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When a seized bearing brings your project to a halt — whether it is a skateboard truck, a small motor shaft, or a custom CNC axis — you need a drop-in replacement that fits exactly and runs quietly from the first spin. These 6900Z–6910Z series deep groove ball bearings are sized for makers, repair technicians, and mechanical engineers who demand dimensional accuracy and consistent radial load performance across a range of bore sizes.
This listing covers the full 6900–6910 size range in three material grades: bearing steel (chrome steel, GCr15), 304 stainless steel, and 440 stainless steel. Bore (ID) runs from 10 mm (0.394 in) to 50 mm (1.969 in); outer diameter (OD) from 22 mm (0.866 in) to 72 mm (2.835 in); width from 6 mm to 12 mm. Shield options include Z (single metal shield) and RS (rubber-sealed, contact seal). Available in packs of 1, 5, or 10 pieces.
Typical applications include hobby robotics and RC drivetrain rebuilds requiring 6901Z or 6902Z bearings, light industrial spindle and conveyor roller replacements using 6905Z–6907Z, and marine or food-adjacent equipment where 440 stainless 6900Z–6910Z bearings resist moisture and mild corrosion without lubrication re-packing.
Covers 6900Z through 6910Z — bore sizes 10 mm to 50 mm — so you can source multiple shaft sizes without switching suppliers.
Z (metal shield) suits dry, low-contamination environments; RS (rubber contact seal) retains grease and blocks dust and light moisture for longer service intervals.
Bearing steel (GCr15) for standard mechanical loads; 304 stainless for general corrosion resistance; 440 stainless for higher hardness and improved wear resistance in wet or mildly corrosive conditions.
Order 1 piece for a single repair, 5 for a small batch build, or 10 for workshop stock — pricing scales with quantity.
Handles radial loads as primary function and accommodates moderate axial (thrust) loads in both directions — suitable for motors, spindles, and rotating shafts.
Manufactured to standard 6900-series dimensional tolerances (ID, OD, width) for direct interchange with OEM and aftermarket housings without machining.
| Bearing Series | 6900Z – 6910Z (deep groove ball bearing) |
|---|---|
| Material Options | Bearing Steel (GCr15) / 304 Stainless Steel / 440 Stainless Steel |
| Bore (ID) Range | 10 mm – 50 mm (0.394 in – 1.969 in) |
| Outer Diameter (OD) Range | 22 mm – 72 mm (0.866 in – 2.835 in) |
| Width Range | 6 mm – 12 mm |
| Shield / Seal Type | Z (metal shield, one side) or RS (rubber contact seal, one side) |
| Lubrication | Grease-packed (factory pre-lubricated) |
| Load Type | Radial (primary); moderate axial (both directions) |
| Pack Quantity Options | 1 pc / 5 pcs / 10 pcs |
| Operating Temperature | See variant options |
| Radial Clearance | See variant options |
Z-shielded bearings use a non-contact metal shield on one side. They run at slightly lower friction and tolerate higher speeds, but offer less protection against fine dust or moisture. RS-sealed bearings use a rubber contact seal that retains grease more effectively and blocks contamination — a better choice for dusty workshops, outdoor equipment, or applications with occasional moisture exposure. If in doubt and speed is not the limiting factor, choose RS.
Bearing steel (GCr15 / chrome steel) offers the highest hardness and load capacity for standard dry or lightly lubricated mechanical environments. 304 stainless provides good corrosion resistance for general wet or humid conditions but is softer than bearing steel. 440 stainless combines improved hardness with corrosion resistance — it is the preferred choice when both wear resistance and moisture exposure are concerns, such as in marine hardware or food-processing adjacent equipment.
Measure three dimensions on your existing bearing or housing: bore (inner diameter / ID), outer diameter (OD), and width. Match these to the variant name — for example, "6902Z 15*28*7" means ID 15 mm, OD 28 mm, width 7 mm. If you are replacing a bearing, the size code is usually stamped on the outer ring. Cross-reference the number against the 6900-series standard to confirm.
Deep groove ball bearings are primarily designed for radial loads. They can accommodate moderate axial loads in both directions as a secondary function — sufficient for most motor shafts, spindles, and light conveyor applications. For applications where axial load is the dominant force, a dedicated thrust bearing or angular contact bearing is more appropriate.
Both stainless grades offer corrosion resistance superior to bearing steel. 440 stainless is harder and more wear-resistant, making it the stronger choice for salt-spray or continuously wet environments. 304 stainless is adequate for intermittent moisture and general outdoor conditions. Neither grade is fully immune to corrosion in prolonged saltwater immersion — inspect and re-lubricate periodically in harsh environments.
For a single repair or prototype build, the 1-piece option lets you source exactly what you need without excess. The 5-piece pack suits small batch production runs or situations where you want one spare on hand. The 10-piece pack is cost-effective for workshop stock, recurring maintenance schedules, or small-volume manufacturing where downtime from a missing bearing is costly.
Speed ratings vary by size, material, and seal type. Smaller bearings (6900–6902 series) generally support higher RPM than larger ones (6908–6910). Metal-shielded (Z) variants typically allow higher speeds than rubber-sealed (RS) variants due to lower seal friction. For specific speed limits by size and material, contact us to confirm before use in high-speed spindle or motor applications.
