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When a worn or undersized bearing causes vibration, heat buildup, or premature shaft failure, finding an exact-fit replacement quickly matters. Engineers, maintenance technicians, and serious DIYers working on electric motors, power tools, bicycles, inline skates, and light industrial machinery need bearings that match precise dimensional tolerances without guesswork.
These deep groove ball bearings span models 6900 through 6906, covering inner diameters from 10 mm (0.39 in) to 30 mm (1.18 in), 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). Each bearing is available in two seal configurations: ZZ (metal shields on both sides) and 2RS (rubber contact seals on both sides), sold individually or in packs of 4, 10, or 20.
Typical use cases include replacing deep groove ball bearings in brushless DC motors and servo drives, restoring smooth rotation in skateboard and inline skate wheels, and servicing gearbox input shafts or conveyor idler rollers where a compact radial bearing with low friction is required.
| Bearing Series | 6900 / 6901 / 6902 / 6903 / 6904 / 6905 / 6906 |
|---|---|
| Seal Type | ZZ (metal shield, both sides) / 2RS (rubber contact seal, both sides) |
| 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 | Single-row deep groove ball bearing |
| Load Direction | Radial (primary) + moderate axial |
| Lubrication | Grease-filled (factory pre-lubricated) |
| Available Quantities | 1 pc / 4 pcs / 10 pcs / 20 pcs |
| Unit Weight | See variant options |
ZZ bearings use rigid metal shields that do not contact the inner ring, resulting in lower friction and suitability for higher rotational speeds (typically up to 20–30% faster than 2RS at equivalent loads). Choose ZZ when operating speed is the priority and contamination is limited to coarse particles. 2RS bearings use rubber lips that contact the inner ring, providing a tighter seal against fine dust, moisture, and grease loss. Choose 2RS for outdoor equipment, wet environments, or applications where grease retention over a long service interval is critical.
Measure three values: (1) shaft diameter — this must match the bearing inner diameter (ID) exactly; (2) housing bore — this must match the bearing outer diameter (OD) exactly; (3) available axial space — this must accommodate the bearing width. For example, if your shaft is 15 mm, your housing bore is 28 mm, and your axial space is at least 7 mm, you need a 6902 series bearing. Confirm all three dimensions before ordering to avoid fitment issues.
Deep groove ball bearings in the 6900–6906 series are widely used in small electric motors, brushless DC motors, and servo drives. ZZ variants are generally preferred for higher-speed motor applications due to lower seal drag. The specific speed limit depends on bearing size, lubrication, and operating temperature — consult the speed ratings for your selected model if operating above 10,000 RPM.
2RS variants offer better moisture resistance than ZZ due to their rubber contact seals, making them more appropriate for outdoor power tools, garden equipment, and applications exposed to light water splashing. Neither ZZ nor 2RS bearings are rated for full submersion. For heavily wet or corrosive environments, consider stainless steel or ceramic hybrid bearings instead.
Common indicators include: audible grinding, clicking, or rumbling noise during rotation; excessive radial play when the shaft is pushed side-to-side; visible rust, pitting, or discoloration on the bearing races or shields; and increased operating temperature at the bearing location. If any of these symptoms are present, replace the bearing promptly to prevent secondary damage to the shaft or housing.
Single-piece orders are suited for one-off repairs where you need an exact replacement. Multi-pack quantities (4, 10, or 20 pcs) are cost-effective for maintenance shops, production lines, or hobbyists who service multiple units of the same equipment. Stocking a small quantity of the most common sizes reduces downtime when a bearing fails unexpectedly. The per-unit price decreases as pack quantity increases.
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