Bearing seals: 2RS, ZZ & open designs
Understand closure codes, compare sealed and shielded variants, and check the full manufacturer description before selecting a bearing.
Choose the closure, then compare exact models
| Recorded closure | Search meaning | Important limitation |
|---|---|---|
| Sealed | Recorded contact and non-contact seal designs | Not every result is an exact 2RS construction |
| ZZ / 2Z | Recorded two-shield designs | Not a liquid-tight seal or a universal high-speed approval |
| Open | No integral closure recorded | Needs the specified external sealing and lubrication system |
Explore every topic in this module
Bearing seal code chart: RS, 2RS, Z, ZZ, LLB & LLU
Use closure families to narrow the catalogue, then read the brand-specific specification. Similar-looking codes are not a universal suffix interchange table.
Read and apply →Sealed versus open bearings: lubrication & protection
An open bearing relies on its surroundings for contamination control and lubricant supply. An integral closure changes that arrangement but does not make every bearing waterproof.
Read and apply →Contact versus non-contact bearing seals
A seal may touch a ring or operate with a small gap. Compare the actual design rather than assuming all rubber-looking closures have the same friction or protection.
Read and apply →608 2RS vs 608 ZZ: compare the full bearing specification
608 is a useful size example, not a universal recommendation. Compare the loaded 608 variants by closure, precision, clearance and lubrication.
Read and apply →Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.