24.608 NTN open CN 98
3780-3732 4t-inch 50.8 98.425 30.162 NTN open CN 113
49585-49520 4t-inch 50.8 101.6 31.75 NTN open CN 122
529-522 4t-inch 50.8 101.6 34.925 NTN open CN 150
45284-45220 4t-inch 50.8 104.775 30.162 NTN open CN 144
455-453X 4t-inch 50.8 104.775 30.162 NTN open CN 127
59200-59412 4t-inch 50.8 104.775 36.512 NTN open CN 158
HM807046-010 HM807000 50.8 104.775 36.512 SKF open CN 180
HM807046-HM807010 4t-inch 50.8 104.775 36.512 NTN open CN 153
4580-4535 4500 50.8 104.775 39.688 SKF open CN 195
537-532X 535 50.8 107.95 36.512 SKF open CN 183
537-532X-NTN 4t-inch 50.8 107.95 36.512 NTN open CN 157
HM907643-HM907614 4t-inch 50.8 111.125 30.162 NTN open CN 115
39575-39520 4t-inch 50.8 112.712 30.162 NTN open CN 153
3975-3920 4t-inch 50.8 112.712 30.162 NTN open CN 132
55200C-55443 4t-inch 50.8 112.712 30.162 NTN open CN 115
66200-66462 4t-inch 50.8 117.475 33.338 NTN open CN 144
619-612 4t-inch 50.8 120.65 41.275 NTN open CN 190
72200C-72487 4t-inch 50.8 123.825 36.512 NTN open CN 171
555-552A 4t-inch 50.8 123.825 38.1 NTN open CN 175

Exact-dimension interchange groups at 50.8 mm bore

These d×D×B envelopes at a 50.8 mm bore are shared by several series or brands — the starting point for a dimensional cross reference:

Selecting a 50.8 mm bore bearing

The bore fixes the shaft, not the bearing capacity. At 50.8 mm the catalog spans 82.55–123.825 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 50.8 mm bore?

This index lists 43 verified bearing models with a 50.8 mm (2.000 in) bore across 2 bearing types, from 82.55 to 123.825 mm outside diameter. Open any model for the full specification table, seal/clearance options and graded cross references.

How do I choose between the 82.55–123.825 mm OD options for a 50.8 mm shaft?

On a fixed 50.8 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 50.8 mm bearings?

A 50.8 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). Bore diameters below 20 mm follow the 10/12/15/17 mm exception table rather than code × 5.