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FAG bearings before mounting, FAG bearing internal clearance referred to as early clearance, clearance is referred to as residual clearance of the bearings after installation. Due to the bearing inner ring after installation expansion due to interference and therefore residual clearance is less than the initial clearance. FAG bearing clearance when running at no load is called the effective clearance, due to the bearing in operation when under the influence of temperature rise and thermal conditions, general high temperature inner ring, within the temperature difference in 5-10-the outer ring, inner ring outer ring-expansion of big expansion, effective clearance is less than the residual clearance of the bearing.
Because clearance is means the one bearing ring relative to the other ring, radial or axial along from one extreme position to another extreme position the amount of movement, clearance of radial clearance and axial clearance can be divided into two kinds. Clearance is an important technical parameters of the bearing, which directly affect the bearing load distribution, vibration, noise, friction, using techniques such as life and mechanical precision performance. Strictly speaking, scroll through the load rating of the bearing is the changes as the size of the clearance, load rating of the bearing samples are recommended values for the effective clearance of the bearing is zero. Clearance is too large, and gives rise to move bearing precision drop, vibration and noise increases, shorten bearing service life; if the clearance is too small, will cause the heat temperature rise, can even lead to bearing killed during the operation. Therefore, depending on the bearing type and conditions of work choose different levels of bearing clearance is very important.
FAG rolling bearings in the bearing load bearing capacity calculation method, there are specific provisions in the rolling bearing technology, generally based on the following steps:
Imposed on FAG rolling bearings 1, determine the size and direction of external loading
2, size and orientation of the external loads, formula as provided by different types of bearings, which counted for equivalent dynamic load.
3, the equivalent dynamic load and speed into the bearing life calculation formula, the calculated bearing life.
FAG subtracted from the theoretical clearance in the bearings are mounted on the shaft or casing caused by interference fit when the rings after the expansion or contraction of clearance, called an "installation clearances"
Addition and subtraction on the installation clearance dimensions internal temperature differences of FAG bearings clearance after variation called "effective clearance"
FAG bearings installed on the machine to bear loads when the rotation clearance, that effective clearance plus the elastic deformation of the bearing load clearance after known as "working clearance" when you are a negative operational clearance, FAG bearing fatigue life the longest, but with a negative clearance increases fatigue life decreased significantly. Therefore, the choice of FAG bearings when travelling, generally suitable operational clearance is zero or slightly positive.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7219CDF NSK | 95 | 170 | 32 |
| 7219BDF NSK | 95 | 170 | 32 |