1. Scope
This standard defines the specifications, testing methods, inspection rules, marks and rustproof packaging for deep groove ball bearings (hereinafter referred to as bearings), whose bore diameters range from 3mm to 120mm, for normal electric motors.
This standard can be applied to the production, inspection and user acceptance of bearing factories.
2. Normative References
3. Symbols
The symbols given by GB/T 7811-2007 are also compliant with this standard.
4. Designation systems
The designation systems of the bearings follow the standard GB/T 272-1993 and JB/T 2974-2004.
Designation example:
