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SKF - Rolling Bearings

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7 Tapered roller bearings<br />

Designation system<br />

Group 1 Group 2 Group 3 /<br />

Prefixes<br />

E2. <strong>SKF</strong> Energy Efficient bearing<br />

J<br />

Metric bearing following the ABMA designation system (ANSI/ABMA<br />

Standard 19.2)<br />

T Metric bearing in accordance with ISO 355<br />

Basic designation<br />

Refer to Bearing designations († page 820)<br />

Suffixes<br />

Group 1: Internal design<br />

B<br />

Steep contact angle<br />

Group 2: External design (seals, snap ring groove etc.)<br />

R<br />

T..<br />

X<br />

Flanged outer ring<br />

A number immediately following the T identifies the total width of matched bearings, arranged<br />

back-to-back or in tandem.<br />

Boundary dimensions changed to conform to ISO<br />

Group 3: Cage design<br />

J..<br />

TN9<br />

TNH<br />

Stamped steel cage, roller centred. A number following the J indicates a different cage design.<br />

Glass fibre reinforced PA66 cage, roller centred<br />

Glass fibre reinforced PEEK cage, roller centred<br />

Group 4.1: Materials, heat treatment<br />

HA1<br />

HA3<br />

HN1<br />

HN3<br />

Case-hardened inner and outer rings<br />

Case-hardened inner ring<br />

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

Inner ring with special surface heat treatment<br />

822

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