It's original bearing 6003
Original skf bearing 6003-2RS/C3 deep groove ball bearing
Principal Dimensions
Inside diameter d: 17mm
Outside diameter D: 35mm
Width B: 10mm
Basic Load Ratings
Dynamic: 6,37kn
Static: 3,25kn
Speed Ratings
Reference speed: 45000 r/min
Limiting speed: 28000 r/min
Dimensions mm
d1: 23
D1: 29,2
D2: 31,4
r1,2 min: 0,3