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When a seized or noisy bearing brings a motor, RC drivetrain, or precision instrument to a halt, finding the exact replacement quickly matters. These micro deep groove ball bearings cover the 683 through 689 series, giving engineers, hobbyists, and repair technicians a single source for the most common miniature bearing sizes.
Each bearing is constructed from steel with a deep groove raceway geometry. Available sizes span from 3×7×3 mm (0.118″×0.276″×0.118″) for the 683 up to 9×17×5 mm (0.354″×0.669″×0.197″) for the 689. Select your required inner diameter, outer diameter, and thickness from the variant options above.
Typical applications include brushless and brushed DC motors, 3D printer extruder and axis assemblies, RC car and drone drivetrains, small gearboxes, and handheld power tools — anywhere a compact, low-friction radial bearing is needed to replace a worn micro bearing or complete a new build.
The deep groove profile handles both radial and moderate axial loads, making these bearings suitable for high-speed motor shafts and oscillating mechanisms.
Steel races and balls deliver the dimensional stability and load capacity required in motors, gearboxes, and precision instruments.
Inner diameters from 3 mm to 9 mm and outer diameters from 7 mm to 17 mm cover the most common miniature bearing footprints in a single listing.
Precision-ground raceways reduce drag, supporting efficient operation in brushless motors, spindles, and other speed-sensitive assemblies.
Dimensions conform to standard 6xx-series micro bearing specifications, allowing direct substitution without housing modification in most applications.
Order 1, 2, 5, 10, 20, or 50 pieces per variant to match a single repair job, a production run, or a workshop stock requirement.
| Bearing Series | 683, 684, 685, 686, 687, 688, 689 |
|---|---|
| Inner Diameter (ID) | 3 mm – 9 mm (0.118″ – 0.354″) — See variant options |
| Outer Diameter (OD) | 7 mm – 17 mm (0.276″ – 0.669″) — See variant options |
| Width (Thickness) | 3 mm – 5 mm (0.118″ – 0.197″) — See variant options |
| Bearing Type | Deep Groove Ball Bearing |
| Material | Steel |
| Seal / Shield | See variant options |
| Load Direction | Radial + moderate axial |
| Available Quantities | 1, 2, 5, 10, 20, 50 Pcs |
Measure the shaft diameter (inner diameter), the housing bore (outer diameter), and the available axial space (width/thickness). Match those three dimensions to the variant options — for example, a 5 mm shaft in a 11 mm housing with 5 mm of axial space calls for the 685 (5×11×5 mm).
Each number designates a specific set of dimensions. The 683 is the smallest at 3×7×3 mm and the 689 is the largest at 9×17×5 mm. The number itself is an industry-standard designation — any bearing labeled 683 from any manufacturer shares the same bore, OD, and width.
Yes. Deep groove ball bearings are the standard choice for high-speed radial applications such as brushless DC motors, spindle motors, and cooling fans. The steel construction and precision-ground raceways support the rotational speeds typical of these applications.
Deep groove ball bearings can accommodate moderate axial loads in addition to radial loads. For applications where axial loading is the primary force, a dedicated thrust bearing is more appropriate. For mixed radial and light axial loads — common in motors and gearboxes — these bearings are well suited.
Standard steel bearings offer moderate corrosion resistance suitable for indoor and dry environments. For wet, humid, or chemically exposed environments, consider stainless steel variants. Contact us to confirm material options if corrosion resistance is a critical requirement.
For a single repair, the 1 or 2 Pcs option is the most economical. Workshop stock or small production runs typically benefit from the 10 or 20 Pcs packs. For larger production volumes, the 50 Pcs pack offers the best per-unit value. Select the quantity from the Amount variant above.
Common signs include audible grinding or clicking during rotation, increased drag or resistance when spinning the shaft by hand, visible pitting or discoloration on the races or balls, and excessive radial play when the shaft is wiggled. Any of these symptoms indicate the bearing should be replaced before further damage occurs to the surrounding assembly.
