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High precision angular contact ball bearings

7212HG1UJ74 - SNR

7212HG1UJ74

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 diameter60 mm
D - External diameter110 mm
B - Bearing/Inner ring width22 mm
d1 - External diameter inner ring76 mm
D1 - Inner diameter outer ring95,5 mm
D2 - Inner diameter outer ring103,05 mm
a - Charge load application point31 mm
α - Contact angle25 °
rs - Min fillet radius1,5 mm
r1s - Min fillet radius1 mm
Precision classP4
Mass0,81 kg
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PRODUCT PERFORMANCE
C - Dynamic load64 kN
C0 - Static load50,5 kN
Cu - Fatigue limit load2,8 kN
f0 - Coefficient14.737
Axial displacement K Factor0.54
Preload level7
Preload value0,56 kN
Axial rigidity214 N/µm
Radial rigidity455 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed17000 tr/min
N lim - Grease lubrication limit speed11000 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)6,241 Hz
BPFI - Over rolling frequency on inner (60 rpm)8,759 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,246 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,623 Hz
FTF - Rotational frequency - cage (60 rpm)0,416 Hz
ABUTMENT
da min - Min shoulder diameter IR68,5 mm
db min - Min IR shoulder diameter68,5 mm
Da max - Max shoulder diameter OR101,5 mm
Db max - Max OR shoulder diameter101,5 mm
r1a - Max fillet radius1 mm
ra max - Max shaft & housing fillet radius1,5 mm
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