Low vibration, low noise. Suitable for bad and complicated environment. Precision level all over P5 The accuracy of ZXZC deep groove ball bearings (Mechanical Bearing C28) are divided into four grades of tolerances with national standard GB/T307. 1 which compared with the ISO and AFBMA standard.etc is in the following table. StandardTolerrance class GB/T307.1POP6P5P4 IS0492C LASSOCLASS6CLASS5CLASS4 AFBMA STD.20ABEC1ABEC3ABEC5ABEC7
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