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When your build demands reliable rotation in a compact footprint, undersized or mismatched bearings cause wobble, premature wear, and costly rework. Engineers, hobbyists, and repair technicians working on RC vehicles, 3D printers, drones, and precision instruments need bearings that fit exactly right and stay quiet under load. These miniature deep groove ball bearings — spanning the 693ZZ through 699ZZ series — are engineered for applications where every millimeter counts.
Each bearing in this series features a steel inner and outer ring with a full complement of hardened steel balls and double metal shields (ZZ) on both sides to retain grease and exclude contaminants. Bore diameters range from 3 mm (0.118 in) to 9 mm (0.354 in), with outer diameters from 8 mm (0.315 in) to 20 mm (0.787 in) and widths from 4 mm (0.157 in) to 6 mm (0.236 in), covering the most common miniature bearing sizes in a single product family.
Typical use cases include spindle assemblies in desktop CNC routers, idler pulleys in CoreXY 3D printers, motor shaft support in brushless drone motors, and wheel axles in 1/10-scale RC cars — all scenarios where a low-profile double-shielded miniature ball bearing for precision equipment delivers the smooth, low-friction rotation that keeps your project running at its best.
| Bearing Series | 693ZZ, 694ZZ, 695ZZ, 696ZZ, 697ZZ, 698ZZ, 699ZZ |
|---|---|
| Shield Type | Double metal shield (ZZ) — both sides |
| Bore Diameter (d) | 3 mm – 9 mm (0.118 in – 0.354 in) |
| Outer Diameter (D) | 8 mm – 20 mm (0.315 in – 0.787 in) |
| Width (B) | 4 mm – 6 mm (0.157 in – 0.236 in) |
| Ring Material | Bearing-grade hardened steel |
| Ball Material | Hardened steel |
| Cage Material | See variant options |
| Lubrication | Factory-applied grease (sealed by ZZ shields) |
| Radial Clearance | See variant options |
| Max Operating Speed | See variant options |
| Operating Temperature | Typically –10°C to +110°C (14°F to 230°F) |
| Available Pack Quantities | 1 pcs / 10 pcs / 50 pcs / 100 pcs / 300 pcs |
Match the bore diameter (d) to your shaft diameter and the outer diameter (D) to your housing bore. For example, if your shaft is 5 mm and your housing accepts a 13 mm OD, select the 695ZZ (5×13×4 mm). Always verify all three dimensions — bore, outer diameter, and width — before ordering, as a bearing that fits the shaft but not the housing will not seat correctly.
ZZ indicates double metal shields — one pressed-steel shield on each side of the bearing. The shields retain the factory grease inside the bearing and prevent external contaminants such as dust, metal filings, and light moisture from entering the ball track. ZZ bearings are non-contact shields, meaning they do not touch the inner ring, which keeps friction and running torque lower than rubber-sealed (2RS) bearings while still providing adequate protection for most indoor and light-duty outdoor applications.
Yes. The deep groove raceway geometry allows these bearings to carry both radial loads (perpendicular to the shaft) and moderate axial (thrust) loads in either direction. They are not designed for heavy axial-only applications — for those, angular contact or thrust bearings are more appropriate — but for typical combined-load scenarios in RC cars, 3D printers, and robotics, the deep groove design performs well.
These bearings are manufactured from standard bearing-grade steel, which offers moderate corrosion resistance when the ZZ shields keep moisture away from the balls and raceways. For occasional light moisture exposure, the factory grease provides a protective barrier. However, for continuous wet, submerged, or highly corrosive environments, stainless steel bearings (suffix SS or AISI 440C) are recommended instead. If you need stainless variants, please contact us to confirm availability.
For a single repair or prototype, the 1-piece pack lets you source exactly what you need without excess stock. The 10-piece pack suits small batch builds or keeping a few spares on hand. For production runs, workshop stock, or resale, the 50, 100, and 300-piece packs offer progressively lower per-unit cost. Select your size and quantity combination from the variant options above to see the exact price per pack.
Yes. The 693ZZ–699ZZ series covers the most common miniature bearing sizes used in 3D printers (such as 625ZZ-equivalent sizes for idler pulleys and extruder assemblies) and RC vehicles (wheel axle and drivetrain bearings). Always cross-reference the bore, outer diameter, and width against your specific printer or vehicle model's bearing specification before ordering to confirm fitment.
ZZ metal shields can be carefully removed with a thin pick or scribe to allow cleaning and re-lubrication, unlike rubber-sealed (2RS) bearings which are more difficult to re-seal. After cleaning with a suitable solvent and re-packing with bearing grease, the shields can be pressed back into the outer ring groove. This is practical for low-speed, high-contamination applications where periodic maintenance is part of the workflow.
