The accuracy of rolling bearings is divided into (main) dimensional accuracy and rotational accuracy. The accuracy grades have been standardized and are divided into six grades: 0 grade, 6X grade, 6 grade, 5 grade, 4 grade and 2 grade. Accuracy increases sequentially from grade 0, and grade 0 is sufficient for general purposes, but when used in the conditions or occasions shown in Table 1, an accuracy of grade 5 or higher is required. Although the above precision grades are formulated based on ISO standards, their names are different in national standards.Dimensional accuracy (items related to shaft and housing installation)1. Allowable deviation of inner diameter, outer diameter, width and assembly width2. Allowable deviation of inner compound circle diameter and outer compound circle diameter of roller group3. Allowable limit value of chamfer size4. Allowable variation of widthRotation accuracy (items related to the beating of rotating body)1. Allowable radial runout and axial runout of inner and outer rings2. The allowable lateral runout of the inner ring3. The allowable variation of the inclination of the outer diameter surface4. Allowable variation of thrust bearing raceway thickness5. The allowable deviation and allowable variation of the tapered holeBearing type and applicable precision classBearing type Applicable standard Applicable precision classDeep groove ball bearing GB307 Grade 0 Grade 6 Grade 5 Grade 4 Grade 2Angular contact ball bearings Class 0 Class 6 Class 5 Class 4 Class 2Self-aligning ball bearing Class 0Cylindrical roller bearings Class 0 Class 6 Class 5 Class 4 Class 2Tapered roller bearings Metric series (single row) GB307 Grade 0 Grade 6 Grade 6 Grade 5 Grade 4Metric series (double row, four row) SB/T5341994 Grade 0Inch series SB/CO/T1089 Class4 Class2 Class3 Class0 Class00Spherical roller bearing GB307 grade 0Thrust ball bearings Class 0 Class 6 Class 5 Class 4Thrust spherical roller bearings Class 0The GB/T30794 standard divides the bearing grades into G E D C B. ISO, JIS and other standards are compared as follows:Standard AccuracyGB/T30794 B C D E GISO CLASS2 CALSS4 CLASS5 CLASS6 NORMAL CLASSDIN P2 P4 P5 P6 P0ANSI ABEC9 ABEC7 ABEC5 ABEC3 ABEC1JIS JIS2 JIS4 JIS5 JIS6 JIS0Selection of precisionPerformance Requirement Use Case Applicable Accuracy ClassIt is required to place the object with high runout accuracy. Audio and video machine spindles (video recorders, tape recorders)Radar, parabolic antenna shaftMachine tool spindleElectronic computer, disk spindleAluminum foil roll neckMulti-stage rolling mill support bearingsP4P5, P4, P2, ABEC9P5, P4, P2, ABEC9P5P4High-speed rotation superchargerJet engine main shaft, auxiliary machinecentrifugeLNG pumpTurbomolecular pump spindle, protected bearingsMachine tool spindleTensioners P5, P4P5, P4P5, P4P5P5, P4P5, P4, P2, ABEC9P5, P4 Small friction and friction change are required to control machines (synchronous motors, servo motors, gyro gimbals)MeterMachine Spindle P4, ABMA 7PP5P5, P4, P2, ABEC9General accuracy Small motors, gear transmissions, cam transmissions, generators, low-inductance synchronous servo motors, pressure rotors, printers, copiers, testing instruments P0, P6
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