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High precision angular contact ball bearings

7222CG1UJ74 - SNR

7222CG1UJ74

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 diameter110 mm
D - External diameter200 mm
B - Bearing/Inner ring width38 mm
d1 - External diameter inner ring140,7 mm
D1 - Inner diameter outer ring169,6 mm
D2 - Inner diameter outer ring186,5 mm
a - Charge load application point40 mm
α - Contact angle15 °
rs - Min fillet radius2,1 mm
r1s - Min fillet radius1,1 mm
Precision classP4
Mass4,53 kg
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PRODUCT PERFORMANCE
C - Dynamic load174 kN
C0 - Static load160 kN
Cu - Fatigue limit load6,8 kN
f0 - Coefficient14.492
Axial displacement K Factor1.03
Preload level7
Preload value1,08 kN
Axial rigidity150 N/µm
Radial rigidity861 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed10500 tr/min
N lim - Grease lubrication limit speed6800 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)5,753 Hz
BPFI - Over rolling frequency on inner (60 rpm)8,247 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,252 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,626 Hz
FTF - Rotational frequency - cage (60 rpm)0,411 Hz
ABUTMENT
da min - Min shoulder diameter IR122 mm
db min - Min IR shoulder diameter122 mm
Da max - Max shoulder diameter OR188 mm
Db max - Max OR shoulder diameter188 mm
r1a - Max fillet radius1 mm
ra max - Max shaft & housing fillet radius2 mm
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