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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

Part Number
BK2/15/59/MPB/MPB
BK2/15/66/MPB/MPB
BK2/15/99/MPB/MPB
BK2/30/69/MPB/MPB
BK2/30/77/MPB/MPB
BK2/30/113/MPB/MPB
BK2/60/83/MPB/MPB
BK2/60/93/MPB/MPB
BK2/60/130/MPB/MPB
BK2/80/94/MPB/MPB
BK2/80/106/MPB/MPB
BK2/80/143/MPB/MPB
BK2/150/95/MPB/MPB
BK2/150/107/MPB/MPB
BK2/150/144/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)	5 Days	10.01~20.00	0-Pilot Bore	0-Pilot Bore	49	59	15	1	0.02~0.2	0.15	0.06	27	20	8	15
1 Piece(s)	5 Days	10.01~20.00	0-Pilot Bore	0-Pilot Bore	49	66	15	1.5	0.02~0.2	0.2	0.07	22	15	8	15
1 Piece(s)	5 Days	10.01~20.00	0-Pilot Bore	0-Pilot Bore	49	99	15	1.5	0.02~0.2	0.2	0.08	22	14	8	15
1 Piece(s)	5 Days	20.01~50.00	0-Pilot Bore	0-Pilot Bore	66	69	30	1	0.02~0.2	0.2	0.12	27	39	15	30
1 Piece(s)	5 Days	20.01~50.00	0-Pilot Bore	0-Pilot Bore	55	77	30	1.5	0.21~0.40	0.25	0.13	27	28	15	30
1 Piece(s)	5 Days	20.01~50.00	0-Pilot Bore	0-Pilot Bore	55	113	30	2	0.41~1.0	1	0.14	27	27	15	30
1 Piece(s)	5 Days	50.01~100.00	0-Pilot Bore	0-Pilot Bore	66	83	60	1	0.02~0.2	0.2	0.32	31	76	40	60
1 Piece(s)	5 Days	50.01~100.00	0-Pilot Bore	0-Pilot Bore	66	93	60	1.5	0.21~0.40	0.25	0.35	31	55	40	60
1 Piece(s)	5 Days	50.01~100.00	0-Pilot Bore	0-Pilot Bore	66	130	60	2	0.41~1.0	1	0.4	31	54	40	60
1 Piece(s)	5 Days	50.01~100.00	0-Pilot Bore	0-Pilot Bore	81	94	80	1	0.02~0.2	0.2	0.8	36	129	50	80
1 Piece(s)	5 Days	50.01~100.00	0-Pilot Bore	0-Pilot Bore	81	106	80	1.5	0.21~0.40	0.25	0.85	36	85	50	80
1 Piece(s)	5 Days	50.01~100.00	0-Pilot Bore	0-Pilot Bore	81	143	80	2	0.41~1.0	1	0.9	36	84	50	80
1 Piece(s)	5 Days	100~less than 500	0-Pilot Bore	0-Pilot Bore	81	95	150	1	0.02~0.2	0.2	1.9	36	175	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
1 Piece(s)	5 Days	100~less than 500	0-Pilot Bore	0-Pilot Bore	81	144	150	2	0.41~1.0	1	2.1	36	97	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

15 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
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
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
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

Allowable Torque Range(N•m)

For Shaft Size D1(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

For Shaft Size D2(mm)

CAD