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Roller bearing specification
We are always prepared to tailor your bearings, if their dimensions are based upon modified standard roller bearings.
Our overview Bearing types and design versions does therefore not mean that our capacities are restricted to
the products listed. Kugel- and Rollenlagerwerk Leipzig GmbH specialize more and more in the production of special
bearings and in meeting built-to-order requests.
Each roller bearing of the Kugel- and Rollenlagerwerk Leipzig GmbH standard product range has an unique specification
code according to standard DIN 623-Teil1.
This code includes prefix and suffix letter codes, basic letter codes, and additional codes.
The figure below shows the legend of such a code string:
Prefix
letter codes
Single component
Basic letter codes Suffix letter
codes
Size series Bearing bore Inner design
Bearing type Size series
Prefix letter codes outer/inner ring
Width
Height
series
Diameter
series
External
design
Precision
Bearing clearance:
Heat treatment
Additional
letter codes
Tailored specifications
The following outer/inner ring prefix letter codes are used with the roller bearings of the actual KRW assortment:
R Outer ring with roller sets including cage, Example RNU2238E.M2A
L Inner ring of a cylindrical roller bearing Example LNUP1064E:
GS Body washer of an axial cylindrical roller bearing Example GS81140
WS Shaft washer of an axial cylindrical roller bearing Example WS81244
K Cage with cylinder rollers assembled Example K81124
Basic letter codes
The basic letter code specifies the following information:
Bearing type specified by digits or letters (or combinations):
2 Double row spherical roller bearing Example 22338EA
3 Tapered roller bearing Example 32044.MPB
6 Radial deep groove ball bearing Example 6018M
7 Angular contact ball bearing Example 7240B
8
N
Axial cylindrical roller bearing Example 81144M
1)
8
1)
.
Axial cylindrical roller bearing
Single row cylindrical roller bearing
Example
Example NU1064E.MA3
NN 1)
Double-row cylindrical roller bearing Example NNU4924M
Q 1) Four point bearing Example Q314MP
1) See KRW delivery programme for more bearing type information.
Dimension series, combined acc. to DIN 616 from width (height) series and
diameter series.
18 Dimension series 18 Example 61856M
19 Dimension series 19 Example 619/530M 19/530M 19
02 Dimension series 02 Example NU226E.M
11 Dimension series 11 Example 81156M
Other dimension series may be combined acc. to standard DIN 616.
Bearing bore
The KRW standard assortment uses 2 specification codes:
Diameters d < 500 mm use a bore digit, which is a fifth of the bore diameter in mm, diameters d ≥ 500 mm
specify the diameter directly in mm.
24 Bore number 24 means d = 120 mm Example NU224E.M3
530 bore diameter d = 530 mm Example 618/530M
KRW 85