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When a bearing fails mid-project — whether it's a seized motor shaft, a wobbling skateboard wheel, or a grinding conveyor roller — the root cause is almost always the wrong material or inadequate shielding. Engineers, makers, and maintenance technicians who work in wet, dusty, or chemically aggressive environments need a stainless steel ZZ deep groove ball bearing they can trust to stay in spec across thousands of operating hours.
These double-shielded deep groove ball bearings are manufactured from AISI 440C stainless steel for both the rings and rolling elements, with pressed steel ZZ shields on both faces. The catalog spans over 90 size variants — inner diameter (ID) from 2 mm (approx. 0.079 in) to 55 mm (approx. 2.165 in), outer diameter (OD) from 5 mm to 90 mm, and widths from 2.5 mm to 20 mm — covering miniature MR-series, 6xx-series, 68xx-series, 69xx, 62xx, 63xx, and 6800–6810 series designations.
Typical use cases include small DC and stepper motor shafts in robotics and CNC builds, inline skate and skateboard wheel axles requiring corrosion resistance, food-processing conveyor rollers where washdown cycles are routine, and marine or outdoor power-tool spindles exposed to salt spray. The ZZ shield keeps grease in and coarse particulates out without the added drag of a rubber seal, making these bearings well-suited for stainless steel ZZ bearing replacement in light-to-medium radial load applications.
| Bearing Type | Deep Groove Ball Bearing, Double-Shielded (ZZ) |
|---|---|
| Material — Rings & Balls | AISI 440C Stainless Steel |
| Shield Type | Pressed Steel (ZZ, non-contact) |
| Inner Diameter (ID) | 2 mm – 55 mm (see variant options) |
| Outer Diameter (OD) | 5 mm – 90 mm (see variant options) |
| Width / Thickness | 2.5 mm – 20 mm (see variant options) |
| Series Covered | MR, 6xx, 68xx, 69xx, 62xx, 63xx, 6800–6810 |
| Lubrication | Factory-packed grease (ZZ shields retain lubricant) |
| Load Direction | Radial (primary); light axial in both directions |
| Operating Temperature | See variant options |
| Tolerance Class | See variant options |
| Quantity per Order | 1 piece per variant selected |
Match the bearing's inner diameter (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. The width must fit within the available axial space in your assembly. All three dimensions — ID × OD × Thickness — are listed in the variant selector. If you are replacing an existing bearing, the size designation (e.g., 6202ZZ) is usually stamped on the outer ring and can be matched directly to the variant name.
ZZ designates pressed steel shields that sit close to but do not contact the inner ring. This non-contact design produces lower friction and allows higher rotational speeds compared to rubber-sealed (RS or 2RS) bearings. The trade-off is that ZZ shields are less effective at excluding very fine dust or liquids. For wet or heavily contaminated environments, a rubber-sealed variant would provide better ingress protection; for dry, higher-speed applications, ZZ is the preferred choice.
AISI 440C stainless steel offers significantly better resistance to oxidation and mild corrosion compared to chrome steel. This makes stainless ZZ bearings the correct choice for applications exposed to moisture, humidity, light chemicals, or washdown cycles — such as food equipment, marine hardware, outdoor power tools, and laboratory instruments. Chrome steel bearings are adequate for dry, indoor environments and typically offer a higher load rating at the same size, so choose based on your operating conditions.
Yes. The outer diameters conform to standard metric bearing dimensions, so these bearings are dimensionally interchangeable with other manufacturers' bearings of the same designation (e.g., 6202ZZ from any brand shares the same 15 × 35 × 11 mm envelope). No housing modification is required for a direct replacement. Always verify the exact ID, OD, and width against your housing drawing before ordering.
Deep groove ball bearings can accommodate light-to-moderate axial loads in both directions in addition to their primary radial load capacity. They are not designed for predominantly axial applications — for those, angular contact or thrust bearings are more appropriate. For typical DIY and light industrial uses such as motor shafts, wheel axles, and spindles, the axial capacity of these bearings is generally sufficient.
These bearings are factory-packed with grease and sealed by the ZZ shields, making them maintenance-free for most standard applications. The shields are not designed to be removed and re-fitted without risk of damage, so re-lubrication is not practical in the field. If your application involves extreme temperatures, very high speeds, or unusually heavy loads beyond the bearing's rated capacity, contact us to confirm suitability before ordering.
Look for a size designation stamped or engraved on the outer ring — it will typically read something like "6202 ZZ" or "MR104ZZ". Match that designation to the Sizes option in the variant selector. If the marking is worn, measure the shaft (ID), housing bore (OD), and available width with calipers, then select the variant whose ID × OD × Thickness matches your measurements. Contact us to confirm if you are unsure.
