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 combinations indicating the NSK bearing type, boundary dimensions, dimensional and running accuracy, internal clearance, and other related specifications. NSK bearing nomenclature consist of basic numbers and supplementary symbols. The boundary dimensions of commonly used NSK bearings

NSK bearing numbers nomenclature consist of a basic number and supplementary symbols. The basic NSK number indicates the NSK bearing series (type) and the width and diameter series, as shown below. NSK basic numbers supplementary symbols and the meanings of common numbers and symbols are listed in the table below. The contact angle symbols and other supplementary designations are also shown in the table.

The diagram below shows how the order codes are made up. There should be spaces separating the individual sections of an order code from one another.

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