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When a motor shaft wobbles, a 3D printer carriage binds, or a conveyor roller runs rough, the culprit is almost always a worn or mismatched bearing. Engineers, makers, and maintenance technicians who need a reliable source for deep groove ball bearings in a single order will find the full MR, 600, 6200, and 6300 series here — spanning inner diameters from 2 mm (0.08 in) to 100 mm (3.94 in).
Each bearing is a single-row deep groove ball bearing manufactured to standard dimensional tolerances. Inner diameter (ID) ranges from 2 mm to 100 mm, outer diameter (OD) from 5 mm to 215 mm, and width from 2.5 mm to 47 mm. Two seal configurations are available: ZZ (metal shields, low drag, grease-retaining) and 2RS (rubber contact seals, dust- and moisture-resistant). Bearings are pre-greased and ready to install.
Typical applications include DC and stepper motor shafts in robotics and CNC machines, skateboard and inline-skate wheels (608ZZ / 608-2RS), RC car and drone drivetrains, agricultural equipment spindles, conveyor idler rollers, and general-purpose machinery where radial loads dominate. The wide size range makes this listing a single-source solution for prototype builds, repair kits, and small-batch production runs.
| Bearing Type | Single-row deep groove ball bearing |
|---|---|
| Series Covered | MR, 60x, 62xx, 63xx (ISO / JIS standard series) |
| Inner Diameter (ID) | 2 mm – 100 mm (0.08 in – 3.94 in) |
| Outer Diameter (OD) | 5 mm – 215 mm (0.20 in – 8.46 in) |
| Width / Thickness | 2.5 mm – 47 mm (0.10 in – 1.85 in) |
| Seal Type | ZZ (metal shield, non-contact) / 2RS (rubber seal, contact lip) |
| Lubrication | Pre-greased (lithium-based grease, factory-filled) |
| Operating Temperature | Typically –20 °C to +120 °C (ZZ); –20 °C to +100 °C (2RS) |
| Dimensional Standard | ISO 15 / ABEC-3 equivalent metric tolerances |
| Load Direction | Radial (primary) + moderate bidirectional axial |
| Pack Quantity | See variant options (1 pc / 2 pcs / 4 pcs) |
| Exact Model & Dimensions | See variant options |
ZZ bearings use non-contact metal shields that retain grease while allowing a small gap between shield and inner ring. They produce slightly less friction and are suited to clean, dry, or lightly dusty environments such as electric motors and precision instruments. 2RS bearings use rubber seals with a contact lip that physically touches the inner ring, providing a tighter barrier against dust, moisture, and light liquid splash. Choose 2RS for outdoor equipment, food-adjacent machinery, or any application where contamination is a concern.
These are ISO/JIS standard series designations that indicate the bearing's dimensional proportions. MR series covers miniature bearings with IDs from 2 mm to 9 mm and very small ODs — common in RC cars, drones, and precision instruments. The 600/6xx series spans a wide range from ID 3 mm to 100 mm with moderate cross-sections. The 6200 series uses a slightly larger OD and width for a given bore compared to the 6000 series, offering higher load capacity. The 6300 series has an even heavier cross-section, suited to higher radial loads. All series share the same deep groove raceway geometry and are interchangeable with housings machined to the corresponding standard.
Deep groove ball bearings are primarily designed for radial loads, but their deep raceway geometry allows them to carry moderate axial loads in both directions simultaneously. As a conservative guideline, axial load capacity is typically 20–50% of the dynamic radial load rating depending on the specific model. For applications where axial loads are dominant or exceed this range, angular contact or thrust bearings are more appropriate. If you are unsure, contact us with your load and speed requirements.
Measure the shaft diameter (= bearing ID), the housing bore diameter (= bearing OD), and the available axial space (= bearing width). These three dimensions — formatted as ID × OD × Width — correspond directly to the model numbers listed in the variant selector. For example, a shaft of 8 mm, housing bore of 22 mm, and width of 7 mm matches the 608ZZ or 608-2RS. You can also read the model number stamped on the bearing's outer ring if the original bearing is still accessible.
These bearings are manufactured to ABEC-3 equivalent tolerances, which are appropriate for general-purpose and moderate-speed applications. For reference, a 608ZZ (8 × 22 × 7 mm) is rated for limiting speeds typically in the range of 20,000–30,000 RPM under light loads with grease lubrication. Larger bearings have lower limiting speeds due to greater centrifugal forces on the balls. For high-precision spindle or turbine applications requiring ABEC-5 or higher tolerances, please contact us to confirm suitability before ordering.
No. All bearings in this listing are factory pre-greased and sealed. ZZ and 2RS variants are filled with lithium-based grease at the factory and are ready to install directly. Do not wash the bearing with solvent before installation, as this will remove the factory grease. If the application requires a specific grease type (e.g., food-grade, high-temperature, or low-temperature grease), contact us before ordering so we can advise on compatibility.
The inner ring, outer ring, and balls are made from through-hardened bearing steel (GCr15 / 52100 equivalent), which provides the hardness and fatigue resistance required for rolling contact. The cage (ball retainer) is typically stamped steel. ZZ shields are thin carbon steel. 2RS seals are nitrile rubber (NBR) bonded to a steel insert, providing flexibility and a reliable contact lip. This material combination is suitable for most industrial, hobby, and mechanical applications operating within the stated temperature range.
