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High precision angular contact ball bearings

7211HG1UJ84 - SNR

7211HG1UJ84

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 diameter55 mm
D - External diameter100 mm
B - Bearing/Inner ring width21 mm
d1 - External diameter inner ring69 mm
D1 - Inner diameter outer ring85,8 mm
D2 - Inner diameter outer ring93,02 mm
a - Charge load application point29 mm
α - Contact angle25 °
rs - Min fillet radius1,5 mm
r1s - Min fillet radius1 mm
Precision classP4
Mass0,62 kg
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PRODUCT PERFORMANCE
C - Dynamic load52,9 kN
C0 - Static load41 kN
Cu - Fatigue limit load2,3 kN
f0 - Coefficient14.757
Axial displacement K Factor0.56
Preload level8
Preload value1,4 kN
Axial rigidity300 N/µm
Radial rigidity588 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed18500 tr/min
N lim - Grease lubrication limit speed12500 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)6,247 Hz
BPFI - Over rolling frequency on inner (60 rpm)8,753 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,273 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,637 Hz
FTF - Rotational frequency - cage (60 rpm)0,416 Hz
ABUTMENT
da min - Min shoulder diameter IR63,5 mm
db min - Min IR shoulder diameter63,5 mm
Da max - Max shoulder diameter OR91,5 mm
Db max - Max OR shoulder diameter91,5 mm
r1a - Max fillet radius1 mm
ra max - Max shaft & housing fillet radius1,5 mm
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