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When your build demands a bearing that fits where standard sizes simply won't go, engineers, robotics hobbyists, and precision-equipment builders turn to miniature flanged ball bearings. The flange lip locks the bearing axially in a housing bore without additional retaining hardware, eliminating a common source of misalignment in compact assemblies. These ZZ-type double-shielded flanged bearings are sized for applications where every millimeter counts.
Each bearing features a stamped steel flange ring integrated with a deep-groove raceway, available in inner diameters from 2mm to 8mm (approx. 0.079"–0.315") and outer diameters from 5mm to 14mm (approx. 0.197"–0.551"). Thickness options span 2.5mm, 3mm, 3.5mm, and 4mm. The ZZ designation indicates two metal shields — one on each side — that retain grease and block particulate ingress without the added drag of contact seals.
Typical use cases include 3D printer carriage axles and extruder idlers, RC car steering knuckles and differential outputs, miniature gearbox shafts in power tools, and precision jig fixtures in CNC setups where a flanged shoulder replaces a separate circlip groove. Available in packs of 1, 5, 10, 20, or 50 pieces to match prototype runs or production restocking needs.
| Bearing Type | Deep-Groove Flanged Ball Bearing, ZZ (Double Metal Shield) |
|---|---|
| Inner Diameter (ID) | 2mm – 8mm (approx. 0.079" – 0.315") — see variant options |
| Outer Diameter (OD) | 5mm – 14mm (approx. 0.197" – 0.551") — see variant options |
| Thickness | 2.5mm / 3mm / 3.5mm / 4mm — see variant options |
| Flange OD | See variant options / Contact us to confirm |
| Shield Type | Non-contact metal shields (ZZ), both sides |
| Lubrication | Factory-applied grease (sealed, not user-serviceable) |
| Load Direction | Radial primary; moderate axial (thrust) capacity |
| Material — Rings & Balls | See variant options / Contact us to confirm |
| Pack Quantity | 1 / 5 / 10 / 20 / 50 pcs — see variant options |
| Interchange Reference | F682ZZ, F683ZZ, F684ZZ, F685ZZ series (verify dimensions) |
Measure your shaft diameter with calipers — this becomes your inner diameter (ID). Then measure or check the drawing for your housing bore — this is your outer diameter (OD). Select the variant whose Inner Dia × Outer Dia matches those two measurements. The flange seats against the housing face, so the housing bore should match the listed OD, not the flange OD. If you are unsure, contact us with your shaft and housing dimensions.
ZZ indicates two non-contact metal shields, one on each side of the bearing. The shields do not touch the inner ring, so friction is lower than a rubber contact seal (2RS). The trade-off is that metal shields offer slightly less exclusion of very fine dust compared to a lip seal. For most hobby, robotics, and light-industrial applications operating in moderately clean environments, ZZ shields provide an effective balance of low drag and adequate contamination protection.
Standard ZZ flanged bearings use carbon steel rings and shields with grease lubrication. They are not rated for continuous water immersion or highly corrosive environments. For occasional moisture exposure, ensure the bearing is re-greased or protected after contact with water. If your application involves regular exposure to water, chemicals, or salt air, contact us to discuss stainless steel or ceramic hybrid options that may be available for your size range.
In 3D printers, the most common positions are linear rod end supports, extruder idler pulleys, and Z-axis lead screw thrust points. In RC cars, flanged miniature bearings appear in steering knuckle pivots, differential output shafts, and motor pinion supports. The flange is particularly useful because it prevents the bearing from being pushed through the housing under axial load, removing the need for a separate retaining clip.
Yes. Packs of 5, 10, 20, or 50 pieces offer a lower per-unit cost compared to the single-piece option. If you anticipate future maintenance, ordering a multi-pack now is a practical way to keep spares on hand. Unused bearings should be stored in a clean, dry location in their original packaging to preserve the factory grease and prevent corrosion on the shields.
The flange OD is larger than the listed bearing OD and varies by size. If your housing design requires a specific flange shoulder diameter or if you are replacing an existing bearing and need to match the flange step, contact us with the bearing size (Inner Dia × Outer Dia × Thickness) and we will provide the flange OD for that variant before you place your order.
Dynamic load ratings and speed limits vary by bearing size. As a general reference, miniature flanged bearings in the 2–8mm ID range are suited for low-to-medium speed applications — typically up to several thousand RPM depending on size and lubrication — and light radial loads. For applications requiring certified load data or speed ratings, contact us to confirm the specification sheet for your specific size variant.
