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Flexible Couplings - Bellows type, zero backlash, BK2 series.

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

Sizes 200 and above are available on special request.

Part Number

Configured Part Number is shown.

Product Specifications
Part Numbers

: 30; 45; 60

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Part Number
BK2/150/95/19/19
BK2/150/95/19/20
BK2/150/95/19/21
BK2/150/95/19/22
BK2/150/95/19/23
BK2/150/95/19/24
BK2/150/95/19/25
BK2/150/95/19/26
BK2/150/95/19/27
BK2/150/95/19/28
BK2/150/95/19/29
BK2/150/95/19/30
BK2/150/95/19/31
BK2/150/95/19/32
BK2/150/95/19/33
BK2/150/95/19/34
BK2/150/95/19/35
BK2/150/95/19/36
BK2/150/95/19/37
BK2/150/95/19/38
BK2/150/95/19/39
BK2/150/95/19/40
BK2/150/95/19/41
BK2/150/95/19/42
BK2/150/95/20/20
BK2/150/95/20/21
BK2/150/95/20/22
BK2/150/95/20/23
BK2/150/95/20/24
BK2/150/95/20/25
BK2/150/95/20/26
BK2/150/95/20/27
BK2/150/95/20/28
BK2/150/95/20/29
BK2/150/95/20/30
BK2/150/95/20/31
BK2/150/95/20/32
BK2/150/95/20/33
BK2/150/95/20/34
BK2/150/95/20/35
BK2/150/95/20/36
BK2/150/95/20/37
BK2/150/95/20/38
BK2/150/95/20/39
BK2/150/95/20/40
BK2/150/95/20/41
BK2/150/95/20/42
BK2/150/95/21/21
BK2/150/95/21/22
BK2/150/95/21/23
BK2/150/95/21/24
BK2/150/95/21/25
BK2/150/95/21/26
BK2/150/95/21/27
BK2/150/95/21/28
BK2/150/95/21/29
BK2/150/95/21/30
BK2/150/95/21/31
BK2/150/95/21/32
BK2/150/95/21/33

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)	Allowable Torque (N•m)	Allowable Angular Misalignment (deg)	Allowable Lateral Misalignment Range (mm)	Allowable Lateral Misalignment (mm)	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	19	19	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	20	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	21	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	22	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	23	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	24	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	25	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	26	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	27	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	28	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	29	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	30	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	31	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	32	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	33	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	34	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	35	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	36	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	37	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	38	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	39	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	40	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	41	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	19	42	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	20	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	21	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	22	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	23	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	24	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	25	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	26	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	27	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	28	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	29	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	30	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	31	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	32	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	33	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	34	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	35	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	36	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	37	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	38	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	39	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	40	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	41	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	20	42	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	21	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	22	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	23	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	24	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	25	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	26	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	27	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	28	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	29	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	30	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	31	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	32	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150
1 Piece(s)	21 Days	100~less than 500	21	33	81	95	150	1	0.02~0.2	0.2	1.9	36	175	70	150

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Basic Information

Type	Bellows Type	Max. Rotational Speed Range(r/min)	4001~10000	Feature	No Backlash / Low Moment of Inertia
Body Material	Aluminum	Max. Rotational Speed(r/min)	10000	Bellows Part Material	Stainless Steel
Operating Temperature Range(℃)	-30::100

Configure

882 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

For Shaft Size D1(mm)
0-Pilot Bore

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
Clear
For Shaft Size D2(mm)
0-Pilot Bore

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
Clear
Outer Dia. A(Ø)
49

55

66

81
Clear
Overall Length W(mm)
59

66

69

77

83

93

94

95

99

106

107

113

130

143

144
Clear
Allowable Torque(N•m)
15

30

60

80

150
Clear
Allowable Angular Misalignment(deg)
1

1.5

2
Clear
Allowable Lateral Misalignment Range(mm)
0.02~0.2

0.21~0.40

0.41~1.0
Clear
Allowable Lateral Misalignment(mm)
0.15

0.2

0.25

1
Clear
Fit Length (mm)(mm)
22

27

31

36
Clear
Torsional Stiffness (N-m/rad)(N-m/rad)
14

15

20

27

28

39

54

55

76

84

85

97

110

129

175
Clear
Tightening Torque of the Fastening Screw (N-m)(N-m)
8

15

40

50

70
Clear
Size
15

30

60

80

150
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
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, BK2 series.

Basic Information

Configure

Specification/Dimensions

For Shaft Size D1(mm)

For Shaft Size D2(mm)

Outer Dia. A(Ø)

Overall Length W(mm)

Allowable Torque(N•m)

Allowable Angular Misalignment(deg)

Allowable Lateral Misalignment Range(mm)

Allowable Lateral Misalignment(mm)

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