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High precision angular contact ball bearings

7218HG1UJ74 - SNR

7218HG1UJ74

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 diameter90 mm
D - External diameter160 mm
B - Bearing/Inner ring width30 mm
d1 - External diameter inner ring113,9 mm
D1 - Inner diameter outer ring136,4 mm
D2 - Inner diameter outer ring149,7 mm
a - Charge load application point44 mm
α - Contact angle25 °
rs - Min fillet radius2 mm
r1s - Min fillet radius1 mm
Precision classP4
Mass2,24 kg
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PRODUCT PERFORMANCE
C - Dynamic load116 kN
C0 - Static load100 kN
Cu - Fatigue limit load4,95 kN
f0 - Coefficient14.9
Axial displacement K Factor0.5
Preload level7
Preload value1,16 kN
Axial rigidity302 N/µm
Radial rigidity642 N/µm
Tmin - Min operating temperature-30 °C
Tmax - Max operating temperature120 °C
N lim - Oil lubrication limit speed11500 tr/min
N lim - Grease lubrication limit speed7600 tr/min
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)6,291 Hz
BPFI - Over rolling frequency on inner (60 rpm)8,709 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,478 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,739 Hz
FTF - Rotational frequency - cage (60 rpm)0,419 Hz
ABUTMENT
da min - Min shoulder diameter IR100 mm
db min - Min IR shoulder diameter100 mm
Da max - Max shoulder diameter OR150 mm
Db max - Max OR shoulder diameter150 mm
r1a - Max fillet radius1 mm
ra max - Max shaft & housing fillet radius2 mm
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