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When a standard carbon-steel bearing fails in a wet, chemical, or food-adjacent environment, the entire assembly pays the price. Engineers, fabricators, and maintenance technicians who need a drop-in replacement that won't rust out within a season turn to stainless steel deep groove ball bearings — and that's exactly what this listing delivers.
This product covers a broad catalog of ZZ double-shielded deep groove ball bearings in two stainless steel grades: 440 (martensitic, higher hardness) and 304 (austenitic, superior corrosion resistance). Sizes span the 60x, 62x, 63x, 68x, 69x, 6000–6011, 6013–6014, 6200–6210, 6212, 6214, 6300–6312, 6800–6811, and 6900–6911 series, with bore diameters from 3 mm (≈ 0.118 in) up to 70 mm (≈ 2.756 in). Each bearing ships with pressed steel ZZ shields on both sides to retain grease and exclude light contamination.
Typical use cases include marine hardware and boat deck fittings where salt spray is constant, food processing conveyor lines requiring washdown-compatible components, laboratory and medical equipment where cleanliness standards prohibit carbon steel, and outdoor power tools and garden machinery exposed to moisture and mud. The wide size range also makes these bearings a reliable stock item for repair shops that service a variety of equipment.
| Bearing Type | Deep Groove Ball Bearing (ZZ Double-Shielded) |
|---|---|
| Material — Grade 1 | Stainless Steel 440 (Martensitic) |
| Material — Grade 2 | Stainless Steel 304 (Austenitic) |
| Shield Type | ZZ (Pressed Steel, Both Sides) |
| Bore Diameter Range | 3 mm – 70 mm (≈ 0.118 in – 2.756 in) |
| Outer Diameter Range | See variant options |
| Width Range | See variant options |
| Series Covered | 60x, 62x, 63x, 68x, 69x, 6000–6011, 6013, 6014, 6200–6210, 6212, 6214, 6300–6312, 6800–6811, 6900–6911 |
| Dimensional Standard | ISO 15 |
| Lubrication | Factory-packed grease (sealed, not re-greasable) |
| Operating Temperature | Typically –20 °C to +120 °C (–4 °F to +248 °F) |
| Quantity per Order | 1 piece per variant |
SS 440 is a martensitic stainless steel that can be hardened to approximately 58 HRC, giving it higher load capacity and wear resistance — making it the better choice for applications where mechanical stress is the primary concern. SS 304 is an austenitic grade with superior resistance to chlorides, acids, and oxidizing environments, making it preferable for marine, food processing, or chemical exposure scenarios where corrosion is the dominant threat. If you are unsure, SS 304 is generally the safer choice for wet or chemically aggressive environments.
The number follows ISO 15 conventions. The first digit(s) indicate the series (62xx = medium series, 63xx = heavy series, 68xx = thin section, etc.). The last two digits encode the bore: for sizes 04 and above, multiply by 5 to get the bore in mm (e.g., 05 → 25 mm). Sizes 00–03 correspond to 10, 12, 15, and 17 mm respectively. The ZZ suffix means double-shielded on both sides. Always cross-reference bore, OD, and width from the variant name before ordering.
Stainless steel 304 variants are widely used in food processing conveyor systems and equipment that undergoes regular washdown with water or mild cleaning agents. The stainless rings and balls resist surface rust that would otherwise contaminate product lines. However, the ZZ shields are pressed steel and may corrode over time in aggressive chemical environments. For full submersion or highly acidic/alkaline washdown, consider whether a rubber-sealed (2RS) variant or a higher-grade alloy is more appropriate for your specific conditions.
Yes. These bearings conform to ISO 15 dimensional standards, so the bore, outer diameter, and width are identical to carbon-steel equivalents with the same size code. They will fit the same housings and shafts. The only differences are material properties: stainless steel bearings have slightly lower maximum load ratings compared to through-hardened chrome steel (52100) bearings of the same size, but they offer significantly better corrosion resistance. Verify your load requirements before substituting in high-speed or heavy-load applications.
The series determines the relationship between bore and outer diameter. The 60x and 62x series are the most common general-purpose sizes. The 63x (heavy) series has a larger OD and width for the same bore, providing higher load capacity at the cost of more space. The 68x (thin section) series has a smaller OD and width, useful where radial space is limited. The 69x series sits between 68x and 60x in terms of cross-section. Match the series to your housing bore and available radial clearance — if you are replacing an existing bearing, use the same series designation.
These bearings are factory-packed with grease and sealed with ZZ pressed steel shields. The shields are not designed to be removed and replaced in the field, so these are effectively maintenance-free for their service life. The factory grease is suitable for typical operating temperatures of approximately –20 °C to +120 °C. If your application involves temperatures outside this range, high speeds, or aggressive media, contact us to confirm suitability before ordering.
Maximum speed depends on the specific size, lubrication, and load conditions. As a general reference, stainless steel deep groove ball bearings typically have a limiting speed 10–20% lower than equivalent chrome steel bearings due to the lower thermal conductivity of stainless steel. For exact speed ratings for a specific size, refer to the bearing manufacturer's catalog or contact us to confirm. For high-speed spindle or precision applications, please verify the specific variant's rated speed before purchasing.
