Spindle ball bearings - bearing series
For selecting from GMN bearing range, please click here to get in contact with our Application engineers.
Bearing series S..
- GMN standard spindle ball bearing
- Non-separable type
Bearing series SM ...
- Geometry of inner ring modified for extremely high speeds
- Reduced load rating and static rigidity compared to bearing series S...
- Equal or higher service life as with bearing series S... due to lower friction
- Non-separable type
Bearing series KH ...
- Optimized spindle ball bearing for extremely high speeds and increased service life
- Reduced load rating and static rigidity compared to bearing series SM
- Sealed, with for-life lubrication or open for oil lubrication
- Non-separable type
Bearing series SH ...
A special design of series SM...
- Optimized oil feeding, one land on inner ring
- Non-separable type
- Available only on request
Bearing series SMA ...
A special design of series SM...
- Oil feed via outer ring
- Optimized for oil-minimized lubrication and extremely high speeds
- High degree of reliability in operation is ensured by force-feed lubrication
- Non-separable type
- Available only on request
Bearing series SMI ...
A special design of series SM...
- Oil feed via inner ring
- Optimized for oil-minimized lubrication and extremely high speeds
- High degree of reliability in operation is ensured by force-feed lubrication
- Non-separable type
- Available only on request
Separable type
- Simple mounting due to separate installation of inner and outer ring (when necessary)
- Balancing of rotating parts with installed inner ring
- A defined axial clearance of the bearing system is possible
Bearing series BHT ...
- The cage retains the balls in the outer ring, which means the balls do not fall out when the one-land inner ring is removed.
- The one-piece cage is guided on both lands of the outer ring.
- The contact conditions are the same as with bearing series SM...
- Due to the ball retaining design of the cage, the ball complement is less than for bearing series SM...
Bearing series BNT ...
- Corresponds essentially to bearing series BHT...
- However the contact conditions are the same as for bearing series S...
- Due to the ball retaining design of the cage, the ball complement is less than for bearing series S...
Special designs
Bearing series ...X, and BHT ...X
- Non-separable type
- High precision ball bearings of extra wide design with shields on both sides for high speed and grease lubrication are used in drilling, milling or grinding spindles for special operating conditions.
- The non-contact shields form a labyrinth seal together with the recess in the inner ring.
- The bearing friction is scarcely influenced by this. Due to the labyrinth seal, the lubricant is retained in the bearing so that the bearing can achieve long running times, corresponding to operating speeds, with only one grease filling (for-life lubrication).
Bearing series S ... TB, SN ... TA
With grease lubricated spindle ball bearings and cage guided on one land, cage vibration can be generated at critical speed ranges.
Apart from the TXM cage proven in the case of cage vibrations, there are two alternatives:
- Use of a TB cage with bearing series S.
The cage is guided on the inner ring by two lands.
Reduced load rating and static rigidity compared to spindle bearings with TA or TXM cage. - Use of a TA cage with bearing series SN
The cage is guided on the outer ring by two lands. The curvature is the same as that of series SM.
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