Double Row TNA SeriesNA329121 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 :12
D :17.246
T :6.375
C :4.875
Load Ratings(N/lbf)
Dynamic(1)
C1(2) :432000
Factors(2)
e :0.33
Y1 :2.04
Y2 :3.03
Dynamic(3)
C90 :64300
Ca90 :36500
C90(2) :112000
Factors(2)
K :1.76
Part Number
Inner :NA329121
Outer :329173CD
Bearing Dimensions(mm/in.)
Shaft
Max. Shaft Fillet Radius
R(4) :0.25
Backing Shoulder Dia.
db :13.11
Housing
Max. Housing Fillet Radius
r(4) :0.06
Backing Shoulder Dia.
Da :16.3
Pin(mm/in.)
Ka :0.88
Kb :0.44
Bearing Weight(kg/lbs.) :161.91
Part Number:
d:
D:
B:
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