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SKF - Rolling Bearings

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Designation system<br />

Group 4<br />

4.1 4.2 4.3 4.4 4.5 4.6<br />

Group 4.6: Other variants<br />

PEX <strong>SKF</strong> Explorer bearing, used only when same-sized conventional and <strong>SKF</strong> Explorer<br />

bearings are available<br />

VA301 Bearing for railway vehicle traction motors<br />

VA305 VA301 + special inspection routines<br />

VA350 Bearing for railway axleboxes<br />

VA380 Bearing for railway axleboxes in accordance with EN 12080, class 1<br />

VA3091 VA301 + external surfaces of the outer ring are coated with<br />

aluminium oxide<br />

VC025 Bearing with special wear-resistant raceways for applications in heavily contaminated<br />

environments<br />

VQ015 Inner ring with crowned raceway for increased permissible misalignment<br />

5<br />

Group 4.5: Lubrication<br />

Group 4.4: Stabilization<br />

S1<br />

S2<br />

Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F)<br />

Bearing rings heat stabilized for operating temperatures ≤ 250 °C (480 °F)<br />

Group 4.3: Bearing sets, matched bearings<br />

DR<br />

TR<br />

QR<br />

Two bearings matched to one set<br />

Three bearings matched to one set<br />

Four bearings matched to one set<br />

Group 4.2: Accuracy, clearance, preload, quiet running<br />

CN<br />

C2<br />

C3<br />

C4<br />

C5<br />

Normal radial internal clearance; only used together with an additional letter that<br />

identifies a reduced or displaced clearance range<br />

H Reduced clearance range corresponding to the upper half of the actual clearance<br />

range<br />

L Reduced clearance range corresponding to the lower half of the actual clearance<br />

range<br />

M Reduced clearance range corresponding to the middle half of the actual clearance<br />

range<br />

The above letters are also used together with the clearance classes C2, C3, C4 and C5,<br />

e.g. C2H<br />

Radial internal clearance smaller than Normal<br />

Radial internal clearance greater than Normal<br />

Radial internal clearance greater than C3<br />

Radial internal clearance greater than C4<br />

Group 4.1: Materials, heat treatment<br />

HA1<br />

HA3<br />

HB1<br />

HN1<br />

L4B<br />

L5B<br />

L7B<br />

Case-hardened inner and outer rings<br />

Case-hardened inner ring<br />

Bainite-hardened inner and outer rings<br />

Inner and outer rings with special surface heat treatment<br />

Bearing rings and rollers black oxidized<br />

Rollers black oxidized<br />

Inner ring and rollers black oxidized<br />

603

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