507X4-7/16BU REXNORD bearings PLB6879FD5;507X4-7/16BU,507X4-7/16BU weight,507X4-7/16BU size,507X4-7/16BU parameter WRM12 weight,WRM12 size,WRM12 parameter,P4B-IP-208RE weight,P4B-IP-208RE size,P4B-IP-208RE parameter,507X4-7/16BU weight,507X4-7/16BU size,507X4-7/16BU parameter, drawing, ...