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

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	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
1 Piece(s)	21 Days	100~less than 500	38	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	38	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	38	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	38	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	38	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	38	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	40	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	40	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	40	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	42	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	43	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	43	44	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

1,306 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

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

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