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4 mm bore bearings

16 models with a 4 mm (0.157 in) bore across 3 bearing types, outside diameters from 7 to 16 mm. Tables are grouped by type; open a model for full specs and equivalents.

16 models 7–16 mm OD range 2 brands

Deep Groove Ball Bearings (11)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
W627-4-ZZ 6200 4 7 2.5 SKF ZZ CN 0.143
W618-4 61800 4 9 2.5 SKF open CN 0.364
W638-4-ZZ 63800 4 9 4 SKF ZZ CN 0.364
W619-4-ZZ 61900 4 11 4 SKF ZZ CN 0.54
W604 6000 4 12 4 SKF open CN 0.54
W604-2RS 6000 4 12 4 SKF 2RS CN 0.54
W604-ZZ 6000 4 12 4 SKF ZZ CN 0.54
W624-2RS 6200 4 13 5 SKF 2RS CN 0.741
W624-ZZ 6200 4 13 5 SKF ZZ CN 0.741
W634-2RS 6300 4 16 5 SKF 2RS CN 0.761
W634-ZZ 6300 4 16 5 SKF ZZ CN 0.761

Needle Roller Bearings (4)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
K4X7X7-TN K 4 7 7 SKF open CN 1.72
K4X7X10-TN K 4 7 10 SKF open CN 2.29
HK0408 HK 4 8 8 SKF open CN 1.76
HK0408FT2 HK 4 8 8 NTN open — 1.77

Needle Roller Thrust Bearings (1)

Model Series d (mm) D (mm) B (mm) Brand Seal Clearance C (kN)
AXK0414-TN AXK 4 14 2 SKF open CN 4.15

Exact-dimension interchange groups at 4 mm bore

These d×D×B envelopes at a 4 mm bore are shared by several series or brands — the starting point for a dimensional cross reference:

Selecting a 4 mm bore bearing

The bore fixes the shaft, not the bearing capacity. At 4 mm the catalog spans 7–16 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 j5 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 4 mm bore?

This index lists 16 verified bearing models with a 4 mm (0.157 in) bore across 3 bearing types, from 7 to 16 mm outside diameter. Open any model for the full specification table, seal/clearance options and graded cross references.

How do I choose between the 7–16 mm OD options for a 4 mm shaft?

On a fixed 4 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 4 mm bearings?

A 4 mm bore on a rotating inner ring normally uses a j5 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.