DEEP GROOVE BALL BEARINGS & NON-STANDARD BEARING Deep groove ball bearing & non-standard bearing,generally speaking,does not conform to the dimensions of the national standard.That is for all bearings whose dimension is different from those specified in the national standards.Its main characteristics are low degree of universality, mostly for special equipment, special application and small batch, new research and development equipment trial products accounted for the majority; but because of its non-scale and non-mass production, production enterprises are not many, the cost is high, so causes expensive price.