| Part Number | SMR31 |
| 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 | Stainless Steel |
| Ball Material | Stainless Steel |
| Cage Material | Stainless Steel |
| Dynamic Radial Load | 19 lbf |
| Static Radial Load | 5 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 |
1. Dimensions
It has an inner diameter of 1 mm, an outer diameter of 3 mm, and a width of 1.5 mm. The bore and outer diameter tolerances are both -0.008 mm to 0, and the width tolerance is -0.12 mm to 0.
2. Material
The ring and ball materials are 440C stainless steel, which provides good corrosion resistance and wear - resistance. The cage is made of 300 series stainless steel, ensuring the balls are evenly spaced.
3. Performance
Dynamic radial load: It can handle 19 lbf.
Static radial load: The capacity is 5 lbf.
Maximum speed: It can reach 117,000 rpm.
It has a radial clearance of 0.002 - 0.013 mm (trade no. MC3, with other options available), and a standard ABEC 1 rating (ABEC 3/5/7 are also available).
4. Features
With an open - type seal, it allows for easy lubrication. It offers high - speed capabilities, low friction, and reduced noise levels.
5. Applications
It is widely used in various industries, such as cryogenic coolers, pulmonary assist devices, clocks, instrumentation, fuel controls, and surveillance systems.
6. Standards
The SMR31 bearing is RoHS and REACH compliant, meeting environmental requirements.
