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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/300/41/56
BKL/300/41/57
BKL/300/41/58
BKL/300/41/59
BKL/300/41/60
BKL/300/42/42
BKL/300/42/43
BKL/300/42/44
BKL/300/42/45
BKL/300/42/46
BKL/300/42/47
BKL/300/42/48
BKL/300/42/49
BKL/300/42/50
BKL/300/42/51
BKL/300/42/52
BKL/300/42/53
BKL/300/42/54
BKL/300/42/55
BKL/300/42/56
BKL/300/42/57
BKL/300/42/58
BKL/300/42/59
BKL/300/42/60
BKL/300/43/43
BKL/300/43/44
BKL/300/43/45
BKL/300/43/46
BKL/300/43/47
BKL/300/43/48
BKL/300/43/49
BKL/300/43/50
BKL/300/43/51
BKL/300/43/52
BKL/300/43/53
BKL/300/43/54
BKL/300/43/55
BKL/300/43/56
BKL/300/43/57
BKL/300/43/58
BKL/300/43/59
BKL/300/43/60
BKL/300/44/44
BKL/300/44/45
BKL/300/44/46
BKL/300/44/47
BKL/300/44/48
BKL/300/44/49
BKL/300/44/50
BKL/300/44/51
BKL/300/44/52
BKL/300/44/53
BKL/300/44/54
BKL/300/44/55
BKL/300/44/56
BKL/300/44/57
BKL/300/44/58
BKL/300/44/59
BKL/300/44/60
BKL/300/45/45
BKL/300/45/46
BKL/300/45/47
BKL/300/45/48
BKL/300/45/49
BKL/300/45/50
BKL/300/45/51
BKL/300/45/52
BKL/300/45/53
BKL/300/45/54
BKL/300/45/55
BKL/300/45/56
BKL/300/45/57
BKL/300/45/58
BKL/300/45/59
BKL/300/45/60
BKL/300/46/46
BKL/300/46/47
BKL/300/46/48
BKL/300/46/49
BKL/300/46/50
BKL/300/46/51
BKL/300/46/52
BKL/300/46/53
BKL/300/46/54
BKL/300/46/55
BKL/300/46/56
BKL/300/46/57
BKL/300/46/58
BKL/300/46/59
BKL/300/46/60

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	41	56	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	41	57	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	41	58	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	41	59	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	41	60	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	42	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	43	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	44	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	45	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	46	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	47	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	48	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	49	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	50	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	51	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	52	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	53	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	54	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	55	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	56	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	57	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	58	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	59	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	42	60	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	43	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	44	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	45	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	46	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	47	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	48	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	49	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	50	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	51	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	52	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	53	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	54	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	55	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	56	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	57	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	58	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	59	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	43	60	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	44	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	45	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	46	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	47	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	48	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	49	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	50	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	51	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	52	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	53	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	54	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	55	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	56	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	57	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	58	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	59	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	44	60	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	45	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	46	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	47	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	48	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	49	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	50	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	51	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	52	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	53	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	54	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	55	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	56	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	57	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	58	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	59	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	45	60	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	46	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	47	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	48	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	49	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	50	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	51	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	52	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	53	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	54	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	55	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	56	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	57	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	58	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	59	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	46	60	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300

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