NSK High Precision Double Row Cylindrical Roller Bearings NN3009MBKRE44CC1P4 45x75x23mm
The NSK NN3009MBKRE44CC1P4 is a high - precision double - row cylindrical roller bearing with an inner ring having three ribs, tailored for high - rigidity, high - speed, and heavy - load application scenarios like machine tool spindles and precision rotating machinery.
The NSK NN3009MBKRE44CC1P4 is a high - precision double - row cylindrical roller bearing with an inner ring having three ribs, tailored for high - rigidity, high - speed, and heavy - load application scenarios like machine tool spindles and precision rotating machinery. Below is its detailed introduction:
Core Attributes and Structural Breakdown
| Code | Meaning |
|---|---|
| NN | Double - row cylindrical roller bearing with a triple - ribbed inner ring |
| 3009 | 30 indicates the size series, and 09 means the bore diameter is 45 mm (calculated as 09×5) |
| MB | Rolling element - guided copper alloy cage |
| KR | Tapered bore with a taper ratio of 1:12, facilitating interference fit installation |
| E44 | Outer ring is equipped with lubrication grooves and 4 oil holes (each with a diameter of 2 mm, oil groove width of 3.5 mm), enabling efficient lubricant circulation |
| CC1 | Standard radial internal clearance for tapered bore |
| P4 | ISO Class 4 precision (equivalent to ABEC7), ensuring extremely high rotational accuracy and running smoothness |
Key Specifications
| Parameter | Value |
|---|---|
| Bore diameter (d) | 45 mm |
| Outer diameter (D) | 75 mm |
| Width (B) | 23 mm |
| Minimum chamfer (r) | 1 mm |
| Basic dynamic load rating (Cr) | 59.5 kN |
| Basic static load rating (C0r) | 68.5 kN |
| Limiting speed (grease lubrication) | 12500 min⁻¹ |
| Limiting speed (oil lubrication) | 15000 min⁻¹ |
| Weight | 0.407 kg |
Performance Advantages
- Superior Rigidity: The double - row cylindrical roller design offers outstanding radial rigidity, which can effectively reduce deformation under heavy loads and maintain the precision of the rotating shaft.
- Precision & Stability: The P4 precision grade and CC1 standard clearance guarantee minimal runout and consistent performance during high - speed operation.
- Efficient Lubrication: The E44 - type outer ring with oil grooves and holes allows for continuous and sufficient lubrication, minimizing friction, lowering operating temperature, and extending the bearing's service life.
- Easy Installation: The KR tapered bore (1:12) simplifies interference fit assembly, ensuring a firm connection with the shaft and reducing installation errors.
- Durable Retention: The MB copper alloy cage provides excellent guidance for rolling elements, has strong wear resistance, and can withstand high - speed and high - temperature working conditions.
Application Scenarios
It is ideal for high - precision machine tools (such as turning and milling centers), precision grinders, spindle units of industrial robots, and other high - end rotating equipment that demand high accuracy, rigidity, and reliability. It can also be used in precision test instruments and high - speed transmission systems.
Installation & Maintenance Tips
- When installing with a tapered bore (KR), use an adapter sleeve or withdrawal sleeve for proper interference fitting to avoid damage to the bearing or shaft.
- Utilize the E44 lubrication system for regular oil - supply maintenance, and select the appropriate lubricant based on speed and load to ensure long - term stable operation.
During installation, maintain a clean environment and use professional tools to prevent contamination and ensure the P4 - grade precision is not compromised.
