Table 1 below shows the chemical composition. Nylon or brass are available upon request. ZXZ uses a variety of high temperature operation and compatibility with grease. Buna-Nitrile is the standard material used. Bearing tolerance includes dimensional tolerance and revolving tolerance.
Dimensional tolerance is a request when bearings are mounted on shafts or in housings.
Revolving tolerance includes radial and axial runout of assembled bearing inner ring and outer ring, inner ring reference face runout with bore and outside cylindrical surface runout with outer ring reference face. Tolerance class ranges from common class 0 to 6,5,4 and 2,from low to high. Table 3 below is the tolerance class stipulated in Chinese GB307 standard and its comparison with some other standards. The standard manufacturing tolerance for ZXZ precision radial bearings is class 6, as shown in Table 4. Cs Vcs open bearings capped Diameter series 9 0.1 2.34 0.1.2.3.4 Over Incl.