51256 M
51200 Series Single Direction Thrust Ball Bearings
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Part No.
Part No.
51256 M
Basic Information
Bearing type
Ball
System of measurement
Metric
Weight
26.5 kg
Seal type
Open
For load direction
Thrust
Main Dimensions
Bore diameter
280 mm
Bore diameter tolerance
-0.035mm to 0
Outside diameter
380 mm
Outside diameter tolerance
-0.04mm to 0
Width
80 mm
Width tolerance
+0.04mm to -0.4mm
Chamfer dimension
2.1 mm
Ball & Washer Dimensions
Housing washer inner diameter
284 mm
Shaft washer outer diameter
375 mm
Performance
Temperature range
-30° to 110 °C
Axial dynamic load rating
109800 lbf
Axial static load rating
522000 lbf
Limiting speed
1 X 1000 rpm
Materials
Ring material
52100 Chrome Steel
Ball material
52100 Chrome Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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51256 M Bearing Product Overview & Core Advantages
The 51256 M is a metric thrust ball bearing engineered for demanding applications requiring high axial load capacity and precision performance. This open-type bearing is designed exclusively to accommodate heavy thrust loads in a single direction. Manufactured from high-grade 52100 Chrome Steel for both rings and balls, it delivers exceptional durability and wear resistance. Its robust construction, featuring a substantial 80 mm width, ensures high rigidity and stable operation under significant stress, making it a reliable choice for high-capacity industrial systems.
51256 M Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| 51256 | Standard metric thrust ball bearing designation, defining the core dimensions (280mm bore, 380mm OD). |
| M | Indicates the use of a copper alloy cage (Note: provided spec states Stainless Steel cage, please verify the "M" designation with manufacturer datasheet for precise material confirmation). |
| (No Seal Suffix) | The bearing is an open type, meaning it has no integral seals or shields, allowing for direct lubrication access. |
51256 M Bearing Structural Features & Performance Benefits
- High Axial Load Capacity: Engineered with a large contact angle and robust construction, this bearing offers an impressive axial dynamic load rating of 109,800 lbf and a massive axial static load rating of 522,000 lbf, making it suitable for the most demanding thrust applications.
- Precision & Rigidity: Manufactured with tight dimensional tolerances on the bore, outside diameter, and width, ensuring precise location and high system rigidity. The substantial cross-section contributes to minimal deformation under load.
- Durable Cage Design: The stainless steel cage provides excellent strength and corrosion resistance, ensuring reliable ball guidance and longevity, even in challenging environments.
- Wide Temperature Range: With an operating temperature range from -30°C to 110°C, this bearing is versatile for use in various industrial climates.
- Compliance & Safety: The bearing is ROHS and REACH compliant, meeting stringent international standards for environmental safety and material restrictions.
51256 M Bearing Typical Application Areas
This high-capacity thrust ball bearing is ideally suited for heavy machinery and equipment where substantial unidirectional axial loads are present. Key applications include:
- Heavy-Duty Industrial Gearboxes
- Vertical Pumps and Compressors
- Construction and Mining Equipment (e.g., thrust arrangements in large rotating assemblies)
- Marine Propulsion Systems
- Large Valves and Actuators
- Presses and Stamping Machinery
