Tolerances:
| outer ring with press fit: | housing D = H6 | |
| inner ring with press fit (FP/FPD): | shaft d = h5 | |
| inner ring with keyway (FN/FND): | shaft d = js6(k5) |
Keyway specifications according to DIN 6885, Bl.1 (P9) with back clearance.
Machine parts, in which freewheel clutches are pressed in or on, can be made of ferrous or of nonferrous material. If you considered using nonferrous material please contact our technical staff first.
For pressed in or on freewheel clutch rings no retainers are necessary for axial or radial security. The inner rings with keyway (type FN and FND) have to be secured in the axial direction only, if the pressed on outer machine part (gear or lever) is not axially secure, when mounting freewheel clutches with bearings do not apply pressure to bearing balls.
After installation a radial clearance between C2 and C5 is achieved. To create a clearance of C2 the shaft should be produced at the highest point and the housing at the lowest point of the recommended tolerances.
Attention: Please take care for total cleaning of freewheel rings and mating parts before press fitting (no grease particles left in the press fit area).
Lubrication:
Series type FPD 400 and FND 400 are shipped oil lubricated for lifetime.
Series type FN 400 and FP 400 are shipped rust protected - not lubricated.
For further information please see our indications of lubrication.
The company Stringbike enters the market with a revolutionary new drive system - provided with GMN-freewheel-clutches.
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