6203
17
40
12
1
750
460
-
-
20000
65
The ISK Bearings 6203 OPEN is a single-row deep groove ball bearing with a 17mm bore (d), 40mm outer diameter (D), and 12mm width (B). Both sides are open, with no built-in shields or seals. This means the bearing itself provides no external shielding — lubricant supply and retention, along with protection against outside contamination, need to be handled by the equipment design, such as a central lubrication system, external seals, or a relatively clean enclosed housing. Whether it fits your case still depends on the actual operating conditions.
With an open design, the key point to clarify is who handles lubrication and protection. It helps to confirm the lubrication method (system-fed, oil bath, or external re-greasing), the cleanliness and humidity of the operating environment, and the load and speed range. These conditions directly affect whether an open type suits you better than a shielded version. If the environment carries significant dust or moisture, it's worth evaluating whether a shielded (ZZ) or sealed (2RS) version would be a better fit.
If you're evaluating the 6203 OPEN for a specific piece of equipment, it helps to share three things first: lubrication method, operating environment, and load/speed. We can then help judge whether the open type fits, or whether another variant would suit better. If you already have a part number, drawing, or sample, feel free to include it too.
Some non-standard or currently out-of-stock bearings may not be immediately available. If you have specific requirements, feel free to contact us — we will do our best to confirm lead times and provide alternative solutions.
