Hardware knowledge: daily judgment of rolling metal bearings

It is understood that only by knowing it can you use it, and only by understanding the functionality of hardware tools can you use it well. Bearings, you can first look at its smoothness (or roughness), the quality is good at a glance, no need to talk about it. Taking a closer look, you can hold the bearing in your hand and turn it vigorously to see if it rotates smoothly and naturally, without noise.

The 6XXXX series bearings of nsk, which are generally used, are really easy to use, but the price is more than twice that of domestic products. But it has a long service life. Compared with most domestic bearings, one can be used for two. So the price is good.

There are not many shops selling professional bearings, you can go to the places where you get together in the hardware store to buy them. (There may also be places that sell auto parts, motorcycle parts, and belts.) You don't need to go to small stores. Generally, fixed stores with such bearings will have a very eye-catching brand. You ask them to issue an invoice when you buy it, and you usually won't give fakes.

I have used domestic bearings in Harbin. It is more economical to buy these. The quality is also good. However, the noise is a bit loud after a long time, and it needs lubrication, otherwise it should be rusty.

The quality of bearings in Singapore is between nsk and domestically produced.