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Flexible Couplings - Bellows type, zero backlash, BKL series.

R+W

Features
Easy to mount
Light weight and low moment of inertia
High torsional stiffness

Design
Two clamping hubs concentrically mounted to flexible bellows. Brief overloads of up to 1.5x the rated torque are acceptable.

Material
Bellows: high grade stainless steel
Hubs: see table

Advantage
Smooth stable running in highly dynamic and highly precise motion applications

Part Number

Configured Part Number is shown.

Product Specifications
Part Numbers

: 30; 45; 60

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Part Number
BKL/30/10/10
BKL/30/10/11
BKL/30/10/12
BKL/30/10/13
BKL/30/10/14
BKL/30/10/15
BKL/30/10/16
BKL/30/10/17
BKL/30/10/18
BKL/30/10/19
BKL/30/10/20
BKL/30/10/21
BKL/30/10/22
BKL/30/10/23
BKL/30/10/24
BKL/30/10/25
BKL/30/10/26
BKL/30/10/27
BKL/30/10/28
BKL/30/10/29
BKL/30/10/30
BKL/30/10/31
BKL/30/10/32
BKL/30/11/11
BKL/30/11/12
BKL/30/11/13
BKL/30/11/14
BKL/30/11/15
BKL/30/11/16
BKL/30/11/17
BKL/30/11/18
BKL/30/11/19
BKL/30/11/20
BKL/30/11/21
BKL/30/11/22
BKL/30/11/23
BKL/30/11/24
BKL/30/11/25
BKL/30/11/26
BKL/30/11/27
BKL/30/11/28
BKL/30/11/29
BKL/30/11/30
BKL/30/11/31
BKL/30/11/32
BKL/30/12/12
BKL/30/12/13
BKL/30/12/14
BKL/30/12/15
BKL/30/12/16
BKL/30/12/17
BKL/30/12/18
BKL/30/12/19
BKL/30/12/20
BKL/30/12/21
BKL/30/12/22
BKL/30/12/23
BKL/30/12/24
BKL/30/12/25
BKL/30/12/26

Minimum order quantity	Days to Ship	Allowable Torque Range (N•m)	For Shaft Size D1 (mm)	For Shaft Size D2 (mm)	Outer Dia. A (Ø)	Overall Length W (mm)	Feature	Allowable Torque (N•m)	Moment of Inertia (kg･m²)	Fit Length (mm) (mm)	Torsional Stiffness (N-m/rad) (N-m/rad)	Tightening Torque of the Fastening Screw (N-m) (N-m)	Size
1 Piece(s)	21 Days	20.01~50.00	10	10	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	11	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	12	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	13	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	14	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	15	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	16	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	17	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	18	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	19	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	20	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	21	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	22	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	23	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	24	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	25	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	26	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	27	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	28	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	29	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	30	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	31	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	10	32	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	11	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	12	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	13	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	14	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	15	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	16	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	17	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	18	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	19	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	20	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	21	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	22	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	23	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	24	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	25	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	26	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	27	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	28	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	29	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	30	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	31	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	11	32	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	12	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	13	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	14	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	15	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	16	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	17	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	18	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	19	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	20	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	21	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	22	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	23	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	24	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	25	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30
1 Piece(s)	21 Days	20.01~50.00	12	26	56	68	No Backlash / Low Moment of Inertia	30	0.12	26	31	15	30

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Basic Information

Type	Bellows Type	Max. Rotational Speed Range(r/min)	4001~10000	Body Material	Aluminum
Max. Rotational Speed(r/min)	10000	Allowable Angular Misalignment(deg)	1	Allowable Lateral Misalignment Range(mm)	0.02~0.2
Allowable Lateral Misalignment(mm)	0.2	Operating Temperature Range(℃)	-12::212

Configure

277 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

For Shaft Size D1(mm)
0-Pilot Bore

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

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47

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49

50

51

52

53

54

55

56

57

58

59

60

61

62
Clear
For Shaft Size D2(mm)
0-Pilot Bore

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

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29

30

31

32

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37

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44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62
Clear
Outer Dia. A(Ø)
25

32

40

49

56

66

82

110

123
Clear
Overall Length W(mm)
30

40

44

58

68

79

92

109

114
Clear
Feature
No Backlash

Low Moment of Inertia

Unfinished Shaft Bore
Clear
Allowable Torque(N•m)
2

4.5

10

15

30

60

80

150

300

500
Clear
Fit Length (mm)(mm)
10.5

13

21.5

26

28

32.5

41

42.5
Clear
Torsional Stiffness (N-m/rad)(N-m/rad)
1.5

7

9

23

31

72

80

141

157

290
Clear
Tightening Torque of the Fastening Screw (N-m)(N-m)
2.3

4

4.5

8

15

40

70

85

120

200
Clear
Size
2

4.5

10

15

30

60

80

150

300

500
Clear
Allowable Torque Range(N•m)
10.01~20.00

20.01~50.00

50.01~100.00

100~less than 500
Clear
CAD
- 3D
Clear

Days to Ship

All

5 Days or Less

21 Days or Less

66 Days or Less
Clear

Specify Alterations

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

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How can we improve?

Flexible Couplings - Bellows type, zero backlash, BKL series.

Basic Information

Configure

Specification/Dimensions

For Shaft Size D1(mm)

For Shaft Size D2(mm)

Outer Dia. A(Ø)

Overall Length W(mm)

Feature

Allowable Torque(N•m)

Fit Length (mm)(mm)

Torsional Stiffness (N-m/rad)(N-m/rad)

Tightening Torque of the Fastening Screw (N-m)(N-m)

Size

Allowable Torque Range(N•m)

CAD