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Flexible Couplings - zero backlash, EK2 series, (Inches).

R+W

Features
Easy to mount
Highly concentric assembly
Vibration damping

Design
Two concentrically machined hubs with curved jaws and clamping screws, with calibrated preloaded insert

Material
Hubs: high strength aluminum
Elastomer: wear resistant thermanally stable TPU, available in 3 hardness levels

Advantage
Smooth running and reliable transmission with absorption of vibration and shock

Size 800 is available on special request.

Part Number

Configured Part Number is shown.

Product Specifications
Part Numbers

: 30; 45; 60

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Part Number
EK2/20/A/9.53/9.53
EK2/20/A/9.53/11.11
EK2/20/A/9.53/12.7
EK2/20/A/9.53/15.88
EK2/20/A/9.53/19.05
EK2/20/A/9.53/22.23
EK2/20/A/11.11/11.11
EK2/20/A/11.11/12.7
EK2/20/A/11.11/15.88
EK2/20/A/11.11/19.05
EK2/20/A/11.11/22.23
EK2/20/A/12.7/12.7
EK2/20/A/12.7/15.88
EK2/20/A/12.7/19.05
EK2/20/A/12.7/22.23
EK2/20/A/15.88/15.88
EK2/20/A/15.88/19.05
EK2/20/A/15.88/22.23
EK2/20/A/19.05/19.05
EK2/20/A/19.05/22.23
EK2/20/A/22.23/22.23
EK2/20/B/9.53/9.53
EK2/20/B/9.53/11.11
EK2/20/B/9.53/12.7
EK2/20/B/9.53/15.88
EK2/20/B/9.53/19.05
EK2/20/B/9.53/22.23
EK2/20/B/11.11/11.11
EK2/20/B/11.11/12.7
EK2/20/B/11.11/15.88
EK2/20/B/11.11/19.05
EK2/20/B/11.11/22.23
EK2/20/B/12.7/12.7
EK2/20/B/12.7/15.88
EK2/20/B/12.7/19.05
EK2/20/B/12.7/22.23
EK2/20/B/15.88/15.88
EK2/20/B/15.88/19.05
EK2/20/B/15.88/22.23
EK2/20/B/19.05/19.05
EK2/20/B/19.05/22.23
EK2/20/B/22.23/22.23
EK2/20/C/9.53/9.53
EK2/20/C/9.53/11.11
EK2/20/C/9.53/12.7
EK2/20/C/9.53/15.88
EK2/20/C/9.53/19.05
EK2/20/C/9.53/22.23
EK2/20/C/11.11/11.11
EK2/20/C/11.11/12.7
EK2/20/C/11.11/15.88
EK2/20/C/11.11/19.05
EK2/20/C/11.11/22.23
EK2/20/C/12.7/12.7
EK2/20/C/12.7/15.88
EK2/20/C/12.7/19.05
EK2/20/C/12.7/22.23
EK2/20/C/15.88/15.88
EK2/20/C/15.88/19.05
EK2/20/C/15.88/22.23

Minimum order quantity	Days to Ship	Allowable Torque Range (N•m)	Outer Dia. A (Ø)	Overall Length W (mm)	Max. Rotational Speed Range (r/min)	Allowable Torque (N•m)	Max. Rotational Speed (r/min)	Allowable Angular Misalignment (deg)	Allowable Lateral Misalignment Range (mm)	Allowable Lateral Misalignment (mm)	Operating Temperature Range (℃)	Moment of Inertia (kg･m²)	For Shaft Size D1 (inch)	For Shaft Size D2 (inch)	Fit Length (mm) (mm)	Tightening Torque of the Fastening Screw (in-lbs) (in-lbs)	Size	Elastomer Insert
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/8	3/8	25	71	20	A - Shore 98A
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/8	3/7	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/8	1/2	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/8	5/8	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/8	3/4	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/8	7/8	25	71	20	A - Shore 98A
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/7	3/7	25	71	20	A - Shore 98A
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/7	1/2	25	71	20	A - Shore 98A
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/7	5/8	25	71	20	A - Shore 98A
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/7	3/4	25	71	20	A - Shore 98A
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/7	7/8	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	1/2	1/2	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	1/2	5/8	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	1/2	3/4	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	1/2	7/8	25	71	20	A - Shore 98A
1 Piece(s)	5 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	5/8	5/8	25	71	20	A - Shore 98A
1 Piece(s)	5 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	5/8	3/4	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	5/8	7/8	25	71	20	A - Shore 98A
1 Piece(s)	5 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/4	3/4	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	3/4	7/8	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	34	12500	1	0.02~0.2	0.1	-30～100	0.00003	7/8	7/8	25	71	20	A - Shore 98A
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/8	3/8	25	71	20	B - Shore 64D
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/8	3/7	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/8	1/2	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/8	5/8	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/8	3/4	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/8	7/8	25	71	20	B - Shore 64D
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/7	3/7	25	71	20	B - Shore 64D
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/7	1/2	25	71	20	B - Shore 64D
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/7	5/8	25	71	20	B - Shore 64D
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/7	3/4	25	71	20	B - Shore 64D
1 Piece(s)	21 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/7	7/8	25	71	20	B - Shore 64D
1 Piece(s)	5 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	1/2	1/2	25	71	20	B - Shore 64D
1 Piece(s)	5 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	1/2	5/8	25	71	20	B - Shore 64D
1 Piece(s)	5 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	1/2	3/4	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	1/2	7/8	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	5/8	5/8	25	71	20	B - Shore 64D
1 Piece(s)	5 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	5/8	3/4	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	5/8	7/8	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/4	3/4	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	3/4	7/8	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	20.01~50.00	42	66	10001~78000	42	12500	0.8	0.02~0.2	0.08	-30～120	0.00003	7/8	7/8	25	71	20	B - Shore 64D
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/8	3/8	25	71	20	C - Shore 80A
1 Piece(s)	21 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/8	3/7	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/8	1/2	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/8	5/8	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/8	3/4	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/8	7/8	25	71	20	C - Shore 80A
1 Piece(s)	21 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/7	3/7	25	71	20	C - Shore 80A
1 Piece(s)	21 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/7	1/2	25	71	20	C - Shore 80A
1 Piece(s)	21 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/7	5/8	25	71	20	C - Shore 80A
1 Piece(s)	21 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/7	3/4	25	71	20	C - Shore 80A
1 Piece(s)	21 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	3/7	7/8	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	1/2	1/2	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	1/2	5/8	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	1/2	3/4	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	1/2	7/8	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	5/8	5/8	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	5/8	3/4	25	71	20	C - Shore 80A
1 Piece(s)	8 Days	10.01~20.00	42	66	10001~78000	12	12500	1.2	0.21~0.40	0.25	-30～100	0.00003	5/8	7/8	25	71	20	C - Shore 80A

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Basic Information

Type	Jaw Type	Application	Servo Motor / Stepping Motor	Feature	No Backlash
Body Material	Aluminum	Buffer Part Material	Polyurethane	Allowable Axial Misalignment (±)(mm)	2

Configure

489 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

500~less than 1000

1000~less than 5000
Clear
Outer Dia. A(Ø)
42

56

67

82

102
Clear
Overall Length W(mm)
66

78

90

114

126
Clear
Max. Rotational Speed Range(r/min)
4001~10000

10001~78000
Clear
Allowable Torque(N•m)
12

34

40

42

85

120

150

170

190

320

400

650

810

1060

1350
Clear
Max. Rotational Speed(r/min)
8000

9000

10000

11000

12500
Clear
Allowable Angular Misalignment(deg)
0.8

1

1.2
Clear
Allowable Lateral Misalignment Range(mm)
0.02~0.2

0.21~0.40
Clear
Allowable Lateral Misalignment(mm)
0.08

0.1

0.12

0.14

0.15

0.18

0.2

0.25

0.3

0.35
Clear
For Shaft Size D1(inch)
1

1 1/2

1 1/4

1 1/8

1/2

1 2/3

1 3/4

1 3/7

1 3/8

1 5/8

1 7/8

2

2 1/4

2 1/8

3/4

3/7

3/8

5/8

7/8
Clear
For Shaft Size D2(inch)
1

1 1/2

1 1/4

1 1/8

1/2

1 2/3

1 3/4

1 3/7

1 3/8

1 5/8

1 7/8

2

2 1/4

2 1/8

3/4

3/7

3/8

5/8

7/8
Clear
Fit Length (mm)(mm)
25

30

35

45

50
Clear
Tightening Torque of the Fastening Screw (in-lbs)(in-lbs)
- 71
- 133
- 310
- 620
- 1062
Clear
Size
20

60

150

300

450
Clear
Elastomer Insert
- B - Shore 64D
- C - Shore 80A
- A - Shore 98A
Clear
CAD
- 3D
Clear

Days to Ship

All

5 Days or Less

8 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 - zero backlash, EK2 series, (Inches).

Basic Information

Configure

Specification/Dimensions

Allowable Torque Range(N•m)

Outer Dia. A(Ø)

Overall Length W(mm)

Max. Rotational Speed Range(r/min)

Allowable Torque(N•m)

Max. Rotational Speed(r/min)

Allowable Angular Misalignment(deg)

Allowable Lateral Misalignment Range(mm)

Allowable Lateral Misalignment(mm)

For Shaft Size D1(inch)

For Shaft Size D2(inch)

Fit Length (mm)(mm)

Tightening Torque of the Fastening Screw (in-lbs)(in-lbs)

Size

Elastomer Insert

CAD