3218 A
Double Row Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
3218 A
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Double Row
Weight
4.15 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.015mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.018mm to 0
Width
52.4 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
2 mm
Distance from side face to load point
94 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
111.53 mm
Outer Ring Dimensions
Shoulder diameter outer ring
136.76 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
29250 lbf
Radial static load rating
27000 lbf
Limiting speed
3.6 X 1000 rpm
Lubrication
Lubricated
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 65.66
/ each
In Stock
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3218 A Bearing Product Overview & Core Advantages
The 3218 A is a double row angular contact ball bearing designed for applications requiring high precision and exceptional rigidity. This precision bearing excels at simultaneously handling combined loads, including significant radial loads and bidirectional axial loads, within a compact design envelope. Manufactured to P6 (ABEC-3) tolerance class, it ensures reliable performance in demanding industrial environments. Its open design, complemented by factory-applied lubrication, provides versatility for custom sealing and lubrication solutions.
3218 A Bearing Model Code Explained, Specifications & Naming Convention
The model number 3218 A is decoded as follows:
- 3218: Basic series designation, indicating a metric double row angular contact ball bearing with a 90mm bore.
- A: Signifies a 30° contact angle, optimized for carrying higher axial loads compared to standard designs.
3218 A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design provides superior radial and moment load stiffness. With a radial dynamic load rating of 29,250 lbf and a static load rating of 27,000 lbf, it is engineered for robust performance under combined loads.
- Optimized for Precision: The stainless steel cage ensures stability at the specified limiting speed of 3,600 rpm. The precisely defined shoulder diameters on both rings guarantee accurate axial positioning.
- Material Integrity: Constructed from chrome steel for both rings and balls, the bearing offers high durability and fatigue resistance, operating effectively within a temperature range of -30°C to 110°C.
3218 A Bearing Typical Application Areas
This bearing is ideally suited for high-precision and high-rigidity applications, including:
- Machine Tool Spindles
- Industrial Gearboxes
- Precision Pumps and Compressors
- Material Handling Equipment
