Because the bearings of the disc grinder worn out and abnormal noise and vibration occurred, I bought it for replacement. It can be used normally. Because it is made in Japan, it can be used with confidence.
The stamp of the bearing attached before was 6200Z. Since the backlash occurred, I ordered 6200 ZZ, but the stamp was also 6200 Z. To say that there is a possibility of the same goods as the bearings used before. If it is the same, it is doubt whether measures could be taken by replacing the bearings. It is described as 6200ZZ in the delivery note sent, and I think that any backlash of the same result will occur if it is not a mistake. If the product is 6200 ZZ, should the marking be 6200 ZZ too?