Series EC – Elastomer Insert Jaw Couplings
DieQua offers the EC Series Elastomer Jaw Couplings for applications that require higher performance than typical insert couplings. These anti-backlash stainless steel jaw couplings provide zero backlash, several clamping styles, and five different insert types that provide varying degrees of torsional rigidity.
-
Torque Range: 2 – 660 Nm (Rated) | Up to 1,350 Nm (Max Peak)
-
Bore Sizes: 4 mm to 60 mm (0.16″ to 2.36″) | Keyway optional
-
Max Speed: Up to 10,000 RPM (Standard; higher with balancing)
-
Backlash: Zero / Anti-backlash (Pre-stressed elastomer inserts)
-
Hub Materials: High-Strength Aluminum (Standard) | Stainless Steel (Optional)
-
Insert Material: TPU (Standard) / Hytrel® (High-temp options)
-
Mounting Styles: Clamping Hub (EC), Compact Clamping (ECC), Split Clamping (ECS), Intermediate Spacer (ECX)
-
Zero-Backlash Design: Pre-stressed thermoplastic inserts eliminate play, ensuring precise positioning and high torsional rigidity for servo and motion control applications.
-
Vibration Damping & Shock Absorption: High damping capacity dampens torsional vibrations and isolates shock loads, protecting sensitive drive components and reducing noise.
-
Multiple Insert Hardness Options: Available in five insert types (varying Shore hardness) to tailor torsional stiffness, damping characteristics, and alignment tolerance to your system requirements.
-
Flexible Clamping & Mounting Configurations:
-
EC (Standard Clamping): Concentric hub with single-screw clamping connection.
-
ECC (Compact Clamping): Space-saving design with low moment of inertia.
-
ECS (Split Clamping): Two-piece split hub for radial mounting without disturbing connected shafts.
-
ECX (Spacer Coupling): Intermediate spacer design to span wider shaft gaps while maintaining electrical isolation.
-
-
Misalignment Compensation: Accommodates axial, lateral (parallel), and angular misalignment to minimize stress on motor and gearbox bearings.
-
Electrical Isolation & ATEX Ready: Electrically isolating properties prevent current transfer; conductive insert options prevent electrostatic charging for ATEX explosive environment compliance.
Download the Catalog
See charts below for specs:
What’s Next?
Elastomer Jaw Coupling Overview: Models EC – ECC – ECS – ECX
Model EC – Elastomer Insert Coupling with Clamping Hub
(5 sizes with rated torque from 6-660 Nm)
Design Description: Two longer concentrically machined hubs with single screw clamping connection. Our most popular model!
Bore Diameters: Metric or inch bores from 8-60 mm, or .314 – 2.36 inches. Keyways are optional, but not necessary.
Hub Materials: Size 20-450 in high-strength aluminum. Stainless steel available for all sizes upon request.
Rated Speed: Up to 10,000 RPM standard. Higher with balancing.
Temperature Range: Download the catalog for Temperature range.
Sizes: EC-20, EC-60, EC-150, EC-300, EC-450
Application Example:
Sizing Chart:
| EC | 20 | 60 | 150 | 300 | 450 | |
|---|---|---|---|---|---|---|
| Type (Elastomer Insert) | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | |
| Rated torque (Nm) | T KN | 17 | 21 | 6 | 60 | 75 | 20 | 160 | 200 | 42 | 325 | 405 | 84 | 530 | 660 | 95 |
| Max. Torque (Nm) | T Kmax | 34 | 42 | 12 | 120 | 150 | 35 | 320 | 400 | 85 | 650 | 810 | 170 | 1060 | 1350 | 190 |
| Overall Length (mm) | A | 66 | 78 | 90 | 114 | 126 |
| Outside Diameter (mm) | B | 42 | 56 | 66.5 | 82 | 102 |
| Outside Diameter with screw head (mm) | Bs | 44.5 | 57 | 68 | 85 | 105 |
| Mounting length (mm) | C | 25 | 30 | 35 | 45 | 50 |
| Inside diameter range H7 (mm) | D1/2 | 8-25 | 12-32 | 19-36 | 20-45 | 28-60 |
| Inside diameter of elastomer | DE | 19.2 | 26.2 | 29.2 | 36.2 | 46.2 |
| Clamping screw ISO 4762 | E | M5 | M6 | M8 | M10 | M12 |
| Tightening Torque of clamping screw (Nm) | E | 8 | 15 | 35 | 70 | 120 |
| Distance between centerlines (mm) | F | 15.5 | 21 | 24 | 29 | 38 |
| Distance (mm) | G | 8.5 | 10 | 12 | 15 | 17.5 |
| Hub length (mm) | H | 39 | 46 | 52.5 | 66 | 73 |
| Download - 2D .dxf - COMING SOON | ||||||
| Download - 3D .STP | STP | STP | STP | STP | STP | |
| For Full Tech Details Download Catalog | ||||||
MODEL ECC – Elastomer Coupling with Compact Clamping Hub
(7 sizes with rated torque from 2 – 660 Nm)
Design Description: Two concentrically machined hubs with single screw clamping connection. Our most compact design!
Bore Diameters: Metric or inch bores from 4-60 mm, or 0.16-2.36 inches. Keyways are optional, but not necessary.
Hub Materials: Size 5-450 in high-strength aluminum. Stainless steel available for all sizes upon request.
Rated Speed: Up to 4,000 RPM standard. Higher with balancing.
Temperature Range: Download the catalog for Temperature range.
Sizes: ECC-5, ECC-10, ECC-20, ECC-60, ECC-150, ECC-300, ECC-450
Application Example:
Sizing Chart:
| ECC | 5 | 10 | 20 | 60 | 150 | 300 | 450 | |
|---|---|---|---|---|---|---|---|---|
| Type (Elastomer Insert) | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | |
| Rated torque (Nm) | T KN | 9 | 12 | 2 | 12.5 | 16 | 4 | 17 | 21 | 6 | 60 | 75 | 20 | 160 | 200 | 42 | 325 | 405 | 84 | 530 | 660 | 95 |
| Max. Torque (Nm) | T Kmax | 18 | 24 | 4 | 25 | 32 | 6 | 34 | 42 | 12 | 120 | 150 | 35 | 320 | 400 | 85 | 650 | 810 | 170 | 1060 | 1350 | 190 |
| Overall Length (mm) | A | 26 | 32 | 50 | 58 | 62 | 86 | 94 |
| Outside Diameter (mm) | B | 25 | 32 | 42 | 56 | 66.5 | 82 | 102 |
| Outside Diameter with screw head (mm) | Bs | 25 | 32 | 44.5 | 57 | 68 | 85 | 105 |
| Mounting length (mm) | C | 8 | 10.3 | 17 | 20 | 21 | 31 | 34 |
| Inside diameter range H7 (mm) | D1/2 | 4-12.7 | 4-16 | 8-25 | 12-32 | 19-36 | 20-45 | 28-60 |
| Inside diameter of elastomer | DE | 10.2 | 14.2 | 19.2 | 26.2 | 29.2 | 36.2 | 46.2 |
| Clamping screw ISO 4762 | E | M3 | M4 | M5 | M6 | M8 | M10 | M12 |
| Tightening Torque of clamping screw (Nm) | E | 2 | 4 | 8 | 15 | 35 | 70 | 120 |
| Distance between centerlines (mm) | F | 8 | 10.5 | 15.5 | 21 | 24 | 29 | 38 |
| Distance (mm) | G | 4 | 5 | 8.5 | 10 | 11 | 15 | 17.5 |
| Hub length (mm) | H | 16.7 | 20.7 | 31 | 36 | 39 | 52 | 57 |
| Download - 2D .dxf - COMING SOON | ||||||||
| Download - 3D .STP | STP | STP | STP | STP | STP | STP | STP | |
| For Full Tech Details Download Catalog | ||||||||
Model ECS – Elastomer Insert Coupling with Split Clamping Hub
(6 sizes with rated torque from 4 – 660 Nm)
Design Description: Has removable, concentrically machined, hub halves for easy mounting.
Bore Diameters: Metric or inch bores from 6-60 mm, or .23 – 2.36 inches. Keyways are optional, but not necessary.
Hub Materials: High-strength aluminum. Stainless steel available for all sizes upon request.
Rated Speed: Up to 4,000 RPM standard. Higher with balancing.
Temperature Range: Download the catalog for Temperature range.
Sizes: ECS-10, ECS-20, ECS-60, ECS-150, ECS-300, ECS-450
Application Example:
Sizing Chart:
| ECS | 10 | 20 | 60 | 150 | 300 | 450 | |
|---|---|---|---|---|---|---|---|
| Type (Elastomer Insert) | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | |
| Rated torque (Nm) | T KN | 12.6 | 16 | 4 | 17 | 21 | 6 | 60 | 75 | 20 | 160 | 200 | 42 | 325 | 405 | 84 | 530 | 660 | 95 |
| Max. Torque (Nm) | T Kmax | 25 | 32 | 6 | 34 | 42 | 12 | 120 | 150 | 35 | 320 | 400 | 85 | 650 | 810 | 170 | 1060 | 1350 | 190 |
| Overall Length (mm) | A | 53 | 66 | 78 | 90 | 114 | 126 |
| Length of Center Section (mm) | AE | 20 | 28.8 | 34 | 38 | 50 | 52 |
| Outside Diameter with screw head (mm) | Bs | 32 | 42 | 56 | 66.5 | 82 | 102 |
| Mounting length (mm) | C | 20 | 25 | 30 | 35 | 45 | 50 |
| Inside diameter range H7 (mm) | D1/2 | 6-16 | 8-25 | 12-32 | 19-36 | 20-45 | 28-60 |
| Inside diameter of elastomer | DE | 14.2 | 19.2 | 26.2 | 29.2 | 36.2 | 46.2 |
| Clamping screw ISO 4762 | E | 4xM4 | 4xM5 | 4xM6 | 4xM8 | 4xM10 | 4xM12 |
| Tightening Torque of clamping screw (Nm) | E | 4 | 8 | 15 | 35 | 70 | 120 |
| Distance between centers (mm) | F | 10.5 | 15.5 | 21 | 24 | 29 | 38 |
| Distance (mm) | G/G1 | 7.5 | 8.5 | 10 | 12 | 15 | 17.5 |
| Hub length (mm) | H/H1 | 31 | 39 | 46 | 52.5 | 66 | 73 |
| Download - 2D .dxf - COMING SOON | |||||||
| Download - 3D .STP | STP | STP | STP | STP | STP | STP | |
| For Full Tech Details Download Catalog | |||||||
Model ECX – Elastomer Intermediate Spacer
(7 sizes with rated torque from 2-660 Nm)
Design Description: A concentrically machined spacer with curved jaws. 2x elastomer segments press fit for zero backlash; standard versions are electrically isolating.
Sizes: ECX-5, ECX-10, ECX-20, ECX-60, ECX-150, ECX-300, ECX-450
Sizing Chart:
| ECX | 5 | 10 | 20 | 60 | 150 | 300 | 450 | |
|---|---|---|---|---|---|---|---|---|
| Type (Elastomer Insert) | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | A | B | C | |
| Rated torque (Nm) | T KN | 9 | 12 | 2 | 12.5 | 16 | 4 | 17 | 21 | 6 | 60 | 75 | 20 | 160 | 200 | 42 | 325 | 405 | 84 | 530 | 660 | 95 |
| Max. Torque (Nm) | T Kmax | 18 | 24 | 4 | 25 | 32 | 6 | 34 | 42 | 12 | 120 | 150 | 35 | 320 | 400 | 85 | 650 | 810 | 170 | 1060 | 1350 | 190 |
| Overall Length (mm) | A | 26 | 30 | 39 | 48 | 53 | 62 | 86 |
| Outside Diameter (mm) | B | 25 | 32 | 42 | 56 | 66.5 | 82 | 102 |
| Hub length (mm) | C | 9 | 9 | 10 | 16 | 18 | 20 | 40 |
| Inside diameter (mm) | D | 15 | 18 | 25 | 32 | 38 | 45 | 60 |
| Inside diameter of elastomer (mm) | DE | 10.2 | 14.2 | 19.2 | 26.2 | 29.2 | 36.2 | 46.2 |
| Moment of Inertia (10-3 kgm2) | J1/J2 | 0.0005 | 0.002 | 0.008 | 0.03 | 0.05 | 0.1 | 0.6 |
| Download - 2D .dxf - COMING SOON | ||||||||
| Download - 3D .stp - COMING SOON | ||||||||
| For Full Tech Details Download Catalog | ||||||||
Coupling Insert Options, Temperature Ranges, and Stiffness Ratings:
The elastomer inserts are made of thermoplastic polyurethane (TPU), in a variety of shore values. To provide different stiffness and vibration damping characteristics, optional Hytrel® material can be offered for higher temperature applications.
The inserts are pre-stressed during assembly which provides zero backlash, more consistent load sharing, and improved restoring forces for precise positioning and repeatability.
For information on shaft misalignment, torsional stiffness and other details about the elastomer inserts, please download the catalog.
* Due to the electrically conductive properties of the insert, electrostatically charging of the coupling is prevented. This eliminates sparks during normal operation in explosive areas. Technical data is available upon request.
The values of the relative damping were determined at 10 Hz and 20˚C.
Compensates for Misalignment
The elastomer insert jaw coupling can compensate for axial, lateral (parallel), and angular misalignment. This aids in assembly and reduces load stress on drive bearings. It is important to consider the maximum values highlighted in the catalog to avoid premature wear of the elastomer element. In order to see these values please download the catalog.
Ordering Examples & Part Number Definitions
Other Models Available
Why Choose an Elastomer Jaw Coupling?
These couplings are ideal for maintaining position control while absorbing shocks and vibration. They are an economical solution where the extra cost of bellows or disc designs are not warranted.
