NSK bearing designation | nomenclature | prefixes | suffixes
NSK bearing designation | nomenclature | prefixes | suffixes Order codes for NSK bearings are made up of a combination of letters and numbers. This alphanumeric combination denotes the type, size and structure of the NSK bearing. A distinction is made between the basic designation and any suffixes and/or prefixes within each code. The basic designation of NSK bearing indicates the NSK bearing type and the bore size. These basic designations are defined in the German DIN 623 standard and the relevant ISO standard. For most NSK bearing types, the basic designation numbers, but some are alphanumeric. Prefixes and suffixes denote special modifications, for example, if the internal clearance or accuracy deviate from the norm. The use of prefixes and suffixes is only partially standardised. Suffixes differ the most, with the various bearing manufacturers using different codes for certain modifications. Please refer to NSK bearing cross-reference. NSK bearing numbers are alphanumeric combin