51238 M
51200 Series Single Direction Thrust Ball Bearings
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Part No.
Part No.
51238 M
Basic Information
Bearing type
Ball
System of measurement
Metric
Weight
12 kg
Seal type
Open
For load direction
Thrust
Main Dimensions
Bore diameter
190 mm
Bore diameter tolerance
-0.03mm to 0
Outside diameter
270 mm
Outside diameter tolerance
-0.035mm to 0
Width
62 mm
Width tolerance
+0.03mm to -0.4mm
Chamfer dimension
2 mm
Ball & Washer Dimensions
Housing washer inner diameter
194 mm
Shaft washer outer diameter
265 mm
Performance
Temperature range
-30° to 110 °C
Axial dynamic load rating
76050 lbf
Axial static load rating
281250 lbf
Limiting speed
1.4 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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51238 M Bearing Product Overview & Core Advantages
The 51238 M is a metric thrust ball bearing engineered for demanding applications requiring high axial load capacity and precision operation. This bearing is specifically designed to accommodate unidirectional thrust loads with exceptional reliability. Its construction from high-grade 52100 Chrome Steel for both rings and balls ensures superior strength and durability. The open design allows for versatile lubrication options, making it suitable for high-speed operation up to 1,400 rpm. It is an ideal solution for compact, high-load assemblies where precise axial positioning is critical.
51238 M Bearing Model Code Explained, Specifications & Naming Convention
The model number 51238 M can be broken down as follows:
- 51238: Denotes the basic bearing series, indicating a single-direction thrust ball bearing with specific bore (190mm) and outside (270mm) diameters.
- M: This suffix signifies that the bearing's cage (retainer) is machined from Stainless Steel. This construction offers high strength, excellent guidance, and superior performance at higher speeds compared to stamped cages.
51238 M Bearing Structural Features & Performance Benefits
- High Axial Load Capacity: Engineered with a robust single-direction design, this bearing delivers a high axial dynamic load rating of 76,050 lbf and an exceptional axial static load rating of 281,250 lbf, making it capable of handling significant thrust forces.
- Precision & Rigidity: Manufactured with tight dimensional tolerances on the bore, outside diameter, and width, it ensures precise shaft and housing fits, contributing to high system rigidity and accurate axial positioning.
- Optimized for Speed: The use of a machined stainless steel cage (M) provides lower friction, better ball guidance, and stability, enabling a limiting speed of 1,400 rpm.
- Durability and Compliance: Components made from 52100 Chrome Steel offer excellent wear resistance. The bearing is compliant with ROHS and REACH regulations, ensuring it meets modern environmental and safety standards.
51238 M Bearing Typical Application Areas
This thrust ball bearing is commonly specified in machinery and systems that experience high axial loads, including:
- Industrial Gearboxes
- Heavy-Duty Machine Tools
- Cranes and Hoisting Equipment
- Automotive Steering Systems
- Marine Propulsion Systems
- Vertical Pumps and Compressors
