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Radial Internal Clearance
Apr 03, 2017

The radial internal clearance of a ball bearing affects life, noise, vibration and heat generation.  It is important to select the appropriate internal clearance for each application.

The three types of internal clearance of a ball bearing are radial clearance, axial clearance and moment clearance.

Radial internal clearance decreases when a ball bearing is fitted to either a shaft or housing with interference. Radial internal clearance is a specified value in the NMB or JIS part number, as shown in the tables below.

The fits and temperature affect the radial internal clearance.  Therefore, actual application conditions need to be reviewed when radial internal clearance is selected.

Radial Clearance (Gr)


 

 

 

Figure 1

The displacement generated by moving the outer ring in the radial direction while securing the inner ring.

 

 Axial Clearance (Gt)

 

 

 

 

Figure 2

The displacement generated by moving the inner ring in the axial direction while securing the outer ring.

Moment Clearance (θ)