Angular contact ball bearings, four-point contact ball bearings QJ 1256 N2MA
Bearing number : QJ 1256 N2MA
Size (mm) : 280x500x90
Brand : SKF
Bore Diameter (mm) : 280
Outer Diameter (mm) : 500
Width (mm) : 90
Bearing dimensions and specification in SKF catalogue:
d - 280 mm
D - 500 mm
B - 90 mm
d1 - - 365 mm
D1 - - 415 mm
a - 390 mm
h - 12.5 mm
b - 15 mm
r0 - 2.5 mm
r1,2 - min. - 5 mm
da - min. - 302 mm
Da - max. - 478 mm
ra - max. - 4 mm
Basic dynamic load rating - C - 728 kN
Basic static load rating - C0 - 1460 kN
Fatigue load limit - Pu - 31.5 kN
Reference speed - 1300 r/min
Limiting speed - 2000 r/min
Calculation factor - ka - 0.9
Calculation factor - e - 1.34
Calculation factor - X - 0.54
Calculation factor - Y0 - 0.44
Calculation factor - Y1 - 0.47
Calculation factor - Y2 - 0.81
Mass bearing - 82 kg
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