Material
The bearing’s core components—inner ring, outer ring, and rolling elements—are constructed from high-grade 52100 chromium steel, which delivers exceptional hardness, wear resistance, and dimensional stability to handle the demands of micro-scale rotation. The double metal shields are made from zinc-plated steel, offering robust defense against dust and fine particles while withstanding moderate temperature variations.
Characteristics
1. High rotational efficiency: The thin, low-friction metal shields minimize resistance, enabling smooth operation at high speeds—ideal for devices where rapid, consistent rotation is critical.
2. Dry contamination protection: The ZZ shields effectively block dust, lint, and small dry debris, making it suitable for clean environments like electronics assembly or precision instrument enclosures.
3. Compact durability: Its ultra-small dimensions (a hallmark of the MR series) allow integration into space-constrained designs, while the high-strength steel construction ensures long-term performance under light to moderate loads.
4. Temperature tolerance: The metal shields and steel body support stable operation in temperatures up to 120°C, outperforming rubber-sealed bearings in heat-exposed micro-systems.
Applications
1. Micro-motors: Such as those in hearing aids, miniature vibration motors for wearables, and tiny drive units in medical pumps.
2. Precision robotics: Components like micro-actuators in surgical robots, joint mechanisms in miniaturized drones, and gripper systems for micro-assembly.
3. Consumer electronics: Including rotating parts in smartwatch buttons, micro lens adjusters in compact cameras, and drive mechanisms in portable sensors.
4. Optical devices: Like mirror rotation components in micro spectrometers, laser diode mounting systems, and fiber optic alignment tools.
| Part Number | MR63ZZ |
| Characteristics |
| System of Measurement | Metric |
| Bearing Type | Ball |
| Seal Type | Shielded |
| Inner Ring Type | Standard |
| For Load Direction | Radial |
| Construction | Single Row |
| Ball Qty | 8 |
| Tolerance Class | ABEC1 |
| Dimensions |
| Bore Dia | 3 mm |
| Bore Dia Tolerance | -0.008mm to 0 |
| Outer Dia | 6 mm |
| Outer Dia Tolerance | -0.008mm to 0 |
| Width | 2.5 mm |
| Width Tolerance | -0.12mm to 0 |
| Ball Dia | 0.8 mm |
| Radial Clearance | 0.005mm to 0.01 mm |
| Radial Clearance Trade No | MC3 |
| Material |
| Ring Material | Chrome Steel |
| Ball Material | Chrome Steel |
| Cage Material | Carbon Steel |
| Shield Material | Carbon Steel |
| Performance |
| Dynamic Radial Load | 40 lbf |
| Static Radial Load | 13 lbf |
| Max Speed (X1000 rpm) | 71 |
| Temperature Range | -30° to 110 °C |
| Properties |
| Lubrication | Required |
| RoHS | Compliant |
| REACH | Compliant |
| Weight | 0.28 g |
