... tool spindle bearings Agular contact ball bearings High degree of running accuracy GB/T307.1-2005/ISO492-2002 Dalian Bearing DesignationsPrincipal Dimensions (mm ... precision angular contact ball bearing(1) precision:P2, P4, P5, P6, P0(2) process range:from id 35 mm to OD 1600 mm(3) series ... :71900, 7000,7200, 7300, 71800 series(4) structure:AC, C, B , with contact angle 25,15,40 ...