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When your build demands a bearing that fits where standard sizes simply won't, engineers and makers turn to NMB miniature deep groove ball bearings ZZ. Whether you're repairing a brushless motor, upgrading a 3D printer carriage, or sourcing replacement rolling elements for precision instruments, finding the right bore-to-OD ratio in a double-shielded format is often the bottleneck. These bearings are stocked across 26 size variants to eliminate that wait.
Each bearing features a chrome steel raceway with ZZ double metal shields on both faces, sealing the internal grease fill against dust and light moisture ingress. Inner diameters span 2–9 mm (0.079–0.354 in), outer diameters 6–24 mm (0.236–0.945 in), and widths 2.5–8 mm (0.098–0.315 in), covering the full NMB miniature series including 6xx, MR-series, and R-series designations. Available in single-piece or 10-piece packs.
Typical applications include RC car and drone drivetrains requiring NMB miniature ZZ replacement bearings, CNC spindle and linear axis support where low-profile deep groove ball bearings reduce assembly height, and medical or optical instrument pivots where consistent ABEC-grade tolerances matter. The double-shield construction makes these equally suited to 3D printer extruder idlers and small servo mechanisms exposed to particulate environments.
Covers 695ZZ through R-2280ZZ — ID 2–9 mm, OD 6–24 mm, width 2.5–8 mm — so you can match exact shaft and housing dimensions without sourcing from multiple suppliers.
Both faces are enclosed by pressed-steel shields that retain factory grease and block particulate ingress, extending service intervals in dusty or high-vibration environments.
Hardened chrome steel inner and outer rings deliver consistent radial load capacity and dimensional stability across the operating temperature range typical of motors and precision drives.
The deep raceway profile accommodates both radial and moderate axial loads in a single compact unit, reducing the need for separate thrust elements in space-constrained assemblies.
Each bearing ships with a factory grease fill suited to general-purpose speeds. No additional lubrication is required for most RC, robotics, and instrument applications at installation.
Order one bearing for a targeted repair or a 10-pack for production runs and spares inventory — both options are available for every size variant in this listing.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Shield Type | ZZ (Double Metal Shield, Both Sides) |
| Inner Diameter (ID) Range | 2–9 mm (0.079–0.354 in) |
| Outer Diameter (OD) Range | 6–24 mm (0.236–0.945 in) |
| Width Range | 2.5–8 mm (0.098–0.315 in) |
| Material | Chrome Steel (GCr15) |
| Lubrication | Factory Grease (Pre-filled) |
| Series Covered | 6xx, MR-series, R-series (NMB Miniature) |
| Load Direction | Radial + Moderate Axial |
| Available Quantities | 1 pcs / 10 pcs per order |
| Exact Size per Variant | See variant options |
| Operating Temperature | Contact us to confirm |
Match three dimensions: inner diameter (ID) to your shaft diameter, outer diameter (OD) to your housing bore, and width to the available axial space. All three values are listed in the variant name in the format ID×OD×width (mm). Measure your existing bearing with calipers before ordering if you are replacing a worn part.
ZZ bearings use pressed-steel shields on both faces. The shields are non-contact, meaning there is a small gap between the shield edge and the inner ring — this allows higher rotational speeds with lower friction but provides less protection against fine dust or moisture compared to rubber-contact seals (2RS). ZZ is preferred for high-speed motors and clean environments; 2RS suits slower, wetter, or dirtier conditions.
Yes. Chrome steel bearings seat correctly in aluminum housings and on stainless steel shafts provided the fit tolerances (typically h6 shaft / H7 housing for light press fits) are respected. Avoid mixing dissimilar metals in corrosive environments without additional protective measures, as galvanic effects can accelerate wear at the interface.
No. Each bearing arrives pre-greased from the factory. Adding extra lubricant to a ZZ-shielded bearing is not recommended — overfilling can cause the shields to deform or the grease to churn, increasing operating temperature. If your application requires a specific lubricant type (e.g., food-grade or high-temperature grease), contact us before ordering.
Dynamic and static load ratings vary by size. Smaller variants such as 692ZZ (2×6×3 mm) are suited to very light radial loads under 50 N, while larger variants such as 628ZZ (8×24×8 mm) can handle several hundred newtons radially. For exact C and C0 values, refer to the NMB bearing catalog for the specific part number or contact us to confirm suitability for your load case.
Yes — these are among the most common applications for NMB miniature ZZ bearings. They are widely used in 3D printer extruder idlers (typically 695ZZ or 686ZZ), RC car differential and wheel hubs, drone motor bell housings, and small servo pivots. Select the variant whose ID matches your shaft and whose OD fits your housing or printed bracket.
Maximum speed depends on bearing size, lubrication, and load. As a general guide, miniature ZZ bearings in this size range are rated for reference speeds typically between 20,000–60,000 RPM for the smallest variants and 10,000–30,000 RPM for the larger ones. Consult the NMB datasheet for your specific part number or contact us to confirm speed suitability for your motor or spindle application.
