SKF four-row cylindrical roller bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes
In addition to their designation, four-row cylindrical roller bearings are also identified by the design variant/features. Some of these features may not be part of the bearing designation, but are always part of the design variant/features
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3 |
Suffixes - Internal design |
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A, B, C, D, E |
Deviating or modified internal design. Combinations of these letters are also used, e.g. DC. The actual modification is specific to the individual bearing and is given on the drawing. |
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EC |
Optimized internal design incorporating more and/or larger rollers and with modified roller end / flange contact |
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4 |
Suffixes - External design (seals, snap ring groove etc.) |
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G |
Helical groove in inner ring bore |
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K |
Tapered bore, taper 1:12 |
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K30 |
Tapered bore, taper 1:30 |
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5 |
Suffixes - Cage design |
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FA |
Machined steel cage, outer ring centred |
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M |
Machined brass cage, roller centred |
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MA(S) |
Machined brass cage, outer ring centred. The S indicates a lubrication groove in the guiding surface |
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6.1 |
Suffixes - Materials, heat treatment |
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HA1 |
Case-hardened inner and outer rings |
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HA2 |
Case-hardened outer ring |
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HA3 |
Case-hardened inner ring |
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HA4 |
Case-hardened inner and outer rings and rollers |
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HA5 |
Case-hardened rollers |
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HA6 |
Case-hardened outer ring(s) and rollers |
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HA7 |
Case-hardened inner ring(s) and rollers |
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HB1 |
Bainite-hardened inner and outer rings |
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HB2 |
Bainite-hardened outer ring(s) |
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HB3 |
Bainite-hardened inner ring(s) |
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6.2 |
Suffixes - Accuracy, clearance, preload, quiet running |
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CN |
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
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H = Reduced clearance range corresponding to the upper half of the actual clearance range
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L = Reduced clearance range corresponding to the lower half of the actual clearance range
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M = Reduced clearance range corresponding to the middle half of the actual clearance range
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P = Displaced clearance range comprising the upper half of the actual clearance range plus the lower half of the next larger clearance range
The above letters are also used together with the clearance classes C2, C3, C4 and C5, e.g. C2H |
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C2 |
Radial internal clearance smaller than Normal |
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C3 |
Radial internal clearance greater than Normal |
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C4 |
Radial internal clearance greater than C3 |
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C5 |
Radial internal clearance greater than C4 |
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P5 |
Dimensional and geometrical tolerances to class P5 |
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P6 |
Dimensional and geometrical tolerances to class P6 |
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P53 |
P5 + C3 |
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6.3 |
Suffixes - Bearing sets, matched bearings (n.a.) |
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6.4 |
Suffixes - Stabilization |
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S1 |
Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F) |
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S2 |
Bearing rings heat stabilized for operating temperatures ≤ 250 °C (480 °F) |
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6.5 |
Suffixes - Lubrication |
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W20 |
Lubrication holes in the outer ring(s) |
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W33 |
Annular groove and lubrication holes in the outer ring(s) |
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6.6 |
Suffixes - Other variants |
|
VA907 |
Sealed bearing |
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VJ202 |
Set of two matched double row bearings |
oterh articles about SKF roller bearings
