Double Row TNA SeriesNA72212 Bearing

Double row tapered roller bearing TNA bearings are non-adjustable, double-row bearings that are supplied with built-in clearance.This results in a specifified mounting setting range satisfactory for specifific applications. They are similar to type TDO, but the  inner-ring front faces are extended so that they abut, which eliminates the need for the  inner-ring spacer of a TDO bearing.They can be used at either fixed positions or allowed to float in the housing bore to compensate for shaft expansion.


For desired fifitting practice and resultant mounted setting  range information, contact your VAFEM engineer. If a closer control of mounted setting range is required, type TDO bearing assembly is recommended.

VAFEM (Shang Hai) Bearing Technology Co.,Ltd
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Double Row TNA Series

Dimension and Parameters

Bearing Dimensions(mm/in.)
d :2.125
D :4.875
T :3.0625
C :2.1875
Load Ratings(N/lbf)
Dynamic(1)
C1(2) :64600
Factors(2)
e :0.74
Y1 :0.92
Y2 :1.36
Dynamic(3)
C90 :9620
Ca90 :12100
C90(2) :16800
Factors(2)
K :0.79
Part Number
Inner :NA72212
Outer :72488D
Bearing Dimensions(mm/in.)
Shaft
Max. Shaft Fillet Radius
R(4) :0.09
Backing Shoulder Dia.
db :2.91
Housing
Max. Housing Fillet Radius
r(4) :0.06
Backing Shoulder Dia.
Da :4.53
Pin(mm/in.)
Ka :
Kb :
Bearing Weight(kg/lbs.) :9
Part Number:
d:
D:
B:
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