To measure tapered roller bearings, you primarily focus on three key dimensions: Inside diameter, Outside diameter, and Width.
Taper roller bearings are still measured in the same way: Inside diameter x Outside diameter x Width. These dimensions provide the fundamental size information needed for identification and replacement. Bearings are also identified by a set of numbers and sometimes letters, depending on the manufacturer, which represent a specific bearing model and its characteristics.
Key Measurements
Measuring these three dimensions helps you determine the correct bearing size for your application.
- Inside Diameter (ID): The diameter of the bore, which fits onto the shaft.
- Outside Diameter (OD): The largest diameter of the outer ring.
- Width: The overall width of the assembled bearing.
Here's a simple breakdown:
| Measurement | Description | Location on Bearing |
|---|---|---|
| Inside Diameter | Diameter of the inner ring bore | Fits onto the shaft |
| Outside Diameter | Diameter of the outer ring | Fits into the housing |
| Width | Total axial width of the bearing assembly | From one face to the other |
Bearing Identification Numbers
Beyond physical measurements, tapered roller bearings are also identified by manufacturer-specific part numbers.
- These numbers and letters are crucial for ordering the correct replacement.
- They encode information about the bearing's size, type, series, and sometimes internal design features.
- Finding the number on the bearing itself is often the most reliable way to identify it, in conjunction with the physical measurements.
Practical Steps for Measurement
When measuring, use precision tools like calipers or micrometers.
- Measure the Inside Diameter: Measure the bore of the inner ring (cone).
- Measure the Outside Diameter: Measure the outside diameter of the outer ring (cup).
- Measure the Width: Measure the total width of the assembled bearing.
Always cross-reference your measurements with the part number found on the bearing to ensure accurate identification.
