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Flexible Couplings - Bellows type, zero backlash, BKL series. (Part Numbers)

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; 60; 90

Part Number
BKL/500/44/46
BKL/500/44/47
BKL/500/44/48
BKL/500/44/49
BKL/500/44/50
BKL/500/44/51
BKL/500/44/52
BKL/500/44/53
BKL/500/44/54
BKL/500/44/55
BKL/500/44/56
BKL/500/44/57
BKL/500/44/58
BKL/500/44/59
BKL/500/44/60
BKL/500/45/45
BKL/500/45/46
BKL/500/45/47
BKL/500/45/48
BKL/500/45/49
BKL/500/45/50
BKL/500/45/51
BKL/500/45/52
BKL/500/45/53
BKL/500/45/54
BKL/500/45/55
BKL/500/45/56
BKL/500/45/57
BKL/500/45/58
BKL/500/45/59
BKL/500/45/60
BKL/500/46/46
BKL/500/46/47
BKL/500/46/48
BKL/500/46/49
BKL/500/46/50
BKL/500/46/51
BKL/500/46/52
BKL/500/46/53
BKL/500/46/54
BKL/500/46/55
BKL/500/46/56
BKL/500/46/57
BKL/500/46/58
BKL/500/46/59
BKL/500/46/60
BKL/500/47/47
BKL/500/47/48
BKL/500/47/49
BKL/500/47/50
BKL/500/47/51
BKL/500/47/52
BKL/500/47/53
BKL/500/47/54
BKL/500/47/55
BKL/500/47/56
BKL/500/47/57
BKL/500/47/58
BKL/500/47/59
BKL/500/47/60
BKL/500/48/48
BKL/500/48/49
BKL/500/48/50
BKL/500/48/51
BKL/500/48/52
BKL/500/48/53
BKL/500/48/54
BKL/500/48/55
BKL/500/48/56
BKL/500/48/57
BKL/500/48/58
BKL/500/48/59
BKL/500/48/60
BKL/500/49/49
BKL/500/49/50
BKL/500/49/51
BKL/500/49/52
BKL/500/49/53
BKL/500/49/54
BKL/500/49/55
BKL/500/49/56
BKL/500/49/57
BKL/500/49/58
BKL/500/49/59
BKL/500/49/60
BKL/500/50/50
BKL/500/50/51
BKL/500/50/52
BKL/500/50/53
BKL/500/50/54

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	100~less than 500	44	46	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	47	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	48	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	49	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	50	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	51	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	52	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	53	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	54	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	55	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	56	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	57	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	58	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	59	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	44	60	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	45	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	46	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	47	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	48	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	49	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	50	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	51	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	52	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	53	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	54	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	55	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	56	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	57	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	58	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	59	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	45	60	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	46	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	47	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	48	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	49	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	50	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	51	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	52	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	53	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	54	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	55	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	56	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	57	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	58	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	59	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	46	60	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	47	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	48	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	49	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	50	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	51	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	52	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	53	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	54	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	55	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	56	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	57	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	58	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	59	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	47	60	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	48	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	49	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	50	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	51	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	52	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	53	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	54	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	55	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	56	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	57	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	58	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	59	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	48	60	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	49	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	50	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	51	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	52	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	53	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	54	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	55	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	56	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	57	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	58	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	59	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	49	60	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	50	50	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	50	51	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	50	52	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	50	53	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500
1 Piece(s)	21 Days	100~less than 500	50	54	123	114	No Backlash / Low Moment of Inertia	500	8.3	42.5	290	200	500

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

2,728 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

Allowable Torque Range(N•m)
10.01~20.00

20.01~50.00

50.01~100.00

100~less than 500
Clear
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

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

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

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

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
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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Flexible Couplings - Bellows type, zero backlash, BKL series. (Part Numbers)

Basic Information

Configure

Specification/Dimensions

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)

Fit Length (mm)(mm)

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

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

Size

CAD