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NTN SEAL STRUCTURE AND FEATURES TYPE DESIGNATION


Z, ZZ:  

The sealed V-slot around the inner ring creates an air and/or grease pocket which increases
the labyrinth effect.
This is a non-contact, low-friction torque type bearing assembly, which can be used effectively
for general protection.

LB, LLB:

Both sides of the seal edge have a circular concaved surface which creates several narrowwide
gaps along the V-shaped groove of the inner ring’s sealed surface. The unique design
ensures a perfect labyrinth effect.
This non-contact, low friction bearing assembly requires very little torque and is highly resistant
to dust build-up.


LU, LLU:

The seal edge forms a double-lip. The inner lip touches the V-slot side of the inner ring’s seal
surface. There is a slight gap between the inner ring and the outer lip which produces the labyrinth
effect. Even if friction causes the inner lip to wear, the outer lip constricts around the inner
ring to compensate, and thus constantly preserving the perfect sealing effect.
Due to the fact that it is a contact type seal bearing, the torque will be a little greater but the
seal will provide the optimum protection from dust penetration.



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