7256 BM
Single Row Angular Contact Ball Bearings
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Part No.
Part No.
7256 BM
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
67.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
280 mm
Bore diameter tolerance
-0.025mm to 0
Outside diameter
500 mm
Outside diameter tolerance
-0.033mm to 0
Width
80 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
5 mm
Contact angle
40 °
Distance from side face to load point
204 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
367.7 mm
Inner ring small-side shoulder diameter
328.07 mm
Outer Ring Dimensions
Shoulder diameter outer ring
417.7 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
114075 lbf
Radial static load rating
186750 lbf
Limiting speed
1.4 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
Price available upon request.
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7256 BM Bearing Product Overview & Core Advantages
The 7256 BM is a single row angular contact ball bearing engineered for precision applications requiring high rotational accuracy and exceptional load capacity. Designed with a 40° contact angle, this bearing excels at supporting combined radial and axial loads in one direction. Its P6 (ABEC-3) tolerance class ensures superior running accuracy, making it ideal for high-speed machinery and precision equipment where reliability and performance are critical.
7256 BM Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| BM | Indicates a brass cage and optimized internal design for enhanced high-speed performance and stability. |
7256 BM Bearing Structural Features & Performance Benefits
- High Load Capacity: The optimized 40° contact angle and robust construction deliver outstanding radial dynamic load rating of 114,075 lbf and static load rating of 186,750 lbf, enabling reliable operation under demanding conditions.
- Precision Performance: Manufactured to P6 (ABEC-3) tolerance class with precise bore and outside diameter tolerances, ensuring minimal vibration and superior running accuracy for precision applications.
- High-Speed Capability: The brass cage (BM) provides excellent dimensional stability and strength, contributing to a limiting speed of 1,400 rpm while maintaining operational reliability.
- Optimized Internal Geometry: Carefully calculated shoulder diameters and chamfer dimensions ensure proper load distribution and facilitate precise mounting in complex assemblies.
7256 BM Bearing Typical Application Areas
This precision angular contact ball bearing is widely used in:
- Machine Tool Spindles and high-precision machining centers
- Industrial Pumps and compressors requiring high-speed operation
- Precision Gearboxes and transmission systems
- Medical Equipment and laboratory instruments demanding high accuracy
- Robotics and automation systems where reliability is paramount
