7228 BM
Single Row Angular Contact Ball Bearings
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Part No.
Part No.
7228 BM
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
8.85 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.018mm to 0
Outside diameter
250 mm
Outside diameter tolerance
-0.02mm to 0
Width
42 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
3 mm
Contact angle
40 °
Distance from side face to load point
103 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
183.3 mm
Inner ring small-side shoulder diameter
163.6 mm
Outer Ring Dimensions
Shoulder diameter outer ring
209.55 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
44775 lbf
Radial static load rating
47700 lbf
Limiting speed
3.6 X 1000 rpm
Lubrication
Lubricated
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Brass
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
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7228 BM Bearing Product Overview & Core Advantages
The 7228 BM is a single row angular contact ball bearing engineered for applications requiring high precision and reliable performance under combined loads. This precision bearing is characterized by its ability to accommodate significant axial loads in one direction in addition to radial loads, thanks to its defined 40° contact angle. Manufactured to a P6 (ABEC-3) tolerance class, it ensures high running accuracy. Its open design and brass cage contribute to its suitability for high-speed operation, making it an excellent choice for demanding industrial environments where high rigidity and operational reliability are paramount.
7228 BM Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| B | Denotes a 40° contact angle, which provides a high thrust capacity. |
| M | Indicates the cage is made from brass (copper alloy), offering high strength and excellent guidance at high speeds. |
7228 BM Bearing Structural Features & Performance Benefits
- High Load Capacity & Rigidity: The single row design with a 40° contact angle is optimized to support substantial combined loads (radial and axial), providing stable and rigid support for shafts.
- High-Speed Performance: The brass cage (M suffix) ensures superior cage stability and guidance, contributing to a high limiting speed of 3,600 rpm. The open design facilitates efficient lubrication and cooling.
- Precision Engineering: Manufactured to P6 tolerance class, this bearing guarantees high running accuracy and low vibration, which is critical for precision machinery.
- Durable Construction: Components made from chrome steel for rings and balls provide high fatigue life and durability under demanding operating conditions.
7228 BM Bearing Typical Application Areas
This angular contact ball bearing is ideally suited for a wide range of high-performance applications, including:
- Machine Tool Spindles
- Pumps and Compressors
- High-Speed Gearboxes
- Precision Industrial Machinery
