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Flexible Couplings - Bellows Type, Zero Backlash, BKL 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

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

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Part Number
BKL/500/25.4/53.97
BKL/500/25.4/57.15
BKL/500/25.4/60.32
BKL/500/28.58/28.58
BKL/500/28.58/31.75
BKL/500/28.58/34.93
BKL/500/28.58/38.1
BKL/500/28.58/41.27
BKL/500/28.58/44.45
BKL/500/28.58/47.62
BKL/500/28.58/50.8
BKL/500/28.58/53.97
BKL/500/28.58/57.15
BKL/500/28.58/60.32
BKL/500/38.1/38.1
BKL/500/38.1/41.27
BKL/500/38.1/44.45
BKL/500/38.1/47.62
BKL/500/38.1/50.8
BKL/500/38.1/53.97
BKL/500/38.1/57.15
BKL/500/38.1/60.32
BKL/500/41.27/41.27
BKL/500/41.27/44.45
BKL/500/41.27/47.62
BKL/500/41.27/50.8
BKL/500/41.27/53.97
BKL/500/41.27/57.15
BKL/500/44.45/44.45
BKL/500/44.45/47.62
BKL/500/44.45/50.8
BKL/500/44.45/53.97
BKL/500/44.45/57.15
BKL/500/44.45/60.32
BKL/500/47.62/47.62
BKL/500/47.62/50.8
BKL/500/47.62/53.97
BKL/500/47.62/57.15
BKL/500/50.8/50.8
BKL/500/50.8/53.97
BKL/500/50.8/57.15
BKL/500/50.8/60.32
BKL/500/53.97/53.97
BKL/500/53.97/57.15
BKL/500/53.97/60.32
BKL/500/57.15/57.15
BKL/500/57.15/60.32
BKL/500/60.32/60.32

Minimum order quantity	Days to Ship	Allowable Torque Range (N•m)	Outer Dia. A (Ø)	Overall Length W (mm)	Allowable Torque (N•m)	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	100~less than 500	123	114	500	0.0083	1	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1	2 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	1 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	1 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	1 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	1 1/2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	1 5/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	1 3/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	1 7/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/8	2 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	1 1/2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	1 5/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	1 3/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	1 7/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 1/2	2 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 5/8	1 5/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 5/8	1 3/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 5/8	1 7/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 5/8	2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 5/8	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 5/8	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 3/4	1 3/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 3/4	1 7/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 3/4	2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 3/4	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 3/4	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 3/4	2 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 7/8	1 7/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 7/8	2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 7/8	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	1 7/8	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2	2	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2	2 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2 1/8	2 1/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2 1/8	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2 1/8	2 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2 1/4	2 1/4	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2 1/4	2 3/8	42.5	290000	200	500
1 Piece(s)	21 Days	100~less than 500	123	114	500	0.0083	2 3/8	2 3/8	42.5	290000	200	500

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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	Allowable Angular Misalignment(deg)	1
Allowable Lateral Misalignment Range(mm)	0.02~0.2	Allowable Lateral Misalignment(mm)	0.2	Operating Temperature Range(℃)	-30::100

Configure

318 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

Allowable Torque Range(N•m)
1.01~3.00

3.01~5.00

5.01~10.00

10.01~20.00

20.01~50.00

50.01~100.00

100~less than 500
Clear
Outer Dia. A(Ø)
25

32

40

56

66

82

110

123
Clear
Overall Length W(mm)
30

40

44

58

68

79

92

109

114
Clear
Allowable Torque(N•m)
2

4.5

10

15

30

60

80

150

300

500
Clear
For Shaft Size D1(inch)
1

1 1/2

1 1/4

1 1/8

1/2

1 3/4

1 3/8

1/4

1 5/8

1 7/8

1/8

2

2 1/4

2 1/8

2 3/8

3/4

3/8

5/8

5/16

7/8

7/16
Clear
For Shaft Size D2(inch)
1

1 1/2

1 1/4

1 1/8

1/2

1 3/4

1 3/8

1/4

1 5/8

1 7/8

1/8

2

2 1/4

2 1/8

2 3/8

3/4

3/8

5/8

5/16

7/8

7/16
Clear
Fit Length (mm)(mm)
10.5

13

21.5

26

28

32.5

41

42.5
Clear
Torsional Stiffness (N-m/rad)(N-m/rad)
1500

7000

9000

23000

31000

72000

80000

141000

157000

290000
Clear
Tightening Torque of the Fastening Screw (N-m)(N-m)
2.3

4

4.5

8

15

40

70

85

120

200
Clear
Size
2

4.5

10

15

30

60

80

150

300

500
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, BKL 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)

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

CAD