How to judge the bearing size when the bearing model is known?

Bearing models generally consist of model code, width series code, diameter series code and inner diameter code from left to right. For example, bearing model 3 1208, 3 is the category code, 1 is the width series code, 2 is the diameter series code, and 08 is the inner diameter code. In this way, we know that this model is a tapered roller bearing, the size series is 12, and the inner diameter is 40 mm. Because the bearing is usually used as a standard, its external dimensions are also standard. Therefore, according to the latest national standard GB/T273. 1 (overall scheme of external dimensions of tapered roller bearings) and the parameters of internal dimensions and dimension series, we can query the corresponding external dimensions of this model.

The above situation only applies to the case that the bearing size meets the national standards of GB/T273. 1, GB/T273.2 and GB/T273.3, except for non-standard bearing models and non-standard bearings.

However, in general, in order to quickly find out the external dimensions of bearings according to their models, the external dimensions of bearings can also be found through bearing samples or the Internet.