NSK 6203ZZ Deep Groove Ball Bearing, Single Row, Double Shielded, Pressed Steel Cage, Normal Clearance, Metric, 17mm Bore, 40mm OD, 12mm Width, 17000rpm Maximum Rotational Speed, 1079lbf Static Load Capacity, 2147lbf Dynamic Load Capacity

Used them to repair my 2 year old Pentair pump. The original bearings only lasted 2 years. What a joke. My old pump bearings lasted 20 years and were still very quiet. The spa guy wanted to put in a new pump for $750.00. I bought the gasket kit and pulled the pump put it on my bench installed the new bearings and gaskets and seals. It cost me $30.00 and an afternoon working with my hands, which I enjoy.Its now a year later and the pump is silent. A word of advice. Stay away from the cheap Chinese bearings. Spend a couple more bucks on Good USA bearings and save yourself from having to repeatedly rebuild the motor due to the use of the cheap bearings.

It’s perfect ( same as OE )

These are made in the US. I purchased a replacement set labeled as Pentair replacement along with the NSK's based upon a previous review. Silly to even compare them. I started a return of the cheap Chinese ball bearings when a neighbors pump also began to squeal. Wound up useing themin his pump. Like night and day.While you couldn't tell that my pump was on, his motor sounded like a can opener. He is very happy to have saved a bundle for the cost of buying me lunch. Lots of slop and movement in the Chinese bearings and cheap oiled paper. The NSK's are all metal, sealed from the elements. I packed them in lithium grease more out of habit and to efficiently transmit heat to the motor casing than out of need for lubrication.Many thanks to a previous purchaser that reviewed these.

This bearing fits other vehicles, but if you own a 2015-2019 Outback then this is the perfect replacement for a whining/failing factory pulley tensioner bearing. Cover a large socket with a piece of wood then bang it out the old one.

I was very happy with result after replacing table saw and motor bearings with the NSK 630ZZ bearings as everything ran much quieter. Read on for my experience using the bearings.I replaced the bearings in my 30 year old table saw, a Powermatic 63 for the arbor and the motor (both had same bearings). The old bearings were a 6203Z. The difference is that these 6203ZZ bearings are metal shield (not sealed) on both sides vs the old bearing which were open 1 side exposing the bearings. The ZZ is a much better product as it keep debri out of the bearing. The old bearings in the saw had 1 side sealed with rubber seal and the motor 1 side of the bearings was open. The open bearing were full of debris, no wonder they failed. It was obvious they were bad from the grinding feel when turning and one of them just siezed. In order to install the new bearings I froze the arbor and heated the bearing to 180F. The bearings installed fairly easily with some force from a vice and some taps of a socket placed over the outer race of the NSK bearing. WIth the new bearing the table saw and motor made significantly less noise so good on the NSK bearings. As far as price they were the same price on Amazon as from a local bearing shop. The NSK or Japanese bearings were 2-3X the cost as the Chinese version. I went with NSK as forums said the NSK were better quality but the bearing shop owner said the Chinese were similar quality. Who knows but to be sure I went with the Japanese mfr.CONCLUSION: Highly recommended.

Super quiet at install, a little noisier after a month. Still very quiet. Found that the local ACE hardware carries these as well.

I put these bearings in a 2 hp electric motor on a delta tablesaw that would’ve cost a small fortune to replace if I could have found one these old split phase electric motors are built like tanks and are way better quality then any of the Chinese motors sold today definitely worth $16 to fix it runs smooth and quiet just like new! The whole job took me about 30 minutes I’m a happy camper. I will definitely be ordering a few more just to have them around in case I run across any other motors that need bearings.

Worked perfect as a replacement in my century pool pump motor. Motor runs and sounds like it’s brand new. We were having to replace pump motors every few years due to bearing failure. After a sales rep told me these motors were designed for the bearings to fail after two years I decided to replace them to see if that was the problem and sure enough it was. He said the motor will last 20 years only the bearings go out prematurely. These worked perfect and cheaper than buying at a pool store