RSH is a contact seal built around a pressed steel insert, with the rubber bonded to it. The insert keeps the lip round and evenly loaded as bore size grows, which is why RSH appears on larger bearings where a plain rubber lip would deflect and leak. RSH seals one side; 2RSH seals both.
Sealing force comes from the elasticity of the rubber and from the garter arrangement behind the lip. On a 25 mm bore the geometry holds the lip concentric by itself. On a 120 mm bore the same lip section is long enough to deflect under load and to ovalise with temperature, so the contact pressure around the circumference stops being uniform — and the seal leaks at one point rather than all round. Bonding the rubber to a steel insert restores the stiffness.
The two are functionally identical at small sizes. RSH appears where the seal has to survive shaft deflection, misalignment or a heavier grease fill: large pumps, mill duty, heavy conveyors and rollers with long shafts. If the drawing says 2RSH, fitting a generic 2RS is possible but usually a downgrade in sealing consistency.
| Full designation | RSH = one side, 2RSH = both sides |
|---|---|
| Construction | Rubber lip bonded to a pressed steel insert |
| Contact | Yes |
| Typical bore range | Above roughly 60 mm, where plain lips deform |
| Temperature | −40 to +120 °C (NBR) |
| Speed | 60–70% of the open bearing |
| Equivalent duty | Same as 2RS1, heavier carcass |
| Interchange | Any brand's contact seal of the same size |
| Criterion | RSH / 2RSH | 2RS1 | Generic 2RS |
|---|---|---|---|
| Carcass | Pressed steel insert | Pressed steel insert | Varies |
| Typical bore range | 60 mm and above | All sizes | All sizes |
| Lip concentricity at large bore | Good | Good | Depends on maker |
| Temperature | 120 °C | 120 °C | 100–120 °C |
| Speed | 60–70% of open | 60–70% of open | 60–70% of open |
| Availability | SKF, FAG, NSK on request | Universal | Universal |
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Read →RSH is a seal on one side only; 2RSH is the same seal on both sides. Bearings are almost always supplied 2RSH.
At small sizes, yes — the construction is comparable. At 60 mm bore and above, a generic 2RS lip may seal less consistently; prefer a reinforced-seal equivalent from the same brand family.
Not as a catalogue suffix. High-temperature rubber seals are ordered by material specification rather than by a code, so state the temperature and ask for an FKM variant explicitly.
Usually heat, not wear. NBR at sustained 100–120 °C takes a permanent set and loses contact pressure. Check the running temperature before replacing the bearing — the new one will do the same.
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