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High precision angular contact ball bearings

71910HVUJ84 - SNR

71910HVUJ84

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 diameter50 mm
D - External diameter72 mm
B - Bearing/Inner ring width12 mm
d1 - External diameter inner ring56,8 mm
D1 - Inner diameter outer ring65,2 mm
D2 - Inner diameter outer ring68,02 mm
a - Charge load application point20 mm
α - Contact angle25 °
rs - Min fillet radius0,6 mm
r1s - Min fillet radius0,3 mm
Precision classP4
Mass0,129 kg
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PRODUCT PERFORMANCE
C - Dynamic load14 kN
C0 - Static load12,7 kN
Cu - Fatigue limit load0,72 kN
f0 - Coefficient16.534
Axial displacement K Factor0.6
Preload level8
Preload value0,37 kN
Axial rigidity179 N/µm
Radial rigidity355 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed26000 tr/min
N lim - Grease lubrication limit speed17000 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)9,509 Hz
BPFI - Over rolling frequency on inner (60 rpm)11,491 Hz
BSF - Over rolling frequency on rolling element (60 rpm)9,521 Hz
BRF - Rotational frequency – rolling element (60 rpm)4,761 Hz
FTF - Rotational frequency - cage (60 rpm)0,453 Hz
ABUTMENT
da min - Min shoulder diameter IR54,5 mm
db min - Min IR shoulder diameter54,5 mm
Da max - Max shoulder diameter OR67,5 mm
Db max - Max OR shoulder diameter67,5 mm
r1a - Max fillet radius0,3 mm
ra max - Max shaft & housing fillet radius0,6 mm
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