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Scale and public service of SKF double row cylindrical roller bearings
Source: China Bearing Network Time: 2014-08-29
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The standard dimensions of the bearing are in accordance with the ISO 15 specification of 1998. The diameter and outer diameter of most drawings of the bearing fit the diameter series of this specification.
The specifications of the NN30 and NNU49 series of SKF double row cylindrical roller bearings are generally produced according to the high precision required by the machine tool according to the public service level SP. The suffix SP is included in the type of these bearings in the table. Some bearings can be used according to the contract. Higher precision supply of grade UP specifications. Provides detailed information on demand.
Other specifications of the bearing except for special orders; are produced at the general level of public service. The drawing number bearing is generally produced with scale accuracy P6 and rotation accuracy P5.
The practical values ​​correspond to the general level, level 6 and level 5 of the ISO 492 specification in 2002. The public service level SP indicates the scale accuracy corresponding to the public service level P5 and the rotation precision P4. The public service level UP is more accurate; The scale accuracy is about P4; the rotation accuracy is higher than P4.
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