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Internal Freewheels FN
Internal Freewheels FN are roller freewheels from Suma precision bearing company without bearing support.
The freewheel is built into the customer housing. This makes compact, space-saving fitting solutions possible.
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Product Detail

Features

Internal Freewheels FN are roller freewheels from Suma precision bearing company without bearing support.

The freewheel is built into the customer housing. This makes compact, space-saving f itting solutions possible.

The freewheels FN are used as:

➧Backstops

➧Overrunning Clutches ➧Indexing Freewheels

Nominal torques up to 3 000 Nm. The faces of both sides of the outer ring are provided with grooves for torque transmission.

Bores up to 60 mm.

Application example

Internal freewheel FN 20 as a backstop, on the drive shaft of running gears on a chain conveyor. In normal operation, the drive shaft drives and the freewheel works in freewheeling oper- ation. The freewheel as a backstop prevents the running gears from being able to run backwards uncontrolled in the event of a fault.

Sizes of Internal Freewheels FN

Different types of Internal Freewheels FN

Freewheel Size

Nominal torque
MN
Nm

Max. speed
Inner ring freewheels/
overruns min-1

Outer ring freewheels/
overruns min-1

Bore d
mm

B
mm

D
mm

E
mm

F
mm

N
mm

P
mm

Weight
kg

FN8

18

2 800

5 400

8

20

37

19

30

6

3,0

0,1

FN12

18

2 800

5 400

12

20

37

19

30

6

3,0

0,1

FN15

50

2 500

5 100

15

30

47

23

37

7

3,5

0,3

FN20

112

1 900

4 350

20

36

62

35

50

8

3,5

0,6

FN25

220

1 550

3 350

25

40

80

40

68

9

4,0

1,1

FN30

410

1 400

3 050

30

48

90

45

75

12

5,0

1,6

FN35

500

1 300

2 850

35

53

100

50

80

13

6,0

2,3

FN40

750

1 150

2 500

40

63

110

55

90

15

7,0

3,1

FN45

1 020

1 100

2 400

45

63

120

60

95

16

7,0

3,7

FN50

1 900

950

2 050

50

80

130

70

110

17

8,5

5,3

FN55

2 000

900

1 900

55

80

140

75

115

18

9,0

6,0

FN60

3 000

800

1 800

60

95

150

80

125

18

9,0

8,4

The maximum transmissible torque is 2 times the specified nominal torque. See page 14 for determination of selection torque.

Keyway according to DIN 6885, page 1 • Tolerance of keyway width JS10.

Mounting
Internal Freewheels FN are without bearing
support. Concentric alignment of inner and
outer ring must be provided by the customer.
The tolerance of the housing bore D must be
ISO H7 or G7 and the tolerance of the shaft must
be ISO h6 or j6.
The outer ring has to be completely enclosed in
a stable housing to transmit the listed torques.

Lubrication
An oil lubrication of the specified quality must
be provided.

Example for ordering
Freewheel size FN 45, standard type:
• FN 45

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