| Part Number | Max. Bore Diameter (mm) |
Rated Torque*1 (N・m) Torque*1 (lbf in.) Max. Rotational Frequency |
(min-1) Moment of | Inertia (kg・m2)*2 Inertia (oz. in.2)*2 Static | Torsional Stiffness (N・m/rad) Torsional Stiffness (lbf in./deg) Max. Lateral Misalignment | (mm) (in.) Max. Angular |
Misalignment (°) Max. Axial | Misalignment (mm) Misalignment (in.) Mass | (g) *2 (oz) *2 |
|---|---|---|---|---|---|---|---|---|---|
| MDW-40C-10-10 | 20 | 3.5 |
15000 | 1.9×10-5 |
1400 |
0.15 |
1.5 | ±0.5 |
100 |
*1: Correction of rated torque due to load fluctuation is not required. For more detailed information, please refer to Selection Guidelines.
*2: These are values with max. bore diameter.
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| Part Number | |
|---|---|
| Amount | |
| Price($) |
Additional Modification Service
Modified Part Number
Enter the desired bore diameter and then click [Check Modified Part Number].
| Standard bore diameter(D1) | Standard bore diameter(D2) | Modified Part Number | Price | Add to cart |
|---|---|---|---|---|
|
mm
in.
|
mm
in.
|
Cart |
- D1:Input the available disk type bore diameter.
- D2:Select from the pull-down menu.
- D1:Select from the pull-down menu.
- D2:Input the available disk type bore diameter.

| Applicable Bore Diameter D1D2 |
keyway | Key | |||||||
|---|---|---|---|---|---|---|---|---|---|
| b | t | Nominal Dimension b×h |
|||||||
| Standard Dimension | Allowance (JS9) |
Standard Dimension | Allowance | ||||||
| 6 | 7 | 2 | ±0.0125 | 1.0 | +0.1 0 |
2×2 | |||
| 8 | 9 | 10 | 3 | ±0.0125 | 1.4 | 3×3 | |||
| 11 | 12 | 4 | ±0.0150 | 1.8 | 4×4 | ||||
| 13 | 14 | 15 | 16 | 17 | 5 | ±0.0150 | 2.3 | 5×5 | |
| 18 | 19 | 20 | 22 | 6 | ±0.0150 | 2.8 | 6×6 | ||
| 24 | 25 | 28 | 30 | 8 | ±0.0180 | 3.3 | +0.2 0 |
8×7 | |
| 32 | 35 | 36 | 38 | 10 | ±0.0180 | 3.3 | 10×8 | ||
| 40 | 42 | 44 | 12 | ±0.0215 | 3.3 | 12×8 | |||
| 45 | 48 | 50 | 14 | ±0.0215 | 3.8 | 14×9 | |||
| 55 | 16 | ±0.0215 | 4.3 | 16×10 | |||||

| Standard Inch Bore Diameter D1D2 |
Keyway | |||
|---|---|---|---|---|
| Wk | T | |||
| Standard Dimension | Allowance | Standard Dimension | Allowance | |
| 1/2 | 1/8 | +0.002 0 |
0.560 | +0.01 0 |
| 9/16 | 1/8 | +0.002 0 |
0.623 | +0.01 0 |
| 5/8 | 3/16 | +0.002 0 |
0.709 | +0.01 0 |
| 11/16 | 3/16 | +0.002 0 |
0.773 | +0.01 0 |
| 3/4 | 3/16 | +0.002 0 |
0.837 | +0.01 0 |
| 13/16 | 3/16 | +0.002 0 |
0.900 | +0.01 0 |
| 7/8 | 3/16 | +0.002 0 |
0.964 | +0.01 0 |
| 15/16 | 1/4 | +0.002 0 |
1.051 | +0.01 0 |
| 1 | 1/4 | +0.002 0 |
1.114 | +0.01 0 |
| 1-1/8 | 1/4 | +0.002 0 |
1.241 | +0.01 0 |
| 1-1/4 | 1/4 | +0.002 0 |
1.367 | +0.01 0 |
| 1-3/8 | 5/16 | +0.002 0 |
1.518 | +0.01 0 |
| 1-1/2 | 3/8 | +0.002 0 |
1.669 | +0.01 0 |
| 1-5/8 | 3/8 | +0.002 0 |
1.796 | +0.01 0 |
| 1-3/4 | 3/8 | +0.002 0 |
1.922 | +0.01 0 |
- Refer to the "Couplicon Bore Diameter Additional Modification Service" for more information.
- BT: Additional modification of bore
- KT: Metric Keyway Modification (JIS Standard)
- KA: Inch Keyway Modification (AGMA Standard)
Structure
Clamping Type

Material/Finish
| MDW-C | |
|---|---|
| Hub | A2017 Anodized*1 |
| Spacer | A2017 Anodized |
| Disk | SUS304 |
| Pin | SUS303 |
| Collar | SUS303 |
| Hex Socket Head Cap Screw | SCM435 Ferrosoferric Oxide Film (Black) |
*1: Due to manufacturing process requirements, couplings may have bores with or without surface treatment. This does not affect the performance of the couplings.
Characteristics
- Applicable motors
| MDW-C | |
|---|---|
| Servomotor | ◎ |
| Stepping Motor | ◎ |
| General-purpose Motor | ● |
- Property
| MDW-C | |
|---|---|
| Zero Backlash | ◎ |
| Allowable Misalignment | ○ |
- This is a disk type flexible coupling.
- The stainless steel disk allows eccentricity, and angular misalignment, and end-play.
Application
Actuator / XY stageRelated Products
The Double-Disk type Flexible Coupling XHW-C is compatible with the servomotor with 350% instantaneous max. torque is available.XHW-C






