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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
BK2/150/107/31/35
BK2/150/107/32/32
BK2/150/107/32/33
BK2/150/107/32/34
BK2/150/107/32/35
BK2/150/107/32/36
BK2/150/107/32/37
BK2/150/107/32/38
BK2/150/107/32/39
BK2/150/107/32/40
BK2/150/107/32/41
BK2/150/107/32/42
BK2/150/107/33/33
BK2/150/107/33/34
BK2/150/107/33/35
BK2/150/107/33/36
BK2/150/107/33/37
BK2/150/107/33/38
BK2/150/107/33/39
BK2/150/107/33/40
BK2/150/107/33/41
BK2/150/107/33/42
BK2/150/107/34/34
BK2/150/107/34/35
BK2/150/107/34/36
BK2/150/107/34/37
BK2/150/107/34/38
BK2/150/107/34/39
BK2/150/107/34/40
BK2/150/107/34/41
BK2/150/107/34/42
BK2/150/107/35/35
BK2/150/107/35/36
BK2/150/107/35/37
BK2/150/107/35/38
BK2/150/107/35/39
BK2/150/107/35/40
BK2/150/107/35/41
BK2/150/107/35/42
BK2/150/107/36/36
BK2/150/107/36/37
BK2/150/107/36/38
BK2/150/107/36/39
BK2/150/107/36/40
BK2/150/107/36/41
BK2/150/107/36/42
BK2/150/107/37/37
BK2/150/107/37/38
BK2/150/107/37/39
BK2/150/107/37/40
BK2/150/107/37/41
BK2/150/107/37/42
BK2/150/107/38/38
BK2/150/107/38/39
BK2/150/107/38/40
BK2/150/107/38/41
BK2/150/107/38/42
BK2/150/107/39/39
BK2/150/107/39/40
BK2/150/107/39/41
BK2/150/107/39/42
BK2/150/107/40/40
BK2/150/107/40/41
BK2/150/107/40/42
BK2/150/107/41/41
BK2/150/107/41/42
BK2/150/107/42/42
BK2/150/107/MPB/MPB

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	31	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	32	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	32	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	32	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	32	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	32	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	32	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	32	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	32	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	32	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	32	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	32	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	33	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	33	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	33	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	33	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	33	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	33	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	33	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	33	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	33	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	33	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	34	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	34	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	34	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	34	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	34	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	34	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	34	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	34	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	34	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	35	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	36	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	36	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	36	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	36	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	36	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	36	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	36	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	37	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	37	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	37	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	37	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	37	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	37	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	38	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	38	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	38	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	38	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	38	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	39	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	39	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	39	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	39	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	40	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	40	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	40	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	41	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	41	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	42	42	81	107	150	1.5	0.21~0.40	0.25	2	36	110	70	150
1 Piece(s)	5 Days	100~less than 500	0-Pilot Bore	0-Pilot Bore	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