Model Number     1944X1D                     Original 305272D  
Number of Row Double                           Type  Angular Contact Ball Bearing     
Bore  d（mm）    220                               Outer   D（mm）   309.5  
Width  B（mm）  76                                 Mass W（kg）  17.7   
Overall Width  T（mm）                           Chamfer（Rmin）     
rotate speed（r/min）