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High precision angular contact ball bearings

71902CVUJ84 - SNR

71902CVUJ84

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 diameter15 mm
D - External diameter28 mm
B - Bearing/Inner ring width7 mm
d1 - External diameter inner ring18,7 mm
D1 - Inner diameter outer ring24,3 mm
D2 - Inner diameter outer ring25,92 mm
a - Charge load application point6 mm
α - Contact angle15 °
rs - Min fillet radius0,3 mm
r1s - Min fillet radius0,3 mm
Precision classP4
Mass0,015 kg
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PRODUCT PERFORMANCE
C - Dynamic load4,5 kN
C0 - Static load2,44 kN
Cu - Fatigue limit load0,15 kN
f0 - Coefficient12.331
Axial displacement K Factor2.24
Preload level8
Preload value0,07 kN
Axial rigidity30 N/µm
Radial rigidity153 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed81000 tr/min
N lim - Grease lubrication limit speed53000 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)5,341 Hz
BPFI - Over rolling frequency on inner (60 rpm)7,659 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,245 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,623 Hz
FTF - Rotational frequency - cage (60 rpm)0,411 Hz
ABUTMENT
da min - Min shoulder diameter IR17,5 mm
db min - Min IR shoulder diameter17,5 mm
Da max - Max shoulder diameter OR25,5 mm
Db max - Max OR shoulder diameter25,5 mm
r1a - Max fillet radius0,3 mm
ra max - Max shaft & housing fillet radius0,3 mm
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