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High precision angular contact ball bearings

7214CG1UJ74 - SNR

7214CG1UJ74

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 diameter70 mm
D - External diameter125 mm
B - Bearing/Inner ring width24 mm
d1 - External diameter inner ring88,8 mm
D1 - Inner diameter outer ring106,4 mm
D2 - Inner diameter outer ring115,833 mm
a - Charge load application point25 mm
α - Contact angle15 °
rs - Min fillet radius1,5 mm
r1s - Min fillet radius0,6 mm
Precision classP4
Mass1,1 kg
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PRODUCT PERFORMANCE
C - Dynamic load75,5 kN
C0 - Static load60,3 kN
Cu - Fatigue limit load3,2 kN
f0 - Coefficient14.614
Axial displacement K Factor1.21
Preload level7
Preload value0,46 kN
Axial rigidity97 N/µm
Radial rigidity546 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)5,789 Hz
BPFI - Over rolling frequency on inner (60 rpm)8,211 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,416 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,708 Hz
FTF - Rotational frequency - cage (60 rpm)0,414 Hz
ABUTMENT
da min - Min shoulder diameter IR78,5 mm
db min - Min IR shoulder diameter78,5 mm
Da max - Max shoulder diameter OR116,5 mm
Db max - Max OR shoulder diameter116,5 mm
r1a - Max fillet radius0,6 mm
ra max - Max shaft & housing fillet radius1,5 mm
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