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High precision angular contact ball bearings

7204CG1UJ74 - SNR

7204CG1UJ74

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 diameter20 mm
D - External diameter47 mm
B - Bearing/Inner ring width14 mm
d1 - External diameter inner ring28,5 mm
D1 - Inner diameter outer ring38,55 mm
D2 - Inner diameter outer ring42,19 mm
a - Charge load application point11 mm
α - Contact angle15 °
rs - Min fillet radius1 mm
r1s - Min fillet radius0,6 mm
Precision classP4
Mass0,105 kg
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PRODUCT PERFORMANCE
C - Dynamic load15,5 kN
C0 - Static load8,9 kN
Cu - Fatigue limit load0,48 kN
f0 - Coefficient13.268
Axial displacement K Factor1.74
Preload level7
Preload value0,085 kN
Axial rigidity39 N/µm
Radial rigidity210 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed49000 tr/min
N lim - Grease lubrication limit speed31000 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)4,241 Hz
BPFI - Over rolling frequency on inner (60 rpm)6,759 Hz
BSF - Over rolling frequency on rolling element (60 rpm)3,999 Hz
BRF - Rotational frequency – rolling element (60 rpm)2 Hz
FTF - Rotational frequency - cage (60 rpm)0,386 Hz
ABUTMENT
da min - Min shoulder diameter IR25,5 mm
db min - Min IR shoulder diameter25,5 mm
Da max - Max shoulder diameter OR41,5 mm
Db max - Max OR shoulder diameter41,5 mm
r1a - Max fillet radius0,6 mm
ra max - Max shaft & housing fillet radius1 mm
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