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When a standard carbon-steel bearing fails in a wet, dusty, or chemically exposed environment, the entire assembly pays the price. Engineers, makers, and maintenance professionals who need reliable rotation in demanding conditions turn to stainless steel double-shielded deep groove ball bearings — a drop-in upgrade that outlasts unshielded or carbon-steel alternatives without requiring lubrication changes or housing modifications.
Each stainless steel ZZ ball bearing consists of an inner ring, outer ring, stainless steel ball complement, and two pressed-steel shields (ZZ designation) — all manufactured from corrosion-resistant stainless steel. The bore (inner diameter) ranges from 2 mm to 75 mm and the outer diameter from 5 mm to 130 mm across the available series, covering miniature MR-series bearings (e.g., MR52zz 2×5×2.5 mm / 0.079″×0.197″×0.098″) through standard 6000-, 6200-, 6300-, 690x-, and 62xx-series frames up to 6312ZZ (60×130×31 mm / 2.362″×5.118″×1.220″).
Typical use cases include 3D printer carriage and extruder assemblies requiring miniature stainless bearings, food-processing conveyor rollers where washdown resistance is mandatory, marine hardware and RC boat drive shafts exposed to saltwater spray, and precision instrument pivots where low-profile MR-series bearings reduce overall package size. Long-tail search terms such as "stainless steel 608zz bearing replacement," "miniature MR84zz bearing for drone," and "6204ZZ corrosion-resistant bearing for pump" all map to sizes available in this listing.
Two pressed-steel shields on both sides retain grease and block contaminants — dust, fine particles, and light moisture splash — extending service intervals in dirty or damp environments.
Inner ring, outer ring, and ball complement are all stainless steel, providing corrosion resistance that carbon-steel bearings cannot match in humid, washdown, or mildly acidic conditions.
From miniature MR52zz (2×5×2.5 mm) to large-frame 6312ZZ (60×130×31 mm), covering MR, 60x, 62x, 63x, 68x, 69x, and 690x series — select the exact designation you need.
Deep groove geometry handles both radial and moderate axial (thrust) loads simultaneously, making these bearings suitable for motors, spindles, wheels, and conveyor rollers without a separate thrust bearing.
Each bearing arrives pre-packed with grease behind the shields. No additional lubrication is required before installation — mount and run immediately.
Available as a single piece (1 Pcs) for prototyping or repair, or as a 4-piece pack for production runs, spares kits, or multi-axis builds — choose the quantity that matches your project.
| Bearing Type | Deep Groove Ball Bearing, Double-Shielded (ZZ) |
|---|---|
| Material | Stainless Steel (rings, balls, shields) |
| Series Available | MR, 60x, 62x, 63x, 68x, 69x, 690x |
| Bore (ID) Range | 2 mm – 75 mm (0.079″ – 2.953″) |
| Outer Diameter Range | 5 mm – 130 mm (0.197″ – 5.118″) |
| Width Range | 2.5 mm – 31 mm (0.098″ – 1.220″) |
| Lubrication | Pre-greased (grease type: See variant options) |
| Operating Temperature | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Max Speed | See variant options |
| Dimensional Standard | ISO 15 / ABEC equivalent |
| Pack Options | 1 Pcs / 4 Pcs |
Match the bearing designation (e.g., 608zz, 6204ZZ, MR84zz) to your shaft diameter (bore/ID) and housing bore (OD). The designation is usually stamped on the bearing face or listed in your equipment's parts manual. If you only have the shaft diameter, cross-reference it with the ID column in a standard bearing table — for example, a 8 mm shaft typically uses a 608zz (8×22×7 mm) or 688zz (8×16×5 mm) depending on the housing space available.
Deep groove ball bearings handle moderate radial and axial loads. For light-to-medium duty applications — 3D printers, small motors, fans, conveyor rollers, RC vehicles, and hand tools — these bearings are well-suited. For heavy industrial loads or high-impact shock loads, consult the dynamic load rating (C) for your specific size and compare it to your application's requirements. Load ratings vary by size; contact us to confirm for your specific designation.
Stainless steel bearings resist rust and oxidation significantly better than standard carbon-steel bearings in humid, wet, or mildly corrosive environments. They are suitable for food-adjacent equipment, marine hardware, outdoor machinery, and washdown areas. Note that stainless steel is not fully immune to all chemicals — strong acids or chloride-rich environments may still cause surface degradation over time. For highly aggressive chemical exposure, consult a materials engineer.
"ZZ" indicates that the bearing has two metal shields — one on each side. These shields are pressed into grooves in the outer ring and sit close to (but do not contact) the inner ring, creating a labyrinth seal effect. They retain the factory grease and prevent coarse contaminants from entering the raceway. ZZ shields are not fully sealed like rubber-contact seals (2RS), so they are best suited for environments with dust and light moisture rather than full submersion.
Yes. Stainless steel ZZ bearings follow the same ISO dimensional standards as carbon-steel bearings of the same designation. A 6204ZZ stainless bearing has the same 20 mm bore, 47 mm OD, and 14 mm width as a standard 6204ZZ carbon-steel bearing, making it a direct drop-in replacement. No housing or shaft modification is required.
No. Each bearing is pre-greased at the factory before the shields are pressed in. You can install and run immediately. If your application involves very high temperatures, food-grade requirements, or extreme speeds, you may wish to re-grease with a specialty lubricant after removing the shields — but for most standard applications, the factory grease is sufficient for the bearing's service life.
Most FDM 3D printers use 608zz (8×22×7 mm) bearings for idler pulleys and carriage wheels — this is the same size as a standard skateboard bearing. Some compact or CoreXY designs use 688zz (8×16×5 mm) for tighter spaces. Check your printer's BOM (bill of materials) or measure the existing bearing's OD and width to confirm. Miniature MR-series bearings (MR84zz, MR85zz, etc.) are common in extruder pivot arms and small motor shafts.
