Dimension Drawing
Specs/CAD
| Part Number | A | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MOM-15C | 15 | 6.6 | 19 | 6.9 | 2.15 | 5.2 | M1.6 | 0.25 | - | 48.18 | CAD | Cart | |
| MOM-17C | 17 | 9 | 25 | 7.3 | 2.65 | 5.5 | M2 | 0.5 | - | 53.62 | CAD | Cart | |
| MOM-20C | 20 | 10 | 28 | 11.1 | 3.25 | 7.25 | M2.5 | 1 | - | 65.89 | CAD | Cart | |
| MOM-26C | 26 | 11.5 | 31.6 | 13.3 | 4 | 9 | M3 | 1.5 | - | 71.91 | CAD | Cart | |
| MOM-30C | 30 | 12 | 34 | 15.5 | 4 | 11 | M3 | 1.5 | - | 78.37 | CAD | Cart | |
| MOM-34C | 34 | 13 | 35 | 17.5 | 4.5 | 12 | M4 | 3.5 | - | 85.42 | CAD | Cart | |
| MOM-38C | 38 | 15 | 40.5 | 21.5 | 4.75 | 14 | M4 | 3.5 | - | 102.09 | CAD | Cart | |
| MOM-45C | 45 | 16.2 | 47.6 | 24.3 | 6.2 | 16 | M5 | 8 | - | 134.38 | CAD | Cart | |
| MOM-55C | 55 | 20.8 | 58.6 | 27.7 | 7.9 | 20 | M6 | 13 | - | 422.11 | CAD | Cart | |
| MOM-70C | 70 | 25 | 68.6 | 38.5 | 8.9 | 26 | M6 | 13 | - | 497.59 | CAD | Cart |
| Part Number | Max. Bore Diameter (mm) |
Keyway Additional Modification Max. Bore Diameter (mm) |
Rated Torque＊1 (N・m) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| MOM-15C | 6 | 6 | 3.3 | 6.6 | 2000 | 6.2×10-7 | 870 | 0.3 | 2 | 19 |
| MOM-17C | 6.35 | 6 | 5.5 | 11 | 2000 | 1.4×10-6 | 1300 | 0.3 | 2 | 34 |
| MOM-20C | 10 | 10 | 7.7 | 15.4 | 2000 | 3.0×10-6 | 1700 | 0.4 | 2 | 47 |
| MOM-26C | 12 | 12 | 11 | 22 | 2000 | 9.6×10-6 | 3200 | 0.5 | 2 | 92 |
| MOM-30C | 14 | 14 | 26 | 52 | 2000 | 1.8×10-5 | 4600 | 0.6 | 2 | 131 |
| MOM-34C | 16 | 16 | 35 | 70 | 2000 | 3.1×10-5 | 6000 | 0.7 | 2 | 173 |
| MOM-38C | 20 | 20 | 55 | 110 | 2000 | 5.5×10-5 | 7400 | 0.8 | 2 | 235 |
| MOM-45C | 22 | 22 | 66 | 132 | 2000 | 1.2×10-4 | 16000 | 1 | 2 | 387 |
| MOM-55C | 25 | 25 | 99 | 198 | 2000 | 3.4×10-4 | 30000 | 1.2 | 2 | 752 |
| MOM-70C | 35 | 35 | 176 | 352 | 2000 | 1.0×10-3 | 46000 | 1.4 | 2 | 1370 |
＊1： Correction of rated torque and max. torque due to load fluctuation is not required.
※ The shaft's slip torque may be smaller than the coupling's rated torque depending on the shaft bore. MOMMOM-CMOM-K
＊2： These are values with max. bore diameter.＊3： The max. lateral misalignment varies depending on the load torque and revolution.
| Part Number | Standard Bore Diameter D1･D2 | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 5 | 6 | 6.35 | 8 | 10 | 12 | 14 | 15 | 16 | 18 | 20 | 22 | 24 | 25 | 28 | 30 | 35 | |
| MOM-15C | ● | ● | ● | ● | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| MOM-17C | - | ● | ● | ● | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| MOM-20C | - | - | ● | ● | ● | ● | ● | - | - | - | - | - | - | - | - | - | - | - | - |
| MOM-26C | - | - | - | ● | ● | ● | ● | ● | - | - | - | - | - | - | - | - | - | - | - |
| MOM-30C | - | - | - | - | - | ● | ● | ● | ● | - | - | - | - | - | - | - | - | - | - |
| MOM-34C | - | - | - | - | - | - | ● | ● | ● | ● | ● | - | - | - | - | - | - | - | - |
| MOM-38C | - | - | - | - | - | - | ● | ● | ● | ● | ● | ● | ● | - | - | - | - | - | - |
| MOM-45C | - | - | - | - | - | - | - | ● | ● | ● | ● | ● | ● | ● | - | - | - | - | - |
| MOM-55C | - | - | - | - | - | - | - | - | - | ● | ● | ● | ● | ● | ● | ● | - | - | - |
| MOM-70C | - | - | - | - | - | - | - | - | - | - | - | ● | ● | ● | ● | ● | ● | ● | ● |
● All products are provided with hex socket head cap screw.
● Recommended tolerance for shaft diameters is h6 and h7.
● A set of hubs with set screw type for one side and clamping type for the other side is available upon request.
● Bore and keyway modifications are available on request. Please take advantage of our modification services.
● For the shaft insertion amount to the coupling, see Mounting/maintenance. ⇒Mounting and Maintenance
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 |
| 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)
Slip torque
As in the table below, the clamping type MOM-C has different slip torque according to the bore diameter. Take care during selection.Unit : N・m
| Part Number | Bore Diameter | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 5 | 6 | 6.35 | 8 | 10 | 12 | 14 | 15 | 16 | 18 | 20 | 22 | 24 | 25 | 28 | 30 | 35 | |
| MOM-15C | 0.3 | 0.5 | 0.8 | 1 | |||||||||||||||
| MOM-17C | 2.1 | 3.5 | 3.7 | ||||||||||||||||
| MOM-20C | 3.8 | 6 | 6 | 6.8 | 7.5 | ||||||||||||||
| MOM-26C | 5.4 | 5.4 | 5.8 | 6.6 | 8.7 | ||||||||||||||
| MOM-30C | 7.4 | 12 | 14 | 15 | |||||||||||||||
| MOM-34C | 13 | 13 | 15 | 16 | 16 | ||||||||||||||
| MOM-38C | 16 | 18 | 20 | 23 | 25 | 28 | 31 | ||||||||||||
| MOM-45C | 47 | 48 | 56 | 56 | 57 | 62 | |||||||||||||
| MOM-55C | 42 | 54 | 55 | 56 | 89 | 93 | 97 | ||||||||||||
| MOM-70C | 62 | 92 | 95 | 97 | 100 | 110 | 120 | 130 | |||||||||||
These are test values based on the conditions of shaft dimensional allowance: h7, hardness: 34-40 HRC, and screw tightening torque of the values described in MOM-C dimension tables. They are not guaranteed values.
Slip torque changes with usage conditions. Carry out tests under conditions similar to actual conditions in advance.
Structure
Set Screw Type
MOM MOM
Clamping Type
MOM-C MOM-C
Set Screws + Key Type
MOM-K MOM-K
Clamping + Key Type
MOM-CK MOM-CK
Material/Finish
| MOM-C | |
|---|---|
| Hub | S45C Ferrosoferric Oxide Film (Black) |
| Spacer | FCD400 Ferrosoferric Oxide Film (Black) |
| Pin | Polyacetal |
| Hex Socket Set Screw | SCM435 Ferrosoferric Oxide Film (Black) |
| Hex Socket Head Cap Screw | SCM435 Ferrosoferric Oxide Film (Black) |
| Grease | Lithium Soap Grease Nippeco DXL-No.1 Made by Nippeco |
Characteristics
- Applicable motors
| MOM | |
|---|---|
| Servomotor | ● |
| Stepping Motor | ● |
| General-purpose Motor | ◎ |
- Property
| MOM | |
|---|---|
| High Torque | ◎ |
| High Torsional Stiffness | ◎ |
| Allowable Misalignment | ○ |
- This is an oldham type flexible coupling.
- FCD400 is adopted in the spacer. Suitable for low-speed and high-torque specification.
- High performance grease is applied in the gap between hubs and the spacer in order to prevent sticking.
- Slippage of hubs and a spacer allows large eccentricity and angular misalignment to be accepted.
- A projection placed in the spacer (resin pin) allows angular misalignment to be effortlessly accepted.
- The grease accumulated in a grease hole will gradually seep out during operation, thereby maintaining the lubrication property over a long period.
Application
Mixer / Pump / Small power press / GrinderPrecautions for Use
In case of mounting on D-cut shaft, be careful about the position of the D-cut surface of the shaft. ⇒Mounting and Maintenance
There are sizes where the hex socket head bolt exceeds the outer diameter of the coupling and the rotating diameter is larger than the outer diameter. Please be careful of the interference of coupling. Rotation Diameter
Selection
Selection Based on Shaft Diameter and Rated Torque
The area bounded by the shaft diameter and rated torque indicates the selection size.
Selection Example
In case of selected parameters of shaft diameter of φ6 and load torque of 4N•m, the selected size is MOM-17.Comparison of Rated Torque
Comparison of Static Torsional Stiffness
Change in static torsional stiffness due to temperature
This is a value under the condition where the static torsional stiffness at 20°C is 100%. The change of MOM in torsional stiffness due to temperature is small and the change in responsiveness is extremely small.If the unit is used under higher temperature, be careful about misalignment due to elongation or deflection of the shaft associated with thermal expansion.
Max. Lateral Misalignment
MOM's max. lateral misalignment varies depending on the load torque and revolution.
- Example
When load torque is 25 N•m and revolution is 1000 min-1, the max. lateral misalignment of MOM-55 is 0.5 mm.
