6203-2NSE9 C3 NACHI Brand Rubber Seal Ball Bearing | 17x40x12 mm | Double Sealed | High Speed | 6203 2RS 6203RS

These worked well as replacement bearings for a polaris pb4-60 booster pump. You need two bearings. I tried the method suggested on Youtube, where you heat up the bearings to 225 degrees Fahrenheit, and then slide them onto the shaft. I used a toaster oven for this. But it didn't really work. I still had to tap them into place with a socket and a hammer.I was wishfully thinking that the booster pump would run super quiet after installing the new bearings, but it didn't happen. The motor still makes noise, but it's OK. It's not bad. I suspect most of the noise is due to the impeller moving inside water.

I've used this brand for a while now and have had good luck.I started out using All Balls believing they were a quality bearing but found they were typical Chinese bearing with a short lifespan.After much research I decided to try these to replace the failing ALL Balls bearings and so far they are on par with Timken bearings I have used in the past and are typical of a great quality Japanese bearing.When used on a motorcycle it's a good idea not to kill yourself with substandard wheel bearings.

Many years now have ran then in a Hydro Generator with a lot of pressure. Change them out yearly and have had no failures.

Sold as " japan " made bearings which is not true. the word Taiwan is clearly stamped on the seal. Don't get fooled thinking you will have superior quality by paying a higher price, it's not the case with those bearings. You will find chinese or ROC ones for cheaper elsewhere on amazon.