yctoobearing
Enclosure
Shields and seals can be a valuable addition to a bearing. These protective coverings can serve a twofold purpose. They protect the bearing itself from contaminants and protect the application that houses the bearing from leaks. This code indicates the type of shield or seal attached to that particular bearing. If there is a double letter, it means that both sides are enclosed.
SHIELD, SEAL
 ZZ |
 ZZS |
 2RS |
 2RZ |
 2TS |
|---|---|---|---|---|
| ZZ : PRESSED STEEL SHIELD Non-contact shield pressed into outer ring. Very little grease leakage and low ingress of contaminants. |
ZZS : STEEL SHIELD WITH SNAP RING Non-contact shield retained in outer ring. Low ingress of contaminants. Mainly used for smaller or narrower bearings. |
2RS : CONTACT RUBBER SEALRubber seal fitted into outer ring. Light contact with inner ring, retains grease and prevents ingress of external contaminants. |
2RZ : NON-CONTACT RUBBER SEAL Non-contact rubber seal fitted into outer ring, still provides effective sealing. |
2TS : TEFLON SEAL WITH SNAP RINGTeflon seal reinforced with glass fibre is retained in outer ring by snap ring. Low ingress of contaminants. Mainly used for smaller or narrower bearings. Seal can flex to accommodate internal pressure changes. |
Bearing Material -Bearing Closures - Lubricants - Noise - Internal Clearance - Retainer(cage) - Tolerance
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