Rubber sealvsmetal sealbearing

NMB part number symbol : ZZThe shield is secured to the outer ring with a snap ring.No contact between shield bore and circumference of inner ring land.

Doshieldedbearings need to be greased

NMB part number symbol : KK or HHJIS part number symbol : ZZThe shield is secured directly to the outer ring.No contact between shield bore and circumference of inner ring land.

Shielded vs sealed bearingchart

Compared to the open type, the shielded and sealed bearing types provide better protection from contamination and grease leakage.They are selected based on the application type and environment.

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Common symbol : SS and DDRubber seal with steel insert is secured directly to the outer ring.The DD type seals contact the circumference of the inner ring, the SS type seals do not contact the inner ring.DD has highly sealed, but torque to rotate is higher than non-contact enclosures.