... GCr15, GCr15SiMn 4:High-end technology Thrust ball bearings, single direction 51224 1:Single direction thrust ball bearings, as their name suggests, can accommodate ... , 52300, 52400, 53200, 53300, 53400, 54200, 54300, 54400 series standard types and 511/500 512/500 510/500 593/500 ... /630 511/670 510/670 572/710 592/710 series non-standard series. 3:Material: GCr15, GCr15SiMn4:Outside diameter: 100-780 ...