NK needle roller bearings are supplied without the inner ring for instances where a mating bearing surface already exists or an inner ring is to be used & has the benefit of flanges in the outer race to compensate for small misalignments and small side loads. Sizes range from NK16/16 - NK28/30 & we also stock the NKS22 Precision ground Needle Roller Bearing. Other sizes may also be available but may not be displayed please contact us if you require a size not displayed on our shop.