spacer spacer spacer spacer
Kaydon Bearings spacer spacer


customer service


Kaydon part number codes

Reali-Slim MM® metric bearings

Standard and optional Kaydon Reali-Slim MM® metric bearings are marked for complete identification with a 9- or 10-digit part number. Positions 1–9 identify materials, size, type, separator type, and precision. Position 10 (optional) identifies non-standard internal fit, either preload or clearance. Custom and proprietary bearings cannot be identified by code, and are marked only with a 9-digit number.


Log in to access 3D models,
CAD files, and engineering software
Forgot password?  |  Register

Position 1 2 3 4 5 6 7 8 9 10
Nomenclature Material Bore (mm) Width (mm) Type Separator Precision Internal fit
Example K 0 8 0 0 8 X P 0 K
spacer spacer
Position 1—Material
J AISI 52100 steel with two seals—Nitrile rubber
K AISI 52100 steel
L AISI 52100 steel and Endurakote® plating
N Endurakote® plating
S AISI 440C stainless steel
W AISI 440C stainless steel with two seals—Nitrile rubber


Position 7—Bearing type
A Angular contact
C Radial contact
X Four-point contact


Position 8—Separator
P Standard formed ring, "snap-over" type
R Standard formed ring, circular pocket type


Position 9—Precision
0 Kaydon precision class 1 (ABEC 1F) standard


Position 10—Bearing internal fit
A .0000 to .0127 mm clearance
K .0000 to .0127 mm preload
L .0000 to .0254 mm preload
Z Other clearance or preload not specified above
Empty Standard internal fitup if not specified
spacer spacer