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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/500/35/37
BKL/500/35/38
BKL/500/35/39
BKL/500/35/40
BKL/500/35/41
BKL/500/35/42
BKL/500/35/43
BKL/500/35/44
BKL/500/35/45
BKL/500/35/46
BKL/500/35/47
BKL/500/35/48
BKL/500/35/49
BKL/500/35/50
BKL/500/35/51
BKL/500/35/52
BKL/500/35/53
BKL/500/35/54
BKL/500/35/55
BKL/500/35/56
BKL/500/35/57
BKL/500/35/58
BKL/500/35/59
BKL/500/35/60
BKL/500/36/36
BKL/500/36/37
BKL/500/36/38
BKL/500/36/39
BKL/500/36/40
BKL/500/36/41
BKL/500/36/42
BKL/500/36/43
BKL/500/36/44
BKL/500/36/45
BKL/500/36/46
BKL/500/36/47
BKL/500/36/48
BKL/500/36/49
BKL/500/36/50
BKL/500/36/51
BKL/500/36/52
BKL/500/36/53
BKL/500/36/54
BKL/500/36/55
BKL/500/36/56
BKL/500/36/57
BKL/500/36/58
BKL/500/36/59
BKL/500/36/60
BKL/500/37/37
BKL/500/37/38
BKL/500/37/39
BKL/500/37/40
BKL/500/37/41
BKL/500/37/42
BKL/500/37/43
BKL/500/37/44
BKL/500/37/45
BKL/500/37/46
BKL/500/37/47
BKL/500/37/48
BKL/500/37/49
BKL/500/37/50
BKL/500/37/51
BKL/500/37/52
BKL/500/37/53
BKL/500/37/54
BKL/500/37/55
BKL/500/37/56
BKL/500/37/57
BKL/500/37/58
BKL/500/37/59
BKL/500/37/60
BKL/500/38/38
BKL/500/38/39
BKL/500/38/40
BKL/500/38/41
BKL/500/38/42
BKL/500/38/43
BKL/500/38/44
BKL/500/38/45
BKL/500/38/46
BKL/500/38/47
BKL/500/38/48
BKL/500/38/49
BKL/500/38/50
BKL/500/38/51
BKL/500/38/52
BKL/500/38/53
BKL/500/38/54

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	35	37	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	35	38	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	35	39	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	35	40	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	35	41	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	35	42	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	35	43	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	35	44	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	36	36	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	36	37	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	36	38	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	36	39	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	36	40	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	36	41	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	36	42	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	36	43	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	36	44	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	37	37	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	37	38	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	37	39	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	37	40	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	37	41	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	37	42	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	37	43	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	37	44	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	38	38	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	38	39	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	38	40	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	38	41	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	38	42	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	38	43	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	38	44	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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