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When a worn or contaminated bearing causes premature failure in a motor, bicycle hub, or small machine, finding a correctly sized replacement with dependable sealing is the priority. These 6900–6906 2RS deep groove ball bearings are designed for engineers, mechanics, and serious DIYers who need a drop-in replacement or upgrade that holds up under continuous rotation and light axial loads.
Each bearing is manufactured from GCR15 bearing steel — a high-carbon chromium alloy widely used in precision rolling elements — and features double rubber seals (2RS) on both faces. Available models span inner diameters from 10 mm (0.39 in) to 30 mm (1.18 in), with outer diameters from 22 mm (0.87 in) to 47 mm (1.85 in) and widths of 6–9 mm (0.24–0.35 in). Sold in quantities of 1, 3, 5, or 10 pieces per order.
Typical applications include bicycle bottom brackets and wheel hubs, small electric motor end shields, RC car and drone drivetrains, skateboard and inline skate axles, and light industrial conveyor rollers. The 2RS seal profile makes these bearings well suited for environments where dust, moisture, or light lubricant contamination is a concern.
Made from GCR15 high-carbon chromium steel, a standard alloy for precision rolling-element bearings offering good hardness, wear resistance, and fatigue life under cyclic loading.
Both faces are fitted with contact rubber seals that block dust and moisture ingress while retaining factory grease, reducing the need for external re-lubrication in most applications.
Choose from 6900 through 6906 — inner diameters 10 mm to 30 mm — so you can match the exact bore and housing dimensions of your assembly without sourcing from multiple suppliers.
The deep groove geometry handles both radial and moderate axial loads in either direction, making these bearings versatile across rotating shaft applications from power tools to hobby equipment.
Order 1, 3, 5, or 10 pieces per variant to match your project scale — single-unit replacement or multi-unit stock for workshop or production use.
Each bearing arrives pre-greased behind the rubber seals. No additional lubrication is required before installation in standard-duty applications.
| Bearing Series | 6900 / 6901 / 6902 / 6903 / 6904 / 6905 / 6906 |
|---|---|
| Seal Type | 2RS (Double Rubber Seal, both sides) |
| Material | GCR15 High-Carbon Chromium Bearing Steel |
| Inner Diameter (ID) | 10 mm / 12 mm / 15 mm / 17 mm / 20 mm / 25 mm / 30 mm |
| Outer Diameter (OD) | 22 mm / 24 mm / 28 mm / 30 mm / 37 mm / 42 mm / 47 mm |
| Width | 6 mm / 6 mm / 7 mm / 7 mm / 9 mm / 9 mm / 9 mm |
| Bearing Type | Deep Groove Ball Bearing |
| Lubrication | Pre-greased (factory-filled) |
| Load Direction | Radial + moderate axial (both directions) |
| Pack Quantity Options | 1 pcs / 3 pcs / 5 pcs / 10 pcs |
| Operating Temperature | See variant options |
| Tolerance Grade | See variant options |
Match the bearing model to your shaft's inner diameter (bore). The 6900 fits a 10 mm shaft, 6901 fits 12 mm, 6902 fits 15 mm, 6903 fits 17 mm, 6904 fits 20 mm, 6905 fits 25 mm, and 6906 fits 30 mm. Also confirm the outer diameter and width match your housing before ordering — all three dimensions are listed in the variant name (ID×OD×Width).
"2RS" stands for double rubber sealed — both sides of the bearing have a contact rubber seal. This keeps factory grease inside the bearing and blocks dust and light moisture from entering the raceway. It is the preferred choice over open or single-shielded bearings in most DIY, bicycle, and light machinery applications where contamination is a concern.
GCR15 bearing steel provides good wear resistance but is not stainless. The 2RS rubber seals offer protection against light moisture and splash, but these bearings are not rated for continuous immersion or highly corrosive environments. For marine or chemical-exposure applications, consider stainless steel bearings instead.
Yes. The 6900–6906 series follows ISO 15 dimensional standards, so these bearings are dimensionally interchangeable with same-model bearings from other manufacturers. As long as the model number (e.g., 6902-2RS) and dimensions match your application, they will fit the same housing and shaft.
No. Each bearing is pre-greased at the factory and sealed on both sides. For standard-duty applications — motors, bicycles, skates, small machines — no additional lubrication is needed before installation. Avoid washing out the factory grease with solvents during installation.
For a single repair or replacement, the 1 pcs option is the most cost-effective. If you are servicing multiple units or want spares on hand, the 3 pcs or 5 pcs packs offer a lower per-unit cost. The 10 pcs pack is suited for workshop stock or small production runs where you need consistent availability.
