Flexible Shaft Coupling Accessories - EK Series Elastomer Inserts

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The equalizing element of the EK coupling is the elastomer insert. It transmits torque without backlash or vibration. The elastomer insert defines the characteristics of the entire drive system.

Backlash is eliminated by the press fit of the elastomer into the hubs. Through variation of the Shore hardness of the elastomer insert, the coupling system can be optimized for the ideal torsional characteristics.

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Product specification
Part Numbers

R+W Elastomer Couplings

Information

Axes of Misalignment


Lateral	Angular	Axial

Function

The equalizing element of the EK coupling is the elastomer insert.
It transmits torque without backlash or vibration.The elastomer
insert defines the characteristics of the entire drive system.

Backlash is eliminated by the press fit of the elastomer into the hubs.
Through variation of the Shore hardness of the elastomer insert,
the coupling system can be optimized for the ideal torsional characteristics.

Sizes 2 - 800

Shore hardness 98 A Shore hardness 64 Sh D Shore hardness 80 Sh A Shore hardness 65 Sh D Shore hardness 64 Sh D

Sizes 2500 - 9500

The coupling includes 5x elastomer segments

Shore hardness 98 Sh A Shore hardness 64 Sh D Shore hardness 65 Sh D Shore hardness 64 Sh D

Specification

Description of the Elastomer Inserts

Type	Shore hardness	Color	Material	Relative damping (Ψ)		Temperature range		Features
A	98 Sh A	red	TPU		0.4 - 0.5		-30°C to +100°C	high damping
B	64 Sh D	green	TPU		0.3 - 0.45		-30°C to +120°C	high torsional stiffness
C	80 Sh A	yellow	TPU		0.3 - 0.4		-30°C to +100°C	very high damping
D*	65 Sh D	black	TPU		0.3 - 0.45		-10°C to +70°C	electrically conductive
E	64 Sh D	beige	Hytrel		0.3 - 0.45		-50°C to +150°C	temperature resistant

*The electrical conductivity of the elastomer material is to prevent the electrostatic charging of the elastomer coupling system, to reduce the risk of sparking in operation. ATEX technical data is available upon request.
The values of the relative damping were determined at 10 Hz and +20˚ C.

Sizes EK

SIZE			2			5			10			20			60			150
Type (Elastomer insert)			A	B	C	A	B	C	A	B	C	A	B	C	A	B	C	A	B	C
Static torsional stiffness	(Nm/rad)	C_T	50	115	17	150	350	53	260	600	90	1140	2500	520	3290	9750	1400	4970	10600	2000
Dynamic torsional stiffness	(Nm/rad)	C_Tdyn	100	230	35	300	700	106	541	1650	224	2540	4440	876	7940	11900	2072	13400	29300	3590
Lateral	(mm)	Max. values	0.08	0.06	0.2	0.08	0.06	0.2	0.1	0.08	0.22	0.1	0.08	0.25	0.12	0.1	0.25	0.15	0.12	0.3
Angular	(Degree)		1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1	0.8	1.2
Axial	(mm)		±1			±1			±1			±1.5			±1.5			±1.8

SIZE*			300			450			800			2500		4500		9500
Type (Elastomer insert)			A	B	C	A	B	C	A	B	C	A	B	A	B	A	B
Static torsional stiffness	(Nm/rad)	C_T	12400	18000	3000	15100	27000	4120	41300	66080	10320	87600	109000	167000	372000	590000	670000
Dynamic torsional stiffness	(Nm/rad)	C_Tdyn	23700	40400	6090	55400	81200	11600	82600	180150	28600	175000	216000	337000	743000	1180000	1340000
Lateral	(mm)	Max. values	0.18	0.14	0.35	0.2	0.18	0.35	0.25	0.2	0.4	0.5	0.3	0.5	0.3	0.6	0.4
Angular	(Degree)		1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1.5	1	1.5	1	1.5	1
Axial	(mm)		±2			±2			±2			±3		±3		±4

Static torsional stiffness at 50% T_KN Dynamic torsional stiffness at T_KN
* Note: The technical values for elastomer inserts D and E correspond to the values for B, due to the identical Shore hardness.

Data to be displayed: 30; 45; 60

Part Number
EK/0002/A
EK/0002/B
EK/0002/C
EK/0002/D
EK/0002/E
EK/0005/A
EK/0005/B
EK/0005/C
EK/0005/D
EK/0005/E
EK/0010/A
EK/0010/B
EK/0010/C
EK/0010/D
EK/0010/E
EK/0020/A
EK/0020/B
EK/0020/C
EK/0020/D
EK/0020/E
EK/0060/A
EK/0060/B
EK/0060/C
EK/0060/D
EK/0060/E
EK/0150/A
EK/0150/B
EK/0150/C
EK/0150/D
EK/0150/E
EK/0300/A
EK/0300/B
EK/0300/C
EK/0300/D
EK/0300/E
EK/0450/A
EK/0450/B
EK/0450/C
EK/0450/D
EK/0450/E
EK/0800/A
EK/0800/B
EK/0800/C
EK/0800/D
EK/0800/E
EK/2500/A
EK/2500/B
EK/2500/D
EK/2500/E
EK/4500/A
EK/4500/B
EK/4500/D
EK/4500/E
EK/9500/A
EK/9500/B
EK/9500/D
EK/9500/E

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	Allowable Torque Range (N•m)	Max. Rotational Speed Range (r/min)	Feature	Allowable Torque (Nm)	Max. Rotational Speed (r/min)	Allowable Lateral Misalignment Range (mm)	Allowable Lateral Misalignment (mm)	Allowable Angular Misalignment (deg)	Operating Temperature Range (°C)	Allowable Axial Clearance (±) (mm)	Torsional Stiffness (N-m/rad)	Size	Elastomer Insert
3.01 €	1	12 Days	3.01 to 5.00	10,001 to 78,000	Vibration Insulation	4	60000	0.02 to 0.2	0.08	1	-30～100	1	50	2	A - Shore 98A
3.20 €	1	12 Days	3.01 to 5.00	10,001 to 78,000	High Torsional Rigidity	5	67000	0.02 to 0.2	0.06	0.8	-30～120	1	115	2	B - Shore 64D
3.20 €	1	12 Days	0.05 to 1.00	10,001 to 78,000	Vibration Insulation	1	45000	0.02 to 0.2	0.2	1.2	-30～100	1	17	2	C - Shore 80A
6.01 €	1	12 Days	1.01 to 3.00	10,001 to 78,000	-	2.4	15000	0.02 to 0.2	0.06	0.8	-10～70	1	115	2	D - Shore 65D
13.17 €	1	12 Days	3.01 to 5.00	10,001 to 78,000	Heat Resistant	5	67000	0.02 to 0.2	0.06	0.8	-50～150	1	115	2	E - Shore 64D
3.69 €	1	12 Days	3.01 to 5.00	10,001 to 78,000	Vibration Insulation	4	57000	0.02 to 0.2	0.08	1	-30～100	1	150	5	A - Shore 98A
3.87 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	High Torsional Rigidity	24	65000	0.02 to 0.2	0.06	0.8	-30～120	1	350	5	B - Shore 64D
3.87 €	1	12 Days	0.05 to 1.00	10,001 to 78,000	Vibration Insulation	1	43000	0.02 to 0.2	0.2	1.2	-30～100	1	53	5	C - Shore 80A
6.59 €	1	12 Days	10.01 to 20.00	10,001 to 78,000	-	12	15000	0.02 to 0.2	0.06	0.8	-10～70	1	350	5	D - Shore 65D
14.44 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	Heat Resistant	24	65000	0.02 to 0.2	0.06	0.8	-50～150	1	350	5	E - Shore 64D
8.63 €	1	12 Days	0.05 to 1.00	10,001 to 78,000	Vibration Insulation	25	53000	0.02 to 0.2	0.1	1	-30～100	1	260	10	A - Shore 98A
11.64 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	High Torsional Rigidity	32	63000	0.02 to 0.2	0.08	0.8	-30～120	1	600	10	B - Shore 64D
11.64 €	1	12 Days	5.01 to 10.00	10,001 to 78,000	Vibration Insulation	6	40000	0.21 to 0.40	0.22	1.2	-30～100	1	90	10	C - Shore 80A
17.25 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	-	22	44100	0.02 to 0.2	0.06	0.56	-10～70	1	600	10	D - Shore 65D
23.46 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	Heat Resistant	32	63000	0.02 to 0.2	0.08	0.8	-50～150	1	600	10	E - Shore 64D
9.30 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	Vibration Insulation	34	45000	0.02 to 0.2	0.1	1	-30～100	2	1140	20	A - Shore 98A
12.31 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	High Torsional Rigidity	42	60000	0.02 to 0.2	0.08	0.8	-30～120	2	2500	20	B - Shore 64D
12.31 €	1	12 Days	10.01 to 20.00	10,001 to 78,000	Vibration Insulation	12	40000	0.21 to 0.40	0.25	1.2	-30～100	2	520	20	C - Shore 80A
22.10 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	-	29	42000	0.02 to 0.2	0.06	0.56	-10～70	2	2500	20	D - Shore 65D
29.65 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	Heat Resistant	42	60000	0.02 to 0.2	0.08	0.8	-50～150	2	2500	20	E - Shore 64D
9.88 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	Vibration Insulation	120	31000	0.02 to 0.2	0.12	1	-30～100	2	3290	60	A - Shore 98A
12.70 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	High Torsional Rigidity	150	31000	0.02 to 0.2	0.1	0.08	-30～120	2	9750	60	B - Shore 64D
12.70 €	1	12 Days	20.01 to 50.00	10,001 to 78,000	Vibration Insulation	35	25000	0.21 to 0.40	0.25	1.2	-30～100	2	1400	60	C - Shore 80A
23.07 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	-	105	21700	0.02 to 0.2	0.07	0.056	-10～70	2	9750	60	D - Shore 65D
37.61 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	Heat Resistant	150	31000	0.02 to 0.2	0.1	0.08	-50～150	2	9750	60	E - Shore 64D
11.06 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	Vibration Insulation	320	22000	0.02 to 0.2	0.15	1	-30～100	2	4970	150	A - Shore 98A
13.86 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	High Torsional Rigidity	400	26000	0.02 to 0.2	0.12	0.8	-30～120	2	10600	150	B - Shore 64D
13.86 €	1	12 Days	50.01 to 100.00	10,001 to 78,000	Vibration Insulation	85	18000	0.21 to 0.40	0.3	1.2	-30～100	2	2000	150	C - Shore 80A
25.20 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	-	280	18200	0.02 to 0.2	0.08	0.056	-10～70	2	10600	150	D - Shore 65D
40.71 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	Heat Resistant	400	26000	0.02 to 0.2	0.12	0.8	-50～150	2	10600	150	E - Shore 64D
12.50 €	1	12 Days	500 to Less Than 1,000	10,001 to 78,000	Vibration Insulation	650	22000	0.02 to 0.2	0.18	1	-30～100	2	12400	300	A - Shore 98A
18.32 €	1	12 Days	500 to Less Than 1,000	10,001 to 78,000	High Torsional Rigidity	810	26000	0.02 to 0.2	0.14	0.8	-30～120	2	18000	300	B - Shore 64D
18.32 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	Vibration Insulation	170	16000	0.21 to 0.40	0.35	1.2	-30～100	2	3000	300	C - Shore 80A
28.89 €	1	12 Days	500 to Less Than 1,000	10,001 to 78,000	-	567	18200	0.02 to 0.2	0.1	0.056	-10～70	2	18000	300	D - Shore 65D
51.17 €	1	12 Days	500 to Less Than 1,000	10,001 to 78,000	Heat Resistant	810	26000	0.02 to 0.2	0.14	0.8	-50～150	2	18000	300	E - Shore 64D
21.52 €	1	12 Days	1000 to Less Than 5000	10,001 to 78,000	Vibration Insulation	1060	16000	0.02 to 0.2	0.2	1	-30～100	2	15100	450	A - Shore 98A
30.72 €	1	12 Days	1000 to Less Than 5000	10,001 to 78,000	High Torsional Rigidity	1350	17000	0.02 to 0.2	0.18	0.8	-30～120	2	27000	450	B - Shore 64D
30.72 €	1	12 Days	100 to Less Than 500	10,001 to 78,000	Vibration Insulation	190	12000	0.21 to 0.40	0.35	1.2	-30～100	2	4120	450	C - Shore 80A
37.40 €	1	12 Days	500 to Less Than 1,000	10,001 to 78,000	-	945	11900	0.02 to 0.2	0.13	0.056	-10～70	2	27000	450	D - Shore 65D
69.21 €	1	12 Days	1000 to Less Than 5000	10,001 to 78,000	Heat Resistant	1350	17000	0.02 to 0.2	0.18	0.8	-50～150	2	27000	450	E - Shore 64D
39.74 €	1	12 Days	500 to Less Than 1,000	2001 to 4,000	Vibration Insulation	950	4000	0.21 to 0.40	0.25	1	-30～100	2	41300	800	A - Shore 98A
46.23 €	1	12 Days	1000 to Less Than 5000	2001 to 4,000	High Torsional Rigidity	1100	4000	0.02 to 0.2	0.2	0.8	-30～120	2	66080	800	B - Shore 64D
46.23 €	1	12 Days	100 to Less Than 500	2001 to 4,000	Vibration Insulation	240	4000	0.21 to 0.40	0.4	1.2	-30～100	2	10320	800	C - Shore 80A
56.99 €	1	12 Days	1000 to Less Than 5000	2001 to 4,000	-	1100	4000	0.02 to 0.2	0.2	0.8	-10～70	2	66080	800	D - Shore 65D
81.40 €	1	12 Days	1000 to Less Than 5000	2001 to 4,000	Heat Resistant	1100	4000	0.02 to 0.2	0.2	0.8	-50～150	2	66080	800	E - Shore 64D
16.09 €	5	12 Days	1000 to Less Than 5000	2001 to 4,000	Vibration Insulation	1950	3500	0.41 to 1.0	0.5	1.5	-30～100	3	87600	2500	A - Shore 98A
16.09 €	5	12 Days	1000 to Less Than 5000	2001 to 4,000	High Torsional Rigidity	2450	3500	0.21 to 0.40	0.3	1	-30～120	3	109000	2500	B - Shore 64D
25.97 €	5	12 Days	1000 to Less Than 5000	2001 to 4,000	-	2450	3500	0.21 to 0.40	0.3	1	-10～70	3	109000	2500	D - Shore 65D
92.65 €	5	12 Days	1000 to Less Than 5000	2001 to 4,000	Heat Resistant	2450	3500	0.21 to 0.40	0.3	1	-50～150	3	109000	2500	E - Shore 64D
24.53 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	Vibration Insulation	5000	3000	0.41 to 1.0	0.5	1.5	-30～100	3	167000	4500	A - Shore 98A
24.53 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	High Torsional Rigidity	6200	3000	0.21 to 0.40	0.3	1	-30～120	3	372000	4500	B - Shore 64D
45.35 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	-	6200	3000	0.21 to 0.40	0.3	1	-10～70	3	372000	4500	D - Shore 65D
125.02 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	Heat Resistant	6200	3000	0.21 to 0.40	0.3	1	-50～150	3	372000	4500	E - Shore 64D
35.17 €	5	12 Days	10,000 to Less than 20,000	1,001 to 2,000	Vibration Insulation	10000	2000	0.41 to 1.0	0.6	1.5	-30～100	4	590000	9500	A - Shore 98A
35.17 €	5	12 Days	10,000 to Less than 20,000	1,001 to 2,000	High Torsional Rigidity	12500	2000	0.21 to 0.40	0.4	1	-30～120	4	670000	9500	B - Shore 64D
57.18 €	5	12 Days	10,000 to Less than 20,000	1,001 to 2,000	-	12500	2000	0.21 to 0.40	0.4	1	-10～70	4	670000	9500	D - Shore 65D
138.00 €	5	12 Days	10,000 to Less than 20,000	1,001 to 2,000	Heat Resistant	12500	2000	0.21 to 0.40	0.4	1	-50～150	4	670000	9500	E - Shore 64D

Basic information

Type	Jaw Type	Allowable Misalignment	Angular Misalignment / Eccentricity / Axial Misalignment	Body Material	Resin
Shaft D1 Keyway	Without Keyway	Shaft D2 Keyway	Without Keyway

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Basic Attributes

Allowable Torque Range(N•m)
0.05 to 1.00

1.01 to 3.00

3.01 to 5.00

5.01 to 10.00

10.01 to 20.00

20.01 to 50.00

50.01 to 100.00

100 to Less Than 500

500 to Less Than 1,000

1000 to Less Than 5000

5,000 to Less Than 10,000

10,000 to Less than 20,000
Clear
Max. Rotational Speed Range(r/min)
1,001 to 2,000

2001 to 4,000

10,001 to 78,000
Clear
Feature
High Torsional Rigidity

Vibration Insulation

Heat Resistant
Clear
Allowable Torque(Nm)
1

2.4

4

5

6

12

22

24

25

29

32

34

35

42

85

105

120

150

170

190

240

280

320

400

567

650

810

945

950

1060

1100

1350

1950

2450

5000

6200

10000

12500
Clear
Max. Rotational Speed(r/min)
2000

3000

3500

4000

11900

12000

15000

16000

17000

18000

18200

21700

22000

25000

26000

31000

40000

42000

43000

44100

45000

53000

57000

60000

63000

65000

67000
Clear
Allowable Lateral Misalignment Range(mm)
0.02 to 0.2

0.21 to 0.40

0.41 to 1.0
Clear
Allowable Lateral Misalignment(mm)
0.06

0.07

0.08

0.1

0.12

0.13

0.14

0.15

0.18

0.2

0.22

0.25

0.3

0.35

0.4

0.5

0.6
Clear
Allowable Angular Misalignment(deg)
0.056

0.08

0.56

0.8

1

1.2

1.5
Clear
Torsional Stiffness(N-m/rad)
17

50

53

90

115

150

260

350

520

600

1140

1400

2000

2500

3000

3290

4120

4970

9750

10320

10600

12400

15100

18000

27000

41300

66080

87600

109000

167000

372000

590000

670000
Clear
Size
2

5

10

20

60

150

300

450

800

2500

4500

9500
Clear
Elastomer Insert
- B - Shore 64D
- E - Shore 64D
- D - Shore 65D
- C - Shore 80A
- A - Shore 98A
Clear
Type
- A
- B
- C
- D
- E
Clear