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High precision angular contact ball bearings

7021CVUJ74 - SNR

7021CVUJ74

High precision angular contact ball bearing, laminated resin cage centred on outer ring

In the ball bearing and high precision bearing ranges, the high precision angular contact ball bearing solves the maximum reliability constraints with increased performance in terms of rigidity, speed, capacity and precision. This bearing is recommended for demanding applications in terms of precision such as machine tool spindles. NTN is getting sub-ranges dedicated to requirements of speed, sealing, specific greasing, etc.

Documentation

Product information

PRODUCT DEFINITION
BrandSNR
d - Internal diameter105 mm
D - External diameter160 mm
B - Bearing/Inner ring width26 mm
d1 - External diameter inner ring122,8 mm
D1 - Inner diameter outer ring142,2 mm
D2 - Inner diameter outer ring149,84 mm
a - Charge load application point31 mm
α - Contact angle15 °
rs - Min fillet radius2 mm
r1s - Min fillet radius1 mm
Precision classP4
Mass1,61 kg
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PRODUCT PERFORMANCE
C - Dynamic load82,5 kN
C0 - Static load85,8 kN
Cu - Fatigue limit load4 kN
f0 - Coefficient16.02
Axial displacement K Factor0.89
Preload level7
Preload value0,44 kN
Axial rigidity123 N/µm
Radial rigidity717 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed13000 tr/min
N lim - Grease lubrication limit speed8700 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)9,727 Hz
BPFI - Over rolling frequency on inner (60 rpm)12,273 Hz
BSF - Over rolling frequency on rolling element (60 rpm)8,235 Hz
BRF - Rotational frequency – rolling element (60 rpm)4,118 Hz
FTF - Rotational frequency - cage (60 rpm)0,442 Hz
ABUTMENT
da min - Min shoulder diameter IR115 mm
db min - Min IR shoulder diameter115 mm
Da max - Max shoulder diameter OR150 mm
Db max - Max OR shoulder diameter150 mm
r1a - Max fillet radius1 mm
ra max - Max shaft & housing fillet radius2 mm
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