7280 BM
Single 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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7280 BM Bearing Product Overview & Core Advantages
The 7280 BM is a single row angular contact ball bearing engineered for high-precision applications requiring exceptional rigidity and load capacity. This precision bearing is designed to accommodate combined loads, specifically high radial loads and unidirectional thrust loads simultaneously, thanks to its defined 40° contact angle. Manufactured to a P6 (ABEC-3) tolerance class, it ensures reliable performance in demanding, high-accuracy environments. Its open design and brass cage contribute to its suitability for high-speed operation.
Model Code Breakdown
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7280 | Standard Bearing Size Designation | Indicates a bore diameter of 400 mm, an outside diameter of 720 mm, and a width of 103 mm. |
| B | 40° Contact Angle | Denotes a steeper contact angle, optimized for handling higher axial loads. |
| M | Brass Cage | Indicates a machined brass cage, offering high strength, excellent guidance, and suitability for high-speed applications. |
7280 BM Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The single row angular contact design, combined with a 40° contact angle and robust construction, provides high rigidity. It supports a dynamic load rating of 163,800 lbf and a static load rating of 337,500 lbf, making it ideal for heavy combined loads.
- Optimized for High-Speed Operation: The machined brass cage (M) ensures stable ball guidance and low friction, contributing to the bearing's high limiting speed of 0.95 x 1000 rpm.
- Precision Performance: Manufactured to P6 tolerance standards, this bearing guarantees precise running accuracy and minimal vibration, which is critical for spindle and other high-precision applications.
- Robust Material Construction: Components are made from chrome steel for rings and balls, providing high durability, wear resistance, and a long operational lifespan under demanding conditions.
7280 BM Bearing Typical Application Areas
The 7280 BM is ideally suited for heavy-duty industrial machinery where high precision, speed, and load capacity are paramount. Key applications include:
- Machine Tool Spindles
- Large Industrial Pumps and Compressors
- Gearboxes and Heavy-Duty Transmissions
- Precision Turntables and Indexing Tables
- Mining and Construction Equipment
