At a glance
RS / one seal
A seal protects one side while the other side may remain open to the housing.
Use when one face needs protection and the opposite face has an intentional lubricant supply or protected enclosure.
2RS / two seals
Both faces have seals, usually enclosing a grease charge.
Use when both faces need protection and the design relies on retained grease.
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 / one seal | 2RS / two seals |
|---|---|---|
| Protected sides | One | Two |
| Opposite face | Usually open; inspect the exact design | Second seal |
| Lubrication path | Can be accessible from the open side | Closures may block an external lubricant path |
| Mounting orientation | Seal side orientation matters | Generally symmetrical closure arrangement |
| Friction | One contacting lip if contact sealed | Two contacting lips if contact sealed |
| Naming | RS, RS1 or other maker-specific code | 2RS, 2RS1 or other maker-specific code |
Before you choose
- Inspect which side carries a snap-ring groove and which side is sealed.
- Single-seal and double-seal variants can use different grease fills.
- Do not assume an unlisted RS variant exists for every 2RS model.
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
Does 2RS mean twice the load rating?
No. The number describes the count of sealed sides in common designation systems.
Can I use two seals with an oil supply?
Check that oil can reach the rolling contact; the seals may prevent the intended flow.
Reference basis & limits
- SKF — Bearing maintenance handbook: designation suffixes
- NSK — Single-row deep groove ball bearings: features and closure designations
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.