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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/500/50/55
BKL/500/50/56
BKL/500/50/57
BKL/500/50/58
BKL/500/50/59
BKL/500/50/60
BKL/500/51/51
BKL/500/51/52
BKL/500/51/53
BKL/500/51/54
BKL/500/51/55
BKL/500/51/56
BKL/500/51/57
BKL/500/51/58
BKL/500/51/59
BKL/500/51/60
BKL/500/52/52
BKL/500/52/53
BKL/500/52/54
BKL/500/52/55
BKL/500/52/56
BKL/500/52/57
BKL/500/52/58
BKL/500/52/59
BKL/500/52/60
BKL/500/53/53
BKL/500/53/54
BKL/500/53/55
BKL/500/53/56
BKL/500/53/57
BKL/500/53/58
BKL/500/53/59
BKL/500/53/60
BKL/500/54/54
BKL/500/54/55
BKL/500/54/56
BKL/500/54/57
BKL/500/54/58
BKL/500/54/59
BKL/500/54/60
BKL/500/55/55
BKL/500/55/56
BKL/500/55/57
BKL/500/55/58
BKL/500/55/59
BKL/500/55/60
BKL/500/56/56
BKL/500/56/57
BKL/500/56/58
BKL/500/56/59
BKL/500/56/60
BKL/500/57/57
BKL/500/57/58
BKL/500/57/59
BKL/500/57/60
BKL/500/58/58
BKL/500/58/59
BKL/500/58/60
BKL/500/59/59
BKL/500/59/60
BKL/500/60/60
BKL/500/61/35
BKL/500/61/36
BKL/500/61/37
BKL/500/61/38
BKL/500/61/39
BKL/500/61/40
BKL/500/61/41
BKL/500/61/42
BKL/500/61/43
BKL/500/61/44
BKL/500/61/45
BKL/500/61/46
BKL/500/61/47
BKL/500/61/48
BKL/500/61/49
BKL/500/61/50
BKL/500/61/51
BKL/500/61/52
BKL/500/61/53
BKL/500/61/54
BKL/500/61/55
BKL/500/61/56
BKL/500/61/57
BKL/500/61/58
BKL/500/61/59
BKL/500/61/60
BKL/500/61/61
BKL/500/61/62
BKL/500/62/35

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	50	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	50	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	50	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	50	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	50	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	50	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	51	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	51	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	51	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	51	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	51	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	51	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	51	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	51	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	51	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	51	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	52	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	52	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	52	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	52	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	52	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	52	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	52	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	52	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	52	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	53	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	53	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	53	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	53	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	53	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	53	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	53	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	53	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	54	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	54	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	54	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	54	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	54	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	54	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	54	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	55	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	55	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	55	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	55	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	55	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	55	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	56	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	56	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	56	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	56	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	56	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	57	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	57	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	57	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	57	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	58	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	58	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	58	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	59	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	59	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	60	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	61	35	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	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	61	61	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	61	62	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	62	35	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