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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
BK2/150/107/25/32
BK2/150/107/25/33
BK2/150/107/25/34
BK2/150/107/25/35
BK2/150/107/25/36
BK2/150/107/25/37
BK2/150/107/25/38
BK2/150/107/25/39
BK2/150/107/25/40
BK2/150/107/25/41
BK2/150/107/25/42
BK2/150/107/26/26
BK2/150/107/26/27
BK2/150/107/26/28
BK2/150/107/26/29
BK2/150/107/26/30
BK2/150/107/26/31
BK2/150/107/26/32
BK2/150/107/26/33
BK2/150/107/26/34
BK2/150/107/26/35
BK2/150/107/26/36
BK2/150/107/26/37
BK2/150/107/26/38
BK2/150/107/26/39
BK2/150/107/26/40
BK2/150/107/26/41
BK2/150/107/26/42
BK2/150/107/27/27
BK2/150/107/27/28
BK2/150/107/27/29
BK2/150/107/27/30
BK2/150/107/27/31
BK2/150/107/27/32
BK2/150/107/27/33
BK2/150/107/27/34
BK2/150/107/27/35
BK2/150/107/27/36
BK2/150/107/27/37
BK2/150/107/27/38
BK2/150/107/27/39
BK2/150/107/27/40
BK2/150/107/27/41
BK2/150/107/27/42
BK2/150/107/28/28
BK2/150/107/28/29
BK2/150/107/28/30
BK2/150/107/28/31
BK2/150/107/28/32
BK2/150/107/28/33
BK2/150/107/28/34
BK2/150/107/28/35
BK2/150/107/28/36
BK2/150/107/28/37
BK2/150/107/28/38
BK2/150/107/28/39
BK2/150/107/28/40
BK2/150/107/28/41
BK2/150/107/28/42
BK2/150/107/29/29
BK2/150/107/29/30
BK2/150/107/29/31
BK2/150/107/29/32
BK2/150/107/29/33
BK2/150/107/29/34
BK2/150/107/29/35
BK2/150/107/29/36
BK2/150/107/29/37
BK2/150/107/29/38
BK2/150/107/29/39
BK2/150/107/29/40
BK2/150/107/29/41
BK2/150/107/29/42
BK2/150/107/30/30
BK2/150/107/30/31
BK2/150/107/30/32
BK2/150/107/30/33
BK2/150/107/30/34
BK2/150/107/30/35
BK2/150/107/30/36
BK2/150/107/30/37
BK2/150/107/30/38
BK2/150/107/30/39
BK2/150/107/30/40
BK2/150/107/30/41
BK2/150/107/30/42
BK2/150/107/31/31
BK2/150/107/31/32
BK2/150/107/31/33
BK2/150/107/31/34

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	25	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	25	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	25	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	25	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	25	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	25	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	25	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	25	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	25	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	25	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	25	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	26	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	27	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	28	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	29	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	30	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	30	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	30	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	30	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	30	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	30	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	30	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	30	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	30	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	30	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	30	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	30	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	30	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	31	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	31	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	31	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	31	34	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