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Kaydon part number codes

Ultra-Slim® bearings

Standard and optional Kaydon Ultra-Slim® extra thin-section 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.


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Position 1 2 3 4 5 6 7 8 9 10
Nomenclature Material Bore (mm) Width (mm) Type Separator Precision Internal fit
Example S 1 1 0 0 3 C S 0 K
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Position 1—Material
S AISI 440C stainless steel races and balls (standard for series)


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


Position 8—Separator
S Spacer balls
F Full complement of load balls


Position 9—Precision
0 Kaydon standard precision class


Position 10—Bearing internal fit
A .000 to .130 mm clearance
C .013 to .025 mm clearance
E .025 to .510 mm clearance
K .000 to .013 mm preload
M .013 to .025 mm preload
Empty Standard internal fitup if not specified
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