305272 DB
Double Row Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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305272 DB Bearing Product Overview & Core Advantages
The 305272 DB is a double row angular contact ball bearing designed for demanding applications requiring high precision and rigidity. This precision bearing is engineered to accommodate combined loads, simultaneously supporting significant radial loads and axial loads in both directions. Its compact bearing dimensions (220 mm bore, 309.5 mm OD, 76 mm width) and P6 (ABEC-3) tolerance class make it an ideal choice for high-reliability machinery where accurate rotational performance is critical. The open design, combined with stainless steel cage and premium lubrication, ensures optimal performance in a wide operating temperature range.
305272 DB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 305272 | Basic bearing designation indicating the specific size and series. |
| DB | Configuration code for a back-to-back duplex bearing arrangement. This setup provides high rigidity and is effective for moment loads. |
| Open (from spec) | No seals or shields, allowing for higher speed capability and optimal lubrication flow. Requires a clean operating environment or external sealing. |
| P6 (from spec) | Dimensional and running accuracy tolerance class, equivalent to ABEC-3, indicating high precision. |
| Lubricated (from spec) | The bearing is pre-lubricated from the factory for immediate operation. |
305272 DB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design with a back-to-back (DB) arrangement creates a rigid support system that can withstand heavy combined loads and moment loads. With a dynamic load rating of 70,200 lbf and a static load rating of 117,000 lbf, this bearing is built for durability and long service life.
Optimized for Performance: The stainless steel cage ensures low wear and reliable operation at the specified limiting speed. The open construction and precision-ground chrome steel components minimize friction and heat generation.
Precision Engineering: Manufactured to P6 tolerance class, this bearing guarantees consistent running accuracy and smooth operation, which is essential for applications requiring high positional precision.
305272 DB Bearing Typical Application Areas
This bearing is suited for heavy-duty industrial applications where high rigidity and precision are paramount. Typical uses include:
- Machine Tool Spindles
- Industrial Gearboxes
- Large Pumps and Compressors
- Material Handling Equipment
- Precision Rotary Tables
