37 mm bore bearings
8 models with a 37 mm (1.457 in) bore across 1 bearing type, outside diameters from 42 to 52 mm. Tables are grouped by type; open a model for full specs and equivalents.
8 models 42–52 mm OD range 2 brands
| Model | Series | d (mm) | D (mm) | B (mm) | Brand | Seal | Clearance | C (kN) |
|---|---|---|---|---|---|---|---|---|
| K37X42X17 | K | 37 | 42 | 17 | SKF | open | CN | 21.6 |
| NK37-20 | NK | 37 | 47 | 20 | SKF | open | CN | 25.1 |
| NK37-20-D-XL | nk | 37 | 47 | 20 | FAG | open | CN | 34 |
| NK37-20-XL | nk | 37 | 47 | 20 | FAG | open | CN | 28 |
| NK37-30 | NK | 37 | 47 | 30 | SKF | open | CN | 36.9 |
| NK37-30-XL | nk | 37 | 47 | 30 | FAG | open | CN | 42 |
| NKS37 | NKS | 37 | 52 | 22 | SKF | open | CN | 36.9 |
| NKS37-XL | nks | 37 | 52 | 22 | FAG | open | CN | 41.5 |
Exact-dimension interchange groups at 37 mm bore
These d×D×B envelopes at a 37 mm bore are shared by several series or brands — the starting point for a dimensional cross reference:
Selecting a 37 mm bore bearing
The bore fixes the shaft, not the bearing capacity. At 37 mm the catalog spans 42–52 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 37 mm bore?
This index lists 8 verified bearing models with a 37 mm (1.457 in) bore across 1 bearing type, from 42 to 52 mm outside diameter. Open any model for the full specification table, seal/clearance options and graded cross references.
How do I choose between the 42–52 mm OD options for a 37 mm shaft?
On a fixed 37 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 37 mm bearings?
A 37 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.