NSK N series metric thin section bearings

NB7 Type

An NSK original, the NB7 type is the thinnest deep groove ball bearing. The minimal space required for the bearing facilitates downsizing of equipment.

68 and 69 Types

These are NSK thin deep groove ball bearings available in open and sealed types. NSK bearings with a snap ring are also available. The 68 and 69 types are low maintenance and they facilitate the simple design of bearing surroundings.

Features

Low frictional and irregular torque ensure highly efficient power transmission and smooth rotating performance.

The high accuracy of the bearings enables excellent high-speed performance.

Features of shielded and sealed bearings

The table below compares the features of shielded, non-contact sealed and contact sealed bearings.

Type	Shielded type(zz)	non-contact rubber sealed type(VV)	Contact rubber sealed type(DDU)
Torque	Low	Low	Higher than ZZ and VV due to seal contact
Speed capability	Good	Good	Limited by seal contact
Grease sealing effectiveness	Good	Better than ZZ	A little better than VV
Resistance to foreign particles and debris	Good	Better than ZZ (serviceable in moderately particle contaminated environments)	Best (serviceable even in very particel contaminated environments)
Water resistance	Not suitable	Not suitable	Good (serviceable even if liquids are splashed on bearing)
Operating temperature	-10 to 110°C	-10 to 110°C	-10 to 100°C