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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/300/36/58
BKL/300/36/59
BKL/300/36/60
BKL/300/37/37
BKL/300/37/38
BKL/300/37/39
BKL/300/37/40
BKL/300/37/41
BKL/300/37/42
BKL/300/37/43
BKL/300/37/44
BKL/300/37/45
BKL/300/37/46
BKL/300/37/47
BKL/300/37/48
BKL/300/37/49
BKL/300/37/50
BKL/300/37/51
BKL/300/37/52
BKL/300/37/53
BKL/300/37/54
BKL/300/37/55
BKL/300/37/56
BKL/300/37/57
BKL/300/37/58
BKL/300/37/59
BKL/300/37/60
BKL/300/38/38
BKL/300/38/39
BKL/300/38/40
BKL/300/38/41
BKL/300/38/42
BKL/300/38/43
BKL/300/38/44
BKL/300/38/45
BKL/300/38/46
BKL/300/38/47
BKL/300/38/48
BKL/300/38/49
BKL/300/38/50
BKL/300/38/51
BKL/300/38/52
BKL/300/38/53
BKL/300/38/54
BKL/300/38/55
BKL/300/38/56
BKL/300/38/57
BKL/300/38/58
BKL/300/38/59
BKL/300/38/60
BKL/300/39/39
BKL/300/39/40
BKL/300/39/41
BKL/300/39/42
BKL/300/39/43
BKL/300/39/44
BKL/300/39/45
BKL/300/39/46
BKL/300/39/47
BKL/300/39/48
BKL/300/39/49
BKL/300/39/50
BKL/300/39/51
BKL/300/39/52
BKL/300/39/53
BKL/300/39/54
BKL/300/39/55
BKL/300/39/56
BKL/300/39/57
BKL/300/39/58
BKL/300/39/59
BKL/300/39/60
BKL/300/40/40
BKL/300/40/41
BKL/300/40/42
BKL/300/41/41
BKL/300/41/42
BKL/300/41/43
BKL/300/41/44
BKL/300/41/45
BKL/300/41/46
BKL/300/41/47
BKL/300/41/48
BKL/300/41/49
BKL/300/41/50
BKL/300/41/51
BKL/300/41/52
BKL/300/41/53
BKL/300/41/54
BKL/300/41/55

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	36	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	36	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	36	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	37	37	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	37	38	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	37	39	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	37	40	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	37	41	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	37	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	38	38	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	38	39	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	38	40	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	38	41	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	38	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	39	39	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	39	40	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	39	41	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	39	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	40	40	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	40	41	110	109	No Backlash / Low Moment of Inertia	300	5.3	41	157	120	300
1 Piece(s)	21 Days	100~less than 500	40	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	41	41	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	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	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	41	55	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