Sprag Clutch, Freewheel Clutch Insert Element FRN 437 Z | GMN Bearing USA

Sprag Clutch, Freewheel Clutch Insert Element FRN 437 Z

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FRN 437 Z
Part NumberFRN 437 Z
TypeFreewheel Clutch Insert Element
SpringZ (Tension)
With Hardened Steel RingsYes
Inner Ring KeywayYes

Shaft & Housing Tolerances

Shaft Tolerancek5
Housing ToleranceH6
Shaft & Housing Chamfer1mm × 15°

Geometrical Data

Bore Diameterd [mm]15
Outer DiameterD [mm]41
WidthW [mm]12
Inner Ring Keyway Widthb [mm]5
Inner Ring Keyway Deptht [mm]2.3
Weight [kg]0.08


Nominal TorqueT [N*m]154
Nominal TorqueT [ft*lb]113.6
Max. Indexing Frequency [Hz]10
Max. Speed2n [RPM]4800
Max. Operating Temperature3 [°C]140


  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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