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C4. C3. C2，CM. C9NA，. C0NA. Roll neck of steel mill. Loose fit for both inner and outer rings. C2. C3，C4. 8.2.1 Criteria for selecting bearing internal clearance.
Bearing internal clearance (fig 1) is defined as the total distance through which one bearing ring can be moved relative to the other in the C4, Greater than C3.
C3, Internal clearance ＞ CN, For bearing rings with press fits and large temperature differential between inner and outer ring. C4, Internal clearance ＞ C3. C5