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When a worn or undersized bearing causes vibration, noise, or premature shaft failure, the fix starts with choosing the right sealed unit. Engineers, maintenance technicians, and hands-on builders who need a reliable drop-in replacement for motors, pumps, conveyors, or hobby equipment rely on deep groove ball bearings that hold tolerance under load and resist contamination from day one.
These deep groove ball bearings are available in the 690x Z/RS series (inner diameter 10–35 mm / 0.39–1.38 in) and the 600x 2RS/ZZ series (inner diameter 10–40 mm / 0.39–1.57 in), covering a combined thickness range of 6–15 mm (0.24–0.59 in). The Z and ZZ suffix denotes a single or double metal shield; RS and 2RS denote single or double rubber contact seals. Chrome steel (GCr15) construction is standard across the range, with raceways ground to ABEC-3 equivalent tolerances.
Typical applications include electric motor front and rear end-shields, skateboard and inline skate axles, 3D printer carriage rails, small agricultural equipment, and light conveyor drive shafts — anywhere a compact, sealed deep groove ball bearing must handle radial loads with minimal maintenance. The multi-pack options (1, 2, 5, or 10 pieces) make it straightforward to stock spares or complete a full rebuild in one order.
| Series | 690x (6900–6907) & 600x (6000–6008) |
|---|---|
| Seal Type | Z / ZZ (metal shield) · RS / 2RS (rubber contact seal) |
| Inner Diameter (Bore) | 10 mm – 40 mm (0.39 in – 1.57 in) |
| Outer Diameter | 22 mm – 68 mm (0.87 in – 2.68 in) |
| Width (Thickness) | 6 mm – 15 mm (0.24 in – 0.59 in) |
| Material | Chrome steel (GCr15), through-hardened |
| Cage Material | See variant options |
| Lubrication | Lithium-based grease (factory-filled) |
| Tolerance Grade | ABEC-3 equivalent |
| Operating Temperature | Typically −20 °C to +120 °C (−4 °F to +248 °F) for RS/2RS; higher for Z/ZZ |
| Pack Quantity Options | 1 / 2 / 5 / 10 pieces |
| Dimensional Standard | ISO 15 (6000 & 6900 series) |
Z and ZZ denote metal shields that do not contact the inner ring, resulting in lower friction and suitability for higher rotational speeds. RS and 2RS denote rubber contact seals that press lightly against the inner ring, providing a tighter barrier against dust and moisture ingress and better grease retention — at a slight friction penalty. Choose Z/ZZ for high-speed motors and RS/2RS for dusty or wet environments such as outdoor equipment or food-adjacent machinery.
Measure your shaft diameter (bore) and housing bore with a vernier caliper. The shaft diameter must match the bearing's inner diameter (ID) and the housing bore must match the outer diameter (OD). Cross-reference both values against the variant option "Inner Dia x Outer Dia x Thickness" listed in this product. If you are replacing an existing bearing, the model number stamped on the bearing side face (e.g., 6004-2RS) maps directly to the Modell option in this listing.
Standard chrome steel (GCr15) bearings are not inherently corrosion-resistant. For occasional moisture exposure, the RS/2RS rubber seal provides a meaningful barrier that slows moisture ingress. For continuous wet or chemically aggressive environments, stainless steel bearings (not included in this listing) are the appropriate choice. Contact us to confirm suitability for your specific conditions.
Dimensionally, Z and RS variants of the same model number (e.g., 6004-ZZ vs. 6004-2RS) share identical bore, outer diameter, and width, so they are physically interchangeable in the same housing. However, mixing seal types on the same shaft is generally not recommended because their friction characteristics and lubrication intervals differ, which can lead to uneven wear. Use the same seal type on both ends of a shaft wherever possible.
Deep groove ball bearings are primarily designed for radial loads but can also accommodate moderate axial (thrust) loads in both directions. They are not suitable for heavy axial-only loads or combined loads that exceed the bearing's rated capacity. For applications with significant axial loading, angular contact or thrust bearings are more appropriate. Refer to the bearing manufacturer's load rating tables for your specific model if precise load calculations are required.
Sealed bearings (Z/ZZ and RS/2RS) are factory-filled with grease and designed to be maintenance-free for their rated service life under normal operating conditions. The seals prevent re-lubrication from the outside. If operating at elevated temperatures, high speeds, or under heavy loads that shorten grease life, the bearing should be replaced rather than re-lubricated. Open (unshielded) bearings, which are not included in this listing, allow periodic re-greasing.
Select the "Pack of Quantity (Pcs)" option that matches your need: 1 piece for a single replacement, 2 pieces for a paired shaft installation, 5 or 10 pieces for maintenance stock or production use. Each pack contains the quantity shown — for example, selecting "5" gives you five individual bearings of the chosen model and size. Per-unit pricing decreases with larger pack quantities.
