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High precision angular contact ball bearings

7220CG1UJ74 - SNR

7220CG1UJ74

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 diameter100 mm
D - External diameter180 mm
B - Bearing/Inner ring width34 mm
d1 - External diameter inner ring127,3 mm
D1 - Inner diameter outer ring153 mm
D2 - Inner diameter outer ring168 mm
a - Charge load application point36 mm
α - Contact angle15 °
rs - Min fillet radius2,1 mm
r1s - Min fillet radius1,1 mm
Precision classP4
Mass3,23 kg
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PRODUCT PERFORMANCE
C - Dynamic load148 kN
C0 - Static load127 kN
Cu - Fatigue limit load5,7 kN
f0 - Coefficient14.56
Axial displacement K Factor1.06
Preload level7
Preload value0,92 kN
Axial rigidity138 N/µm
Radial rigidity784 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed12000 tr/min
N lim - Grease lubrication limit speed7500 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)5,773 Hz
BPFI - Over rolling frequency on inner (60 rpm)8,227 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,343 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,672 Hz
FTF - Rotational frequency - cage (60 rpm)0,412 Hz
ABUTMENT
da min - Min shoulder diameter IR112 mm
db min - Min IR shoulder diameter112 mm
Da max - Max shoulder diameter OR168 mm
Db max - Max OR shoulder diameter168 mm
r1a - Max fillet radius1 mm
ra max - Max shaft & housing fillet radius2 mm
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