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Flexible Couplings - Bellows type, zero backlash, BK2 series, (Inches). (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.
Pilot bore parts can be found on the metric page.here.

Part Number

Configured Part Number is shown.

Product Specifications
Part Numbers

: 30; 60; 90

Part Number
BK2/30/69/12.7/28.58
BK2/30/69/15.88/28.58
BK2/30/69/19.05/28.58
BK2/30/69/22.23/28.58
BK2/30/69/25.4/28.58
BK2/30/69/28.58/28.58
BK2/30/77/12.7/28.58
BK2/30/77/15.88/28.58
BK2/30/77/19.05/28.58
BK2/30/77/22.23/28.58
BK2/30/77/25.4/28.58
BK2/30/77/28.58/28.58
BK2/30/113/12.7/28.58
BK2/30/113/15.88/28.58
BK2/30/113/19.05/28.58
BK2/30/113/22.23/28.58
BK2/30/113/25.4/28.58
BK2/30/113/28.58/28.58
BK2/60/83/12.7/28.58
BK2/60/83/15.88/28.58
BK2/60/83/19.05/28.58
BK2/60/83/22.23/28.58
BK2/60/83/25.4/28.58
BK2/60/83/28.58/28.58
BK2/60/93/12.7/28.58
BK2/60/93/15.88/28.58
BK2/60/93/19.05/28.58
BK2/60/93/22.23/28.58
BK2/60/93/25.4/28.58
BK2/60/93/28.58/28.58
BK2/60/130/12.7/28.58
BK2/60/130/15.88/28.58
BK2/60/130/19.05/28.58
BK2/60/130/22.23/28.58
BK2/60/130/25.4/28.58
BK2/60/130/28.58/28.58
BK2/80/94/15.88/28.58
BK2/80/94/19.05/28.58
BK2/80/94/22.23/28.58
BK2/80/94/25.4/28.58
BK2/80/94/28.58/28.58
BK2/80/106/15.88/28.58
BK2/80/106/19.05/28.58
BK2/80/106/22.23/28.58
BK2/80/106/25.4/28.58
BK2/80/106/28.58/28.58
BK2/80/143/15.88/28.58
BK2/80/143/19.05/28.58
BK2/80/143/22.23/28.58
BK2/80/143/25.4/28.58
BK2/80/143/28.58/28.58
BK2/150/95/19.05/28.58
BK2/150/95/22.23/28.58
BK2/150/95/25.4/28.58
BK2/150/95/28.58/28.58
BK2/150/107/19.05/28.58
BK2/150/107/22.23/28.58
BK2/150/107/25.4/28.58
BK2/150/107/28.58/28.58
BK2/150/144/19.05/28.58
BK2/150/144/22.23/28.58
BK2/150/144/25.4/28.58
BK2/150/144/28.58/28.58

Minimum order quantity	Days to Ship	Allowable Torque Range (N•m)	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)	For Shaft Size D1 (inch)	For Shaft Size D2 (inch)	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	20.01~50.00	55	69	30	1	0.02~0.2	0.2	0.00012	1/2	1 1/8	27	39000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	69	30	1	0.02~0.2	0.2	0.00012	5/8	1 1/8	27	39000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	69	30	1	0.02~0.2	0.2	0.00012	3/4	1 1/8	27	39000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	69	30	1	0.02~0.2	0.2	0.00012	7/8	1 1/8	27	39000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	69	30	1	0.02~0.2	0.2	0.00012	1	1 1/8	27	39000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	69	30	1	0.02~0.2	0.2	0.00012	1 1/8	1 1/8	27	39000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	77	30	1.5	0.21~0.40	0.25	0.00013	1/2	1 1/8	27	28000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	77	30	1.5	0.21~0.40	0.25	0.00013	5/8	1 1/8	27	28000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	77	30	1.5	0.21~0.40	0.25	0.00013	3/4	1 1/8	27	28000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	77	30	1.5	0.21~0.40	0.25	0.00013	7/8	1 1/8	27	28000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	77	30	1.5	0.21~0.40	0.25	0.00013	1	1 1/8	27	28000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	77	30	1.5	0.21~0.40	0.25	0.00013	1 1/8	1 1/8	27	28000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	113	30	2	0.41~1.0	1	0.00014	1/2	1 1/8	27	27000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	113	30	2	0.41~1.0	1	0.00014	5/8	1 1/8	27	27000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	113	30	2	0.41~1.0	1	0.00014	3/4	1 1/8	27	27000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	113	30	2	0.41~1.0	1	0.00014	7/8	1 1/8	27	27000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	113	30	2	0.41~1.0	1	0.00014	1	1 1/8	27	27000	15	30
1 Piece(s)	21 Days	20.01~50.00	55	113	30	2	0.41~1.0	1	0.00014	1 1/8	1 1/8	27	27000	15	30
1 Piece(s)	21 Days	50.01~100.00	66	83	60	1	0.02~0.2	0.2	0.00032	1/2	1 1/8	31	76000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	83	60	1	0.02~0.2	0.2	0.00032	5/8	1 1/8	31	76000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	83	60	1	0.02~0.2	0.2	0.00032	3/4	1 1/8	31	76000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	83	60	1	0.02~0.2	0.2	0.00032	7/8	1 1/8	31	76000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	83	60	1	0.02~0.2	0.2	0.00032	1	1 1/8	31	76000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	83	60	1	0.02~0.2	0.2	0.00032	1 1/8	1 1/8	31	76000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	93	60	1.5	0.21~0.40	0.25	0.00035	1/2	1 1/8	31	55000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	93	60	1.5	0.21~0.40	0.25	0.00035	5/8	1 1/8	31	55000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	93	60	1.5	0.21~0.40	0.25	0.00035	3/4	1 1/8	31	55000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	93	60	1.5	0.21~0.40	0.25	0.00035	7/8	1 1/8	31	55000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	93	60	1.5	0.21~0.40	0.25	0.00035	1	1 1/8	31	55000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	93	60	1.5	0.21~0.40	0.25	0.00035	1 1/8	1 1/8	31	55000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	130	60	2	0.41~1.0	1	0.0004	1/2	1 1/8	31	54000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	130	60	2	0.41~1.0	1	0.0004	5/8	1 1/8	31	54000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	130	60	2	0.41~1.0	1	0.0004	3/4	1 1/8	31	54000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	130	60	2	0.41~1.0	1	0.0004	7/8	1 1/8	31	54000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	130	60	2	0.41~1.0	1	0.0004	1	1 1/8	31	54000	40	60
1 Piece(s)	21 Days	50.01~100.00	66	130	60	2	0.41~1.0	1	0.0004	1 1/8	1 1/8	31	54000	40	60
1 Piece(s)	21 Days	50.01~100.00	81	94	80	1	0.02~0.2	0.2	0.0008	5/8	1 1/8	36	129000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	94	80	1	0.02~0.2	0.2	0.0008	3/4	1 1/8	36	129000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	94	80	1	0.02~0.2	0.2	0.0008	7/8	1 1/8	36	129000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	94	80	1	0.02~0.2	0.2	0.0008	1	1 1/8	36	129000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	94	80	1	0.02~0.2	0.2	0.0008	1 1/8	1 1/8	36	129000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	106	80	1.5	0.21~0.40	0.25	0.00085	5/8	1 1/8	36	85000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	106	80	1.5	0.21~0.40	0.25	0.00085	3/4	1 1/8	36	85000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	106	80	1.5	0.21~0.40	0.25	0.00085	7/8	1 1/8	36	85000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	106	80	1.5	0.21~0.40	0.25	0.00085	1	1 1/8	36	85000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	106	80	1.5	0.21~0.40	0.25	0.00085	1 1/8	1 1/8	36	85000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	143	80	2	0.41~1.0	1	0.0009	5/8	1 1/8	36	84000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	143	80	2	0.41~1.0	1	0.0009	3/4	1 1/8	36	84000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	143	80	2	0.41~1.0	1	0.0009	7/8	1 1/8	36	84000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	143	80	2	0.41~1.0	1	0.0009	1	1 1/8	36	84000	50	80
1 Piece(s)	21 Days	50.01~100.00	81	143	80	2	0.41~1.0	1	0.0009	1 1/8	1 1/8	36	84000	50	80
1 Piece(s)	21 Days	100~less than 500	81	95	150	1	0.02~0.2	0.2	0.00019	3/4	1 1/8	36	175000	70	150
1 Piece(s)	21 Days	100~less than 500	81	95	150	1	0.02~0.2	0.2	0.00019	7/8	1 1/8	36	175000	70	150
1 Piece(s)	21 Days	100~less than 500	81	95	150	1	0.02~0.2	0.2	0.00019	1	1 1/8	36	175000	70	150
1 Piece(s)	21 Days	100~less than 500	81	95	150	1	0.02~0.2	0.2	0.00019	1 1/8	1 1/8	36	175000	70	150
1 Piece(s)	21 Days	100~less than 500	81	107	150	1.5	0.21~0.40	0.25	0.0002	3/4	1 1/8	36	110000	70	150
1 Piece(s)	21 Days	100~less than 500	81	107	150	1.5	0.21~0.40	0.25	0.0002	7/8	1 1/8	36	110000	70	150
1 Piece(s)	21 Days	100~less than 500	81	107	150	1.5	0.21~0.40	0.25	0.0002	1	1 1/8	36	110000	70	150
1 Piece(s)	21 Days	100~less than 500	81	107	150	1.5	0.21~0.40	0.25	0.0002	1 1/8	1 1/8	36	110000	70	150
1 Piece(s)	21 Days	100~less than 500	81	144	150	2	0.41~1.0	1	0.00021	3/4	1 1/8	36	97000	70	150
1 Piece(s)	21 Days	100~less than 500	81	144	150	2	0.41~1.0	1	0.00021	7/8	1 1/8	36	97000	70	150
1 Piece(s)	21 Days	100~less than 500	81	144	150	2	0.41~1.0	1	0.00021	1	1 1/8	36	97000	70	150
1 Piece(s)	21 Days	100~less than 500	81	144	150	2	0.41~1.0	1	0.00021	1 1/8	1 1/8	36	97000	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

63 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
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
For Shaft Size D1(inch)
1

1 1/2

1 1/8

1/2

1 3/8

1 5/8

3/4

3/8

5/8

7/8
Clear
Fit Length (mm)(mm)
22

27

31

36
Clear
Torsional Stiffness (N-m/rad)(N-m/rad)
14000

15000

20000

27000

28000

39000

54000

55000

76000

84000

85000

97000

110000

129000

175000
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(inch)
1

1 1/2

1 1/4

1 1/8

1/2

1 3/8

1 5/8

3/4

3/8

5/8

7/8
Clear
CAD
- 3D
Clear

Days to Ship

All

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, (Inches). (Part Numbers)

Basic Information

Configure

Specification/Dimensions

Allowable Torque Range(N•m)

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)

For Shaft Size D1(inch)

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(inch)

CAD