MPNbase

38 mm bore bearings

12 models with a 38 mm (1.496 in) bore across 3 bearing types, outside diameters from 43 to 63 mm. Tables are grouped by type; open a model for full specs and equivalents.

12 models 43–63 mm OD range 3 brands

Needle Roller Bearings (10)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
K38X43X17 K 38 43 17 SKF open CN 19.8
K38X46X32 K 38 46 32 SKF open CN 52.3
NK38-20 NK 38 48 20 SKF open CN 25.5
NK38-20-XL nk 38 48 20 FAG open CN 29
NK38-30 NK 38 48 30 SKF open CN 37.4
NK38-30-XL nk 38 48 30 FAG open CN 43
NKI38-20 NKI 38 53 20 SKF open CN 27.5
NKI38-20-XL nki 38 53 20 FAG open CN 30.5
NKI38-30 NKI 38 53 30 SKF open CN 40.2
NKI38-30-XL nki 38 53 30 FAG open CN 45.5

Support Rollers (1)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
RSTO30 rsto 38 62 19.8 FAG open CN 23.1

Tapered Roller Bearings (1)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
JL69349-JL69310 4t-inch 38 63 17 NTN open CN 43

Selecting a 38 mm bore bearing

The bore fixes the shaft, not the bearing capacity. At 38 mm the catalog spans 43–63 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 38 mm bore?

This index lists 12 verified bearing models with a 38 mm (1.496 in) bore across 3 bearing types, from 43 to 63 mm outside diameter. Open any model for the full specification table, seal/clearance options and graded cross references.

How do I choose between the 43–63 mm OD options for a 38 mm shaft?

On a fixed 38 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 38 mm bearings?

A 38 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.