NAXK12 Combined Needle Roller With Thrust Ball Bearing 12x21x23mmNKX12 Combined Needle Roller With Thrust Ball NKX12 Combined Needle Roller With Thrust Ball Bearing 12x21x23mm NAXK12 Combined Needle Roller With Thrust Ball Bearing 12mm x 21mm x 23mm VXB Bearing NAXK12 combined Needle roller bearings with a thrust bearing. They can accommodate both radial and axial loads. They are particularly suitable for applications where other types of locating bearing arrangements occupy too much space, or where the axial loads