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.
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)
(serviceable even in very particel contaminated environments)
|Water resistance||Not suitable||Not suitable||
(serviceable even if liquids are splashed on bearing)
|Operating temperature||-10 to 110°C||-10 to 110°C||-10 to 100°C|