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71904HVUJ74 - SNR

71904HVUJ74

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-SNR is getting under ranges dedicated to requirements of speed, sealing, specific greasing, etc.

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Specs

PRODUCT DIMENSIONS

Internal diameter d 20 mm
External diameter D 37 mm
Bearing/Inner ring width(B) 9 mm
External diameter inner ring d1 25,1 mm
Inner diameter outer ring D1 31,9 mm
Inner diameter outer ring D2 34,02 mm
Charge load application point a 11 mm
Contact angle α 25 °
Min fillet radius rs 0,3 mm
Min fillet radius r1s 0,3 mm
Coefficient f0 14.266
Precision class P4
Mass 0,036 kg
Brand SNR
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PRODUCT PERFORMANCE

Dynamic load, C 6,9 kN
Static load, C0 4,4 kN
Fatigue limit load, Cu 0,27 kN
Axial displacement K Factor 0.88
Preload level 7
Preload value 0,055 kN
Axial rigidity 62 N/µm
Radial rigidity 132 N/µm
Min operating temperature, Tmin -30 °C
Max operating temperature, Tmax 120 °C
Nlim (oil) 56000 tr/min
Nlim (grease) 37000 tr/min
Characteristic cage frequency, FTF 0,424 Hz
Characteristic rolling element frequency, BSF 5,848 Hz
Characteristic outer ring frequency, BPF0 6,364 Hz
Characteristic inner ring frequency, BPFI 8,636 Hz

ABUTMENT

Min shoulder diameter IR da min 22,5 mm
Min IR shoulder diameter (db min) 22,5 mm
Max shoulder diameter OR Da max 34,5 mm
Max OR shoulder diameter (Db max) 34,5 mm
Maxi fillet radius r1a 0,3 mm
Max shaft & housing fillet radius ra max 0,3 mm
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