Sprag Clutch, Ball Bearing Freewheel Clutch Unit FKNN 6204 | GMN Bearing USA

Sprag Clutch, Ball Bearing Freewheel Clutch Unit FKNN 6204

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FKNN 6204
Part NumberFKNN 6204
TypeBall Bearing Freewheel Clutch Unit
SpringZ (Tension)
SealedOptional (None or 2RS)
LubricationOil or Grease
Inner Ring KeywayYes
Outer Ring KeywayYes
Integrated Ball BearingYes
Integrated Roller BearingNo

Shaft & Housing Tolerances

Shaft Tolerancen6
Housing ToleranceN7
Shaft & Housing Chamfer1mm × 15°

Geometrical Data

Bore Diameterd [mm]20
Outer DiameterD [mm]47
WidthW [mm]14
Edge Radiusr [mm]1.5
Inner Ring Keyway Widthb [mm]6
Inner Ring Keyway Deptht [mm]1.6
Outer Ring Keyway Widthbor [mm]3
Outer Ring Keyway Depthtor [mm]1.5
Weight [kg]0.12


Nominal TorqueT [N*m]60
Nominal TorqueT [ft*lb]44.3
Max. Static Radial LoadCstat [N]4268
Max. Dynamic Radial LoadCdyn [N]6869
Max. Indexing Frequency [Hz]10
Max. Speed - Unsealed3n [RPM]7500
Max. Speed - Sealedn [RPM]3200
Max. Temp. Unsealed4 [°C]140
Max. Temp. Sealed [°C]110


  1. The stated speed and torque ratings are contingent on utilizing specified tolerances, correct installation techniques, and operating temperature and load conditions below the specified maximums. If specific applications differ, please consult GMN USA engineers.
  2. The stated RPM value is for the maximum freewheel rotational speed for the sprags, not the shaft or housing. High freewheel rotational speeds can produce centrifugal forces that can cause the sprags to lift off from frictional contact, therefore creating an opportunity for improper engagement and potential slip. The sprag RPM must be below the listed value before engagement occurs. The actual sprag freewheel speed is difficult to determine because the sprags are driven by frictional forces from the race(s) and lubrication. Theoretically there is no maximum rotational speed in the driving direction; the inner race, sprags, and outer race rotate as one unit unaffected by centrifugal forces. Please consult GMN USA engineers with high RPM applications that approach or exceed the stated RPM rating.
  3. The stated temperature rating is for an injection molded cage. The maximum temperature rating is 170°C for a steel cage.

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