Selecting the right bearing is more than just matching numbers. Two part numbers that often confuse buyers and maintenance professionals are the 6203-2RS bearing and the 6203-2RS-8 bearing. While they appear almost identical, the difference in the bore size is significant and determines which applications each bearing is suitable for.
This article explains how these two bearings differ, what their designations mean, and how to choose the correct 6203-2RS-8 bearing or 6203-2RS bearing for your equipment.
What the Code 6203-2RS Really Means
The 6203-2RS bearing is a standardized, globally recognized model of deep groove ball bearing. It is one of the most widely used bearings in electric motors, power tools, pumps, and industrial equipment.
The “6” identifies it as a single-row deep groove ball bearing, capable of handling both radial and axial loads. The “2” indicates its dimensional series. The “03” corresponds to a 17 mm bore size, and “2RS” means the bearing is sealed on both sides with rubber seals to protect from dust and moisture.
In short, the 6203-2RS bearing features:
- 17 mm inner diameter
- 40 mm outer diameter
- 12 mm width
For a full guide to understanding bearing codes, visit our bearing identification guide.
Understanding the 6203-2RS-8 Bearing and Its Uses
At first glance, the 6203-2RS-8 bearing looks identical to the 6203-2RS. However, its bore size sets it apart.
The suffix “-8” indicates an imperial (inch-based) bore. The 6203-2RS-8 bearing has a 1/2 inch (12.7 mm) inner diameter instead of the 17 mm metric bore found in the standard 6203-2RS.
Although both share the same outer diameter (40 mm) and width (12 mm), this difference allows the 6203-2RS-8 to fit 1/2-inch shafts, commonly used in American-made power tools, lawn mowers, and small engines.
The Main Difference Between 6203-2RS and 6203-2RS-8 Bearings
The key distinction between the two models is the inner bore diameter.
- The 6203-2RS bearing fits 17 mm metric shafts.
- The 6203-2RS-8 bearing fits ½ inch (12.7 mm) imperial shafts.
Both are double-sealed, share the same external dimensions, and offer equal load capacities and speeds. The only change is the bore, which determines the correct fit for your shaft type.
Using the wrong bearing can lead to misalignment, vibration, and premature failure. Always verify your shaft diameter before installation.
Applications of the 6203-2RS-8 Bearing in Industrial and Power Equipment
The 6203-2RS bearing is found in equipment that uses metric shafts such as electric motors, conveyors, and fans.
The 6203-2RS-8 bearing is used in machines with imperial shafts, such as lawn mowers, snow blowers, and American-built industrial tools.
Both models perform similarly, but their shaft compatibility determines which one is correct for your application.
Choosing the Correct Bearing for Your Application
When choosing between the 6203-2RS and the 6203-2RS-8 bearing, shaft measurement is the deciding factor. Always measure your shaft diameter first:
If your shaft measures 17 mm, choose the 6203-2RS bearing.
If your shaft measures ½ inch (12.7 mm), choose the 6203-2RS-8 bearing.
Load rating, speed, and sealing are identical between the two. For facilities that service both metric and imperial machines, stocking both types ensures faster maintenance and reduced downtime.
Final Thoughts
Though the 6203-2RS and 6203-2RS-8 bearings are visually similar, the small variation in bore size makes a major difference. The 6203-2RS is made for metric shafts, while the 6203-2RS-8 bearing fits ½-inch imperial shafts.
Selecting the correct bearing ensures longer lifespan, smoother performance, and proper fit. Always check the shaft diameter before installation and refer to a reliable bearing specification guide when in doubt.
Purchase High-Quality 6203-2RS-8 Bearings Online
Looking to buy genuine 6203-2RS-8 bearings? At PGN, we supply both 6203-2RS and 6203-2RS-8 bearings with premium seals and precision manufacturing standards. Our products are designed for long-lasting performance in both industrial and commercial equipment.
Shop directly through our online catalog or contact our sales team for a business-to-business high volume quote. We offer competitive pricing, fast shipping, and expert technical support for all bearing types.