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GFK models are sliding clutches built into 59 series ball bearings.
This design provides high torque capability for the smallest outside diameter.
It is a bearing supported type and is grease lubricated at the factory.
Oil bath lubrication is also possible if the clutch is first cleaned with a suitable solvent to remove the old grease.
Regardless of the type of lubrication, seals must be provided as shown in the diagram below.
Torque transmission must be ensured by press-fit components on a rigid housing with tolerance R6 and a shaft with tolerance p5.
The full press fit on the GFK must not exceed the internal clearance of the models listed in the Internal Clearance column.