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When a standard bearing simply won't stay put, engineers and hobbyists turn to flanged miniature ball bearings. The integrated flange acts as a built-in shoulder stop, eliminating the need for separate retaining hardware and making these miniature flanged ball bearings ZZ the go-to choice for RC car builders, robotics designers, and precision instrument technicians who need reliable axial location in compact assemblies.
Each bearing in this series features a chrome steel or equivalent hardened steel inner and outer ring, a full complement of steel balls, and dual pressed-steel shields (ZZ) that retain grease and block contaminants without adding significant drag. Available models span inner diameters from 2 mm (approx. 0.079 in) to 9 mm (approx. 0.354 in), outer diameters from 5 mm to 26 mm, and widths from 2.3 mm to 8 mm — covering both standard F6-series and metric MF-series flange profiles.
Typical applications include 3D printer extruder idlers and carriage guides, brushless motor front-end support in drones and RC vehicles, miniature gearbox output shafts in robotics joints, and precision spindle support in optical and medical instruments. The flange shoulder makes press-fit installation into through-holes straightforward and repeatable, reducing assembly time on high-volume builds.
| Bearing Type | Flanged Deep Groove Ball Bearing, Double Steel Shield (ZZ) |
|---|---|
| Series | F6-series (F682 to F629) and MF-series (MF52 to MF148) |
| Inner Diameter (d) | 2 mm / 3 mm / 4 mm / 5 mm / 6 mm / 7 mm / 8 mm / 9 mm |
| Outer Diameter (D) | 5 mm – 26 mm (see variant options) |
| Width (B) | 2.3 mm – 8 mm (see variant options) |
| Shield Type | ZZ — Pressed steel, both sides |
| Lubrication | Grease-packed (factory applied) |
| Material — Rings & Balls | Hardened steel |
| Flange | Integrated, same material as outer ring |
| Operating Temperature | Typically –10°C to +120°C (14°F to 248°F) |
| Available Quantities | 1 / 3 / 5 / 10 pcs per order |
| Model Selection | See variant options |
Match the three key dimensions to your housing drawing: inner diameter (d), outer diameter (D), and width (B). These are listed in each variant name in the format d×D×B mm — for example, F683-ZZ (3×7×3mm) has a 3 mm bore, 7 mm OD, and 3 mm width. Measure your existing bearing or housing bore with calipers before ordering. If you are replacing a worn bearing, the model number is often stamped on the outer ring shield.
Both series are flanged miniature ball bearings with ZZ steel shields. The F6-series (e.g., F682, F683) follows one set of standard outer-diameter and width conventions, while the MF-series (e.g., MF52, MF63, MF84) follows a slightly different metric flanged standard — typically with a smaller outer diameter relative to bore size. Always verify the exact d×D×B dimensions in the variant name rather than relying on the series prefix alone when selecting a replacement.
These bearings are designed for light-load, moderate-speed applications typical of RC vehicles, 3D printers, robotics joints, and small servo mechanisms. For very high-speed brushless motor front ends (above approximately 20,000 RPM), consult the specific speed rating for your chosen model size. Smaller bore sizes generally support higher speeds due to lower centrifugal ball loading. The ZZ grease-packed shields are appropriate for most hobby and light industrial duty cycles.
Press or slide the bearing into the housing bore until the flange seats flush against the housing face — the flange acts as the axial stop and should not be forced past the housing surface. Apply press force only to the outer ring when pressing into a housing, and only to the inner ring when pressing onto a shaft. Never press through the balls or shields. For light interference fits, a bearing press tool or a flat punch of appropriate diameter is recommended to avoid cocking the bearing during installation.
No additional lubrication is required before initial use — each bearing is factory-packed with grease behind the ZZ steel shields. For extended service life in continuous-duty applications, re-lubrication is possible by carefully removing one shield, applying a small amount of compatible bearing grease, and re-seating the shield. In most hobby and light-duty applications, the factory grease charge is sufficient for the bearing's service life.
The standard ZZ steel shields and hardened steel rings provide basic protection against light dust and splash, but these bearings are not rated for continuous water immersion or exposure to corrosive chemicals. For wet environments such as underwater ROVs or marine applications, consider stainless steel or ceramic hybrid bearings instead. In moderately humid conditions, the grease-packed ZZ shields offer reasonable protection for intermittent use.
For prototyping or single-unit repairs, the 1-piece option lets you verify fit before committing to larger quantities. The 3-piece and 5-piece packs offer a moderate per-unit saving and are well-suited for small batch builds or keeping spares on hand. The 10-piece pack provides the best per-unit value and is recommended for production runs, classroom kits, or stocking commonly used sizes. All quantity options ship the same bearing model — only the count and price differ.
