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Flexible Couplings - Bellows type, zero backlash, BK2 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

Sizes 200 and above are available on special request.

Part Number

Configured Part Number is shown.

Product Specifications
Part Numbers

: 30; 60; 90

Part Number
BK2/150/107/20/42
BK2/150/107/21/21
BK2/150/107/21/22
BK2/150/107/21/23
BK2/150/107/21/24
BK2/150/107/21/25
BK2/150/107/21/26
BK2/150/107/21/27
BK2/150/107/21/28
BK2/150/107/21/29
BK2/150/107/21/30
BK2/150/107/21/31
BK2/150/107/21/32
BK2/150/107/21/33
BK2/150/107/21/34
BK2/150/107/21/35
BK2/150/107/21/36
BK2/150/107/21/37
BK2/150/107/21/38
BK2/150/107/21/39
BK2/150/107/21/40
BK2/150/107/21/41
BK2/150/107/21/42
BK2/150/107/22/22
BK2/150/107/22/23
BK2/150/107/22/24
BK2/150/107/22/25
BK2/150/107/22/26
BK2/150/107/22/27
BK2/150/107/22/28
BK2/150/107/22/29
BK2/150/107/22/30
BK2/150/107/22/31
BK2/150/107/22/32
BK2/150/107/22/33
BK2/150/107/22/34
BK2/150/107/22/35
BK2/150/107/22/36
BK2/150/107/22/37
BK2/150/107/22/38
BK2/150/107/22/39
BK2/150/107/22/40
BK2/150/107/22/41
BK2/150/107/22/42
BK2/150/107/23/23
BK2/150/107/23/24
BK2/150/107/23/25
BK2/150/107/23/26
BK2/150/107/23/27
BK2/150/107/23/28
BK2/150/107/23/29
BK2/150/107/23/30
BK2/150/107/23/31
BK2/150/107/23/32
BK2/150/107/23/33
BK2/150/107/23/34
BK2/150/107/23/35
BK2/150/107/23/36
BK2/150/107/23/37
BK2/150/107/23/38
BK2/150/107/23/39
BK2/150/107/23/40
BK2/150/107/23/41
BK2/150/107/23/42
BK2/150/107/24/24
BK2/150/107/24/25
BK2/150/107/24/26
BK2/150/107/24/27
BK2/150/107/24/28
BK2/150/107/24/29
BK2/150/107/24/30
BK2/150/107/24/31
BK2/150/107/24/32
BK2/150/107/24/33
BK2/150/107/24/34
BK2/150/107/24/35
BK2/150/107/24/36
BK2/150/107/24/37
BK2/150/107/24/38
BK2/150/107/24/39
BK2/150/107/24/40
BK2/150/107/24/41
BK2/150/107/24/42
BK2/150/107/25/25
BK2/150/107/25/26
BK2/150/107/25/27
BK2/150/107/25/28
BK2/150/107/25/29
BK2/150/107/25/30
BK2/150/107/25/31

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	20	42	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	21	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	22	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	23	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	24	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	25	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	26	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	27	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	28	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	29	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	30	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	31	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	32	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	33	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	34	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	35	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	36	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	37	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	38	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	39	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	40	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	41	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	21	42	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	22	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	23	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	24	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	25	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	26	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	27	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	28	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	29	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	30	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	31	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	32	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	33	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	34	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	35	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	36	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	37	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	38	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	39	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	40	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	41	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	22	42	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	23	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	24	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	25	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	26	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	27	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	28	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	29	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	30	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	31	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	32	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	33	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	34	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	35	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	36	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	37	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	38	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	39	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	40	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	41	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	23	42	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	24	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	25	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	26	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	27	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	28	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	29	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	30	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	31	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	32	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	33	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	34	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	35	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	36	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	37	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	38	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	39	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	40	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	41	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	24	42	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	25	25	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	25	26	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	25	27	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	25	28	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	25	29	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	25	30	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	21 Days	100~less than 500	25	31	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150

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

1,238 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

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(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 Lateral Misalignment Range(mm)
0.02~0.2

0.21~0.40

0.41~1.0
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. (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)

Allowable Torque(N•m)

Allowable Angular Misalignment(deg)

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 Lateral Misalignment Range(mm)

CAD