Ball bearing freewheel clutch units

GMN ball bearing freewheel clutch units are suitable for low and medium torque requirements. The FK, FKN and FKNN series have an integrated ball bearing and are also optionally available pre-lubricated with grease and seal rings (2RS models). GMN ball bearing freewheel clutch units without seals are suitable for either oil or grease lubrication. All GMN ball bearing freewheel clutch units can be used as indexing clutches, backstops or as overrunning clutches.

FL_M30a_KUFL_822x550

Ball bearing freewheel clutch unit FK (2RS)

Freewheel clutches from the FK (2RS) series are ball bearing freewheel clutch units with keyway connection. They are optionally available sealed on both sides (FK 2RS) or without a seal (FK).

 

Characteristics:
  • Dimensions: dimensions in accordance with bearing series 62 (DIN 625)
  • Width: 12 / 14 / 15 / 16 / 17 / 18 mm
  • Operating temperature: max. 140 °C; higher temperatures on request
  • Operation temperature design 2RS with RS seals: max. 110 °C
  • Lubrication: oil or grease lubrication; delivered with corrosion protection
  • Lubrication series FK 2RS with seals: operative lifetime grease lubrication
fk-6206-2-rs_2
FL_Detail_KLFL_2

Components

  • Insert element

    FE 400 Z2

  • Raceways

    Bearing steel, hardened and ground

  • Inner ring

    Press fit

  • Outer ring

    Press fit

  • Ball bearing

    integrated

  • Roller bearing

  • Lubrication

Lifetime grease lubrication*

  • Seal

    RS seals*

* Series FK 2RS (with RS seals)

17 - 20 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Torque
Tnom
[Nm]
Rotation speed
nmax
[rpm]
Dynamic load capacity
Cdyn.
[N]
Static load capacity
Cstat.
[N]
Edge radius
r
[mm]
Weight
kg
[kg]
Item no.
Data sheets
FK 6203
17
40
12
53
10800
6245
3441
1
0.0746
301065
FK 6203 RS
17
40
12
53
3700
6245
3441
1
0.0754
301079
FK 6204
20
47
14
60
7500
6869
4268
1,5
0.123
301068
FK 6204-2RS
20
47
14
60
3200
6869
4268
1,5
0.124
301087
FK 6304-2RS
20
52
15
104
2800
7448
5146
1,5
0.169
301098

25 - 30 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Torque
Tnom
[Nm]
Rotation speed
nmax
[rpm]
Dynamic load capacity
Cdyn.
[N]
Static load capacity
Cstat.
[N]
Edge radius
r
[mm]
Weight
kg
[kg]
Item no.
Data sheets
FK 6205
25
52
15
104
5400
7448
5146
1,5
0.145
301070
FK 6205-2RS
25
52
15
104
2800
7448
5146
1,5
0.15
301092
FK 6206
30
62
16
148
5100
7859
6066
1,5
0.23
301074
FK 6206-2RS
30
62
16
148
2400
7859
6066
1,5
0.231
301103

35 - 40 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Torque
Tnom
[Nm]
Rotation speed
nmax
[rpm]
Dynamic load capacity
Cdyn.
[N]
Static load capacity
Cstat.
[N]
Edge radius
r
[mm]
Weight
kg
[kg]
Item no.
Data sheets
FK 6207
35
72
17
265
3700
8902
7819
1,5
0.333
301077
FK 6207-2RS
35
72
17
265
1900
8902
7819
1,5
0.341
301108
FK 6208
40
80
18
267
3700
8849
7752
1,5
0.45
301078
FK 6208-2RS
40
80
18
267
1900
8849
7752
1,5
0.4483
301110

Ball bearing freewheel clutch unit FKN (2RS)

Freewheel clutches from the FK (2RS) series are ball bearing freewheel clutch units with a keyway on the inner ring and keyway connection on the outer ring. They are optionally available sealed on both sides (FK 2RS) or without a seal (FK).

Characteristics:
  • Dimensions: dimensions per bearing series 62 (DIN 625)
  • Width: 12 / 14 / 15 / 16 / 17 / 18 mm
  • Operating temperature: max. 140 °C; higher temperatures on request
  • Operating temperature design 2RS with RS seals: max. 110 °C
  • Lubrication: oil or grease lubrication; delivered with corrosion protection
  • Lubrication series FKN 2RS with seals: operative lifetime grease lubrication
fkn-6206-2rs_3
FL_Detail_KLFL_2

Components

  • Insert element*

    FE 400 Z2

  • Raceways

    Bearing steel, hardened and ground

  • Inner ring

    Keyway per DIN 6885, Sheet 3 (Sizes 6203-6206)
    Keyway per DIN 6885, Sheet 1 (Sizes 6207-6208)
    Tolerance: P9 with back clearance

  • Outer ring

    Press fit

  • Ball bearing

    integrated

  • Roller bearing

  • Lubrication

Lifetime grease lubrication*

  • Seal

    RS seals*

* Series FKN 2RS (with RS seals)

17 - 25 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Edge radius
r
mm
Keyway width IR
b
mm
Keyway depth IR
t
mm
Torque
Tnom
[Nm]
Rotation speed
nmax
[rpm]
Dynamic load capacity
Cdyn.
[N]
Static load capacity
Cstat.
[N]
Weight
kg
[kg]
Item no.
Data sheets
FKN 6203
17
40
12
1
5
1,2
53
10800
6245
3441
0.0732
301112
FKN 6203 RS
17
40
12
1
5
1,2
53
3700
6245
3441
0.0747
301114
FKN 6204
20
47
14
1,5
6
1,6
60
7500
6869
4268
0.1186
301120
FKN 6204-2RS
20
47
14
1,5
6
1,6
60
3200
6869
4268
0.1192
301125
FKN 6205-2RS
25
52
15
1,5
8
2
104
2800
7448
5146
0.148
301130
FKN 6205
25
52
15
1,5
8
2
104
5400
7448
5146
0.143
301131

30 - 40 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Edge radius
r
mm
Keyway width IR
b
mm
Keyway depth IR
t
mm
Torque
Tnom
[Nm]
Rotation speed
nmax
[rpm]
Dynamic load capacity
Cdyn.
[N]
Static load capacity
Cstat.
[N]
Weight
kg
[kg]
Item no.
Data sheets
FKN 6206-2RS
30
62
16
1,5
8
2
148
2400
7859
6066
0.2295
301143
FKN 6206
30
62
16
1,5
8
2
148
5100
7859
6066
0.2287
301145
FKN 6207
35
72
17
1,5
10
3,3
265
3700
8902
7819
0.328
301156
FKN 6207-2RS
35
72
17
1,5
10
3,3
265
1900
8902
7819
0.336
301158
FKN 6208
40
80
18
1,5
12
3,3
267
3700
8849
7752
0.45
301161
FKN 6208-2RS
40
80
18
1,5
12
3,3
267
1900
8849
7752
0.45
301163

Ball bearing freewheel clutch unit FKNN (2RS)

Freewheel clutches from the FKNN (2RS) series are ball bearing freewheel clutch units with keyway connection on the inner ring and rectangular groove on the outer ring. They are optionally available sealed on both sides (FKN 2RS) or without a seal (FKN).

 

Characteristics:
  • Dimensions: dimensions in accordance with bearing series 62 (DIN 625)
  • Width: 12 / 14 / 15 / 16 / 18 mm
  • Operating temperature: max. 140 °C; higher temperatures on request
  • Operating temperature design 2RS with RS seals: max. 110 °C
  • Lubrication: Oil or grease lubrication; delivered with corrosion protection
  • Lubrication series 2RS with seals: operative lifetime grease lubrication
fknn-6206-2rs_2
FL_Detail_KLFL_2

Components

  • Insert element*

    FE 400 Z2

  • Raceways

    Bearing steel, hardened and ground

  • Inner ring

Keyway per DIN 6885, Sheet 3 (Sizes 6203-6206)
Keyway per DIN 6885, Sheet 1 (Sizes 6207-6208)
Tolerance: P9 with back clearance

  • Outer ring

    Rectangular groove

  • Ball bearing

    integrated

  • Roller bearing

  • Lubrication

    Lifetime grease lubrication*

  • Seal

    RS seals*

* Series FKNN 2RS (with RS seals)

17 - 20 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Edge radius
r
mm
Keyway width
b
mm
Keyway depth
t
mm
Rectangular groove width
bOR
mm
Rectangular groove depth
tOR
mm
Torque
Tnom
[Nm]
Rotation speed
nmax
[rpm]
Dynamic load capacity
Cdyn.
[N]
Static load capacity
Cstat.
[N]
Weight
kg
[kg]
Item no.
Data sheets
FKNN 6203
17
40
12
1
5
1,2
Nut AR b=2
Nut AR t=1
53
10800
6245
3441
0.0746
305989
FKNN 6203 RS
17
40
12
1
5
1,2
Nut AR b=2
Nut AR t=1
53
3700
6245
3441
0.0754
305990
FKNN 6204
20
47
14
1,5
6
1,6
Nut AR b=3
Nut AR t=1,5
60
7500
6869
4268
0.1186
305992
FKNN 6204-2RS
20
47
14
1,5
6
1,6
Nut AR b=3
Nut AR t=1,5
60
3200
6869
4268
0.122
305993
FKNN 6304-2RS
20
52
15
1,5
6
1,6
Nut AR b=6 mm
Nut AR t=2 mm
104
2800
7448
5146
0.1523
306137

25 - 40 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Edge radius
r
mm
Keyway width
b
mm
Keyway depth
t
mm
Rectangular groove width
bOR
mm
Rectangular groove depth
tOR
mm
Torque
Tnom
[Nm]
Rotation speed
nmax
[rpm]
Dynamic load capacity
Cdyn.
[N]
Static load capacity
Cstat.
[N]
Weight
kg
[kg]
Item no.
Data sheets
FKNN 6205
25
52
15
1,5
8
2
Nut AR b=6
Nut AR t=2
104
5400
7448
5146
0.147
305995
FKNN 6205-2RS
25
52
15
1,5
8
2
Nut AR b=6
Nut AR t=2
104
2800
7448
5146
0.1523
305996
FKNN 6206
30
62
16
1,5
8
2
Nut AR b=6
Nut AR t=2
148
5100
7859
6066
0.2287
305998
FKNN 6206-2RS
30
62
16
1,5
8
2
Nut AR b=6
Nut AR t=2
148
2400
7859
6066
0.2348
305999
FKNN 6208
40
80
18
1,5
12
3,3
Nut AR b=10
Nut AR t=3
267
3700
8849
7752
0.45
306004
FKNN 6208-2RS
40
80
18
1,5
12
3,3
Nut AR b=10
Nut AR t=3
267
1900
8849
7752
0.45
306005

Specific installation instructions for ball bearing freewheel clutch units

Installation instructions for the FK (2RS), FKN (2RS) AND FKNN (2RS) series

  • Installation tolerances

Shaft n6; hub N7

 

  • Mating parts

Hardening and grinding of the mating parts are not necessary. Thoroughly clean (grease free) the mating parts in the vicinity of the freewheel clutches as well as the freewheel clutch’s rings before making the press fit.

 

  • Bearing

The freewheel clutch includes a ball bearing. Additional external bearing support is not necessary.

 

  • Press fit pressure

Press fit pressure must not be applied to the balls.

 

  • Clamping direction

The arrow on the inner ring designates the inner ring’s clamping direction.

 

  • Seals for the series 2RS

The employed RS seals reliably seal out grease and dust but are not suitable protection against the presence of liquids. Series FK 6203-RS, FKN 6203-RS and FKNN 6203-RS have a single RS seal disc.

Fr_Baureihen_FK_550x550
Series FK 
Fr_Baureihen_FKN_550x550
Series FKN 
Fr_Baureihen_FKNN_550x550
Series FKNN