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When a worn or undersized bearing causes vibration, heat buildup, or premature shaft failure, engineers and maintenance technicians need a dimensionally accurate replacement they can trust. These 6811ZZ through 6820ZZ deep groove ball bearings are designed for demanding radial and moderate axial load applications where consistent rotational accuracy matters.
Each bearing features a chrome steel (GCr15) inner and outer ring with a full complement of precision steel balls and double-shielded (ZZ) metal covers to retain grease and exclude contaminants. Bore diameters range from 55 mm (2.165 in) to 100 mm (3.937 in), with outer diameters from 72 mm (2.835 in) to 125 mm (4.921 in) and widths of 9–13 mm (0.354–0.512 in).
Typical applications include electric motor spindles, gearbox input shafts, conveyor drive rollers, agricultural machinery pivot points, and light industrial automation equipment where a deep groove ball bearing for electric motors or a replacement gearbox bearing is required.
| Bearing Series | 6811ZZ, 6812ZZ, 6813ZZ, 6814ZZ, 6815ZZ, 6816ZZ, 6817ZZ, 6818ZZ, 6819ZZ, 6820ZZ |
|---|---|
| Bore Diameter (d) | 55 mm – 100 mm (2.165 in – 3.937 in) |
| Outer Diameter (D) | 72 mm – 125 mm (2.835 in – 4.921 in) |
| Width (B) | 9 mm – 13 mm (0.354 in – 0.512 in) |
| Seal Type | ZZ (Double Metal Shield, both sides) |
| Material | Chrome Steel (GCr15) |
| Lubrication | Factory-greased (grease pre-filled) |
| Dimensional Standard | ISO 15 / DIN 625 |
| Radial Load Capacity | See variant options |
| Max Operating Speed | See variant options |
| Operating Temperature | Typically –20°C to +120°C (–4°F to +248°F) |
| Available Quantities | 1 pcs, 5 pcs, 10 pcs |
Match the bearing designation to your shaft diameter: 6811ZZ fits a 55 mm shaft, 6812ZZ fits 60 mm, 6813ZZ fits 65 mm, and so on up to 6820ZZ for a 100 mm shaft. Verify the outer diameter and width against your housing bore and available axial space before ordering. The variant selector above lists all dimensions in the format bore × OD × width (mm).
Deep groove ball bearings are designed primarily for radial loads but can also carry moderate axial (thrust) loads in both directions. The exact dynamic and static load ratings vary by size — consult the bearing designation datasheet for your specific model. For heavy axial or combined loads, consider pairing with a thrust bearing or angular contact bearing.
The ZZ metal shields on these bearings are snap-fit and can be carefully removed with a thin tool for re-lubrication in low-contamination environments. However, for most applications the factory grease fill is sufficient for the bearing's service life. Re-shielding after re-greasing is recommended to maintain contamination protection.
Chrome steel (GCr15) bearings offer moderate corrosion resistance when the ZZ shields keep moisture away from the raceways. For consistently wet, washdown, or outdoor environments, consider stainless steel bearings or apply a compatible corrosion-inhibiting grease. The ZZ shields help, but they are not fully sealed against liquid ingress under pressure.
Yes. These bearings conform to ISO 15 / DIN 625 dimensional standards, making them dimensionally interchangeable with any 6811ZZ through 6820ZZ bearing from other manufacturers. Always verify the bore, outer diameter, and width match your application before installation.
Order 1 pcs for a single repair or to verify fitment before a larger purchase. Choose 5 pcs or 10 pcs for planned maintenance kits, production line stock, or when replacing multiple bearings in the same machine — the per-unit cost decreases with larger quantities. Contact us if you need quantities beyond 10 pcs.
