| Part Number | MR31 |
| System of Measurement | Metric |
| Bearing Type | Ball |
| For Load Direction | Radial |
| Construction | Single Row |
| Inner Ring Type | Standard |
| Seal Type | Open |
| Bore Dia | 1 mm |
| Bore Dia Tolerance | -0.008mm to 0 |
| Outer Dia | 3 mm |
| Outer Dia Tolerance | -0.008mm to 0 |
| Width | 1.5 mm |
| Width Tolerance | -0.12mm to 0 |
| Ring Material | Chrome Steel |
| Ball Material | Chrome Steel |
| Cage Material | Stainless Steel |
| Dynamic Radial Load | 22 lbf |
| Static Radial Load | 6 lbf |
| Max Speed (X1000 rpm) | 117 |
| Lubrication | Required |
| Temperature Range | -30° to 110 °C |
| Tolerance Class | ABEC1 |
| Radial Clearance Trade No | MC3 |
| Radial Clearance | 0.005mm to 0.01 mm |
| RoHS | Compliant |
| REACH | Compliant |
| Ball Dia | 0.6 mm |
| Ball Qty | 6 |
| Weight | 0.04 g |
Application Areas
The MR31 bearing's small size, high precision, and reliable performance make it suitable for a wide range of applications across various industries:
Electronics Industry: It is widely used in components such as hard disk drives (HDDs), DVD spindles, and small - sized motors. In HDDs, the MR31 bearing enables the smooth rotation of the spindle, ensuring accurate data read and write operations. It is also used in printers, computer fans, and other electronic devices where compact and efficient bearings are required.
Medical Field: Applied in medical devices like pulmonary assist devices, where precise and smooth rotation is crucial for proper functioning. Its small size and reliable performance make it suitable for use in miniaturized medical equipment. It is also used in dental drills, surgical instruments, and other medical devices that demand high - precision components.
Instrumentation: Found in high - precision measuring equipment and sensors. The MR31 bearing's low - noise operation and high - speed capabilities ensure reliable performance in these applications, helping to maintain the accuracy of the measuring instruments. It is used in laboratory equipment, optical instruments, and other precision devices.
Consumer Goods: Used in items like clocks, where its small size and smooth rotation contribute to accurate timekeeping. It is also utilized in toys, especially small - scale model toys, and in various precision instruments and electronic equipment that demand compact and efficient bearing solutions.
Automotive and Aerospace (in miniature components): Although its size is small, in some miniature components for automotive and aerospace applications, such as in micro - actuators or sensors, the MR31 bearing can be used due to its high - speed and high - precision characteristics.
