Tolerances :
| housing / bore | D = | N7 for sizes 6203 - 6207 |
| N6 for sizes 6208 | ||
| shaft | d = | n6 |
Keyway specifications according to DIN 6885, Bl. 3 (P9) with back clearance, for size 6207 to DIN 6885 Bl. 1.
Machine parts, in which freewheel clutches are pressed in or on can be of ferrous or nonferrous material. If you considered using nonferrous material please contact our technical staff first.
For pressed in or on rings, no retainers are necessary for axial or radial security. During mounting do not apply pressure to bearing balls. Even the keywayed inner rings of series FKN 62.. have to be press fitted for proper function. Press fit will be achieved by using the recommended tolerance of the shaft "n6"!
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).
The RS-seals used for these clutches seal against dust and grease lubrication. Oil lubrication and merging into liquids are not possible. The "open" and "2RS" style are the standard program. With these types it is not necessary to specify clutch engagement direction.
Engagement direction
With the "RS" style it is necessary to specify clutch engagement direction. A single seal is always mounted next to the clutch, never next to the ball bearing.
Engagement direction "right":
Engagement direction of the inner ring,
view on to the seal
Engagement direction "left":
When ordering a freewheel clutch with opposite engagement, the suffix "L" must be added to the type number.
Lubrication:
GMN clutches (except for sealed clutches of series FK 62.. and FKN 62..) are shipped rust protected - not lubricated. Sealed ball bearing clutches "RS" and "2RS" are shipped grease lubricated for life-time.
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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