At a glance
RS contact seal
An elastomer lip makes sliding contact with a bearing-ring surface.
Choose where contamination exclusion is important and the seal's torque and thermal limits are acceptable.
RZ non-contact seal
A reinforced elastomer closure forms a narrow running gap in applicable SKF families.
Choose where low closure friction matters and the environment permits the reduced barrier.
Key differences
Typical design distinctions. The complete designation and current product specification take precedence.
Swipe the table horizontally to see both options →
| What to compare | RS contact seal | RZ non-contact seal |
|---|---|---|
| Lip contact | Contacting in applicable families | Non-contact in applicable families |
| Friction | Sliding contact contributes torque | Very small closure contribution |
| Speed | Seal friction may constrain speed | Can approach open-design speed in specified families |
| Liquid exclusion | Generally stronger for contact designs | Do not assume contact-seal performance |
| Material | Check elastomer and reinforcement | Check elastomer and reinforcement |
| Code scope | Maker and series dependent | Maker and series dependent |
Before you choose
- RZ is not a universal industry code for every brand.
- Do not apply a published SKF RZ speed statement to an unrelated manufacturer's seal.
- Check whether the comparison is one closure or two: RS/RZ versus 2RS/2RZ.
Check the actual model
Search a full designation, inspect its technical data, then compare candidate records. Similar names or dimensions do not guarantee interchangeability.
Filters show recorded catalogue attributes. Open each candidate to confirm its exact specification.
A few things worth clarifying
Is RZ a metal shield?
Not in the referenced SKF design. It is a non-contact sealing arrangement, although both designs avoid a rubbing lip.
Which is best for low starting torque?
Start by comparing measured or specified seal torque. Closure labels alone do not supply an exact torque value.
Reference basis & limits
- SKF — Rolling bearings catalogue: single-row angular contact designs
- SKF — Bearing maintenance handbook: designation suffixes
Independent explanatory content; not a manufacturer endorsement or approval of a replacement. Verify current product data, fits, lubrication and operating conditions before applying a comparison.