Right to choose and purchase of bearings, NSK bearings in particular low noise, can reduce the cost, so as to achieve the best value for money.
　　1, giving priority to low-noise production of bearings. In the bearing during use, some machines have clear requirements for noise is required, such as by low noise standards: eight roller bearings, models from N309 to N322; three ball bearings, they kind of bore diameter from 2.5mm to 60mm, as well as with Zl, Z2 and Z3 three suffixes.
　　For this type of single row radial ball bearings and cylindrical roller bearings on used powered machine bearings, are clearly defined. If other machines can use the bearings, then give priority to the applications of these bearings on another machine, because the price of these bearings is relatively cheap, and generally coincides on the size and type, to make use of these two types of bearings.
　　2, quieter bearings other bearings sort. From friction coefficient, and maintained frame material of different, and precision high or not and volume size to comparison, bearing in equipment in the using occurred of noise from low to high respectively sort for: ball bearing < roll child bearing, using entity maintained frame NSK bearing < using stamping maintained frame of bearing, scroll body precision more high of bearing < scroll body precision more low of bearing, small bearing < large bearing.
　　After more contrast, we in the process of purchasing of NSK bearings, comparative analysis can be carried out according to the specific situation, in accordance with the categories of satisfaction with the classification principles, if not, choose Sort according to replace the bearing noise. If can be used strictly in accordance with the above order of bearings, NSK bearings must be able in the device properly, quietly.



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