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When your design leaves no room for a standard bearing but still demands reliable radial load capacity, engineers and DIY builders alike reach for thin-walled deep groove ball bearings. Whether you are rebuilding a servo motor, assembling a 3D printer carriage, or fabricating a custom robotic joint, finding a bearing that fits a narrow bore without sacrificing structural integrity is a constant challenge.
These stainless steel thin-walled deep groove ball bearings span two series — the 6800ZZ series (ID 10–55 mm / 0.39–2.17 in) and the 6900ZZ series (ID 10–55 mm / 0.39–2.17 in) — with outer diameters ranging from 19 mm to 80 mm (0.75–3.15 in) and widths from 5 mm to 13 mm (0.20–0.51 in). Each bearing features a double-shielded (ZZ) stainless steel construction with a full complement of precision-ground balls seated in a deep groove raceway.
Typical applications include miniature electric motors and spindles where axial space is constrained, RC vehicle wheel hubs and steering pivots requiring corrosion resistance, medical device actuators and laboratory instruments demanding low-friction rotation, and light-load conveyor rollers or guide wheels in food-processing or wet environments where stainless steel thin-walled bearings outperform standard carbon-steel alternatives.
Both sides sealed with metal shields to block contaminants and retain grease, reducing maintenance intervals in dusty or lightly moist environments.
Inner ring, outer ring, and shields are stainless steel, providing measurable corrosion resistance compared to standard chrome-steel bearings in humid or washdown-adjacent conditions.
Reduced cross-section (wall thickness typically 4–6 mm depending on series) allows installation in housings where standard-series bearings would not fit, without sacrificing radial load capacity for light-to-moderate duty cycles.
The deep groove geometry accommodates both radial and modest axial loads in either direction, making these bearings suitable for combined-load applications such as motor shafts and lead-screw supports.
From 6800ZZ (10 × 19 × 5 mm) to 6911ZZ (55 × 80 × 13 mm), covering the most common miniature and small-frame bearing bores in a single listing. Available in 1, 2, or 5-piece quantities.
Factory-applied grease fill behind the ZZ shields means these bearings can be pressed or slid into place and put into service immediately — no additional lubrication step required for standard duty use.
| Series | 6800ZZ, 6900ZZ |
|---|---|
| Bore (ID) Range | 10 mm – 55 mm (0.39 in – 2.17 in) |
| Outer Diameter (OD) Range | 19 mm – 80 mm (0.75 in – 3.15 in) |
| Width Range | 5 mm – 13 mm (0.20 in – 0.51 in) |
| Material | Stainless Steel (rings, shields) |
| Shield Type | Double-shielded (ZZ) |
| Bearing Type | Deep Groove Ball Bearing |
| Lubrication | Pre-greased (factory fill) |
| Load Direction | Radial + light axial (both directions) |
| Available Quantities | 1 Pcs, 2 Pcs, 5 Pcs |
| Exact Dimensions | See variant options |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
| Max RPM | Contact us to confirm |
Both series share the same bore sizes (10–55 mm), but the 6900ZZ series has a larger outer diameter and greater width for the same bore. For example, a 6800ZZ with a 10 mm bore measures 10 × 19 × 5 mm, while the 6900ZZ equivalent measures 10 × 22 × 6 mm. Choose the 6900ZZ when your housing allows a larger OD and you need slightly higher load capacity; choose the 6800ZZ when radial space is the primary constraint.
The stainless steel construction of the rings and ZZ shields provides meaningful corrosion resistance compared to standard chrome-steel bearings, making them appropriate for humid conditions, light splash exposure, and food-adjacent applications where occasional moisture contact is expected. They are not rated for full submersion or continuous water immersion — for those conditions, consider additional sealing or a fully sealed (2RS) variant.
ZZ bearings use non-contact metal shields that leave a small gap between the shield and the inner ring. This results in lower friction and higher speed capability, but allows fine particles or mist to enter over time. 2RS bearings use rubber contact seals that close that gap, offering better contamination exclusion at the cost of slightly higher drag. For most dry or lightly moist applications, ZZ is sufficient and preferred for speed-sensitive uses.
Deep groove ball bearings can accommodate modest axial loads in both directions in addition to their primary radial load capacity. However, thin-walled bearings have a reduced cross-section, so their axial load rating is lower than standard-series bearings of the same bore. For applications where axial load is the dominant force, an angular contact or thrust bearing is a more appropriate choice. For combined radial + light axial loads — such as motor shafts or lead screws — these bearings perform well.
No. These bearings are factory pre-greased behind the ZZ shields and are ready to install directly. For standard duty cycles and operating temperatures, no additional lubrication is required at installation. If you are operating at elevated temperatures, very high speeds, or in chemically aggressive environments, consult the grease compatibility specifications for your application before adding supplemental lubricant.
Use a digital caliper to measure three dimensions: (1) the bore (inner diameter, ID) — measure across the inner ring opening; (2) the outer diameter (OD) — measure across the widest point of the outer ring; (3) the width — measure the axial thickness of the bearing. Match these three values to the variant listed as ID × OD × Width. For example, if your caliper reads 20 mm bore, 32 mm OD, and 7 mm wide, select the 6804ZZ (20 × 32 × 7 mm) variant.
Each variant in this listing represents a specific size and quantity combination. To order multiple different sizes, add each size variant to your cart separately. If you need a large mixed assortment or have a bulk procurement requirement, contact us directly and we can discuss options.
