Complex bearing Manufacturer

Complex bearing is comprised of a needle roller bearing of supporting radial load and a thrust bearing for supporting axial load which are assembled integrally.
Comparing with individual use of a radial bearing and a thrust bearing for the same purpose, this complex bearing saves the required installation space and thereby can contribute to making the overall construction of an equipment more compact.

Regarding the dimensional tolerances for radial needleroller bearing, 
Radial internal clearance
The radial internal clearance of Type NKX+IR,
NKXR+IR and NKIA is in accordance with the
interchangeable clearance information 
“Bearing radial internal clearance” . The standard bearings are manufactured subject to
the regular clearances.
The radial internal clearance of Types AXN and ARN is unique to this type, and the clearance value specific to an intended bearing is found in the relevant dimension
Bearing fits
Radial needle roller bearings shall be fitted on shaft/in housing in compliance with Table 2. The thrust bearing washers of Type NKX and NKXR shall be fitted in a housing with hole diameter larger by 0.5mm or over than the washer outer diameter D1 or D2. For Type NKIA and NKIB it is not allowed to make the interference greater than k5/M6
Calculation of rating life
The rating life (L) of any complex bearing is determined as follows. Determine individually the rating life (Lr) of radial needle roller bearing from radial load acting thereon and the rating life (La) of thrust bearing from axial load acting thereon. And determine the rating life (L) from these determined rating lives (Lr, La) using the following
formula.