Model Number    309726DA                        Original  
Number of Row Doube                                 Type     Angular Contact Ball Bearing  
Bore  d（mm）  34                                        Outer   D（mm）  64   
Width  B（mm） 37                                       Mass W（kg） 0.44    
Overall Width  T（mm）                               Chamfer（Rmin）     
rotate speed（r/min）