The dimensions of GMN ball bearing freewheel clutches are according to deep groove ball bearings DIN 625 bearing sizes 62. The double sealed "2RS" type shows exactly the same dimensions.
With our ball bearing freewheel clutches we combine a bearing-like configuration of inner and outer ring (made from ball bearing steel AISI E 52100) balls and retainer with a narrow, space saving insert element. Please note that the load capacity of the unit is smaller than that of the original bearing. The "RS" seals correspond to bearing "RD" seals. They are not capable to sealing against liquids. For the size 6203 sealing is possible on just one side to keep the original width of the bearing.
For proper function of the complete unit the correct gap size is inevitable. Please note that the correct gap size will be achieved when the clutch is pressed onto the shaft and into the housing with the correct tolerances only.
After installation a radial clearance between C2 and C5 will be reached. To create a clearance of C2 you should produce your shaft at the highest point and your housing at the lowest point of the allowed tolerances.
The stated torque capacities in the data sheets show the optimum values. The torque is transmitted reliably when the clutch is mounted within the specified tolerances. Please note that the tolerances of the keywayed inner rings of series FKN are specified to achieve some press fit. The reason for this is that the keyway alone would not be able to transmit the full torque.
Open GMN ball bearing clutches are rust protected - not lubricated. Sealed ball bearing clutches "RS" and "2RS" are grease lubricated for life time. Please note also our indications for lubrication.
A single RS-seal is mounted next to the insert element. Please see mounting instructions for the definition of the engagement direction.
open type (no seals): 140°C
RS and 2-RS-sealed type: 110°C
The company Stringbike enters the market with a revolutionary new drive system - provided with GMN-freewheel-clutches.
Download area 