Non-standard bearings, in layman's terms, are bearings that do not meet the external dimensions specified by national standards, that is, all bearings whose external dimensions are different from those specified by national standards.
Its main characteristics are that the degree of versatility is low, and it is mostly used for special equipment and special occasions, and the batch is small, and the trial products of new R&D equipment account for the majority; but because of its non-scale and mass production, there are not many production enterprises, and the cost is high. , the price is more expensive.
The inner diameter or outer diameter, width (height) and dimensions of standard bearings conform to the bearing dimensions specified in GB/T 273.1-2003, GB/T 273.2-1998, GB/T 273.3-1999 or other relevant standards.
Non-standard bearings are non-standard bearings that do not match the size and structure of standard bearings, that is, bearings produced according to customer requirements. Non-standard inside and outside 49 standard 50 everything else is the same. Then 49 is a non-standard, you have to compare it according to the size structure on the customer book, otherwise you will know whether 49 is the national standard or 50.
There are also different structures. For example, some steel balls have more rollers. Or less. This kind of rare, generally can be used for the full name of non-standard bearings.
