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  • Oldham Type

Flexible Couplings - Oldham Type - Set Screw Type

MOM

  • High torsional rigidity
  • High Torque

Dimension Drawing

MOMFlexible Couplings - Oldham Type - Set Screw Type寸法図

*1: In a case where the bore diameter is φ 4 or less, the set screw is used in only one place.

Specs/CAD

Part Number ALWEFM Screw Tightening
Torque (N・m)
Standard Bore Diameter (Dimensional Allowance H8)
D1-D2
Price
(USD)
CAD
Download
Add to Cart Additional Modification
MOM-12 12 5.2 15 5.9 2.6 M2.5 0.5 - 32.79 CAD Cart       
MOM-15 15 5.4 16.6 6.9 2.7 M3 0.7 - 38.74 CAD Cart       
MOM-17 17 6.7 20.4 7.3 3.35 M3 0.7 - 42.27 CAD Cart       
MOM-20 20 7 22 11.1 3.5 M3 0.7 - 46.59 CAD Cart       
MOM-26 26 9 26.6 13.3 4.5 M4 1.7 - 54.07 CAD Cart       
MOM-30 30 12 34 15.5 6 M4 1.7 - 60.41 CAD Cart       
MOM-34 34 13 35 17.5 6.5 M5 4 - 66.73 CAD Cart       
MOM-38 38 15 40.5 21.5 7.5 M5 4 - 79.04 CAD Cart       
MOM-45 45 15 45.2 24.3 7.5 M5 4 - 127.71 CAD Cart       
MOM-55 55 17 51 27.7 8.5 M6 7 - 337.75 CAD Cart       
MOM-70 70 20 58.6 38.5 10 M8 15 - 418.89 CAD Cart       

Part Number Max. Bore Diameter
(mm)
Keyway Additional Modification
Max. Bore Diameter
(mm)
Rated
Torque*1
(N・m)
Max. Torque
(N・m) *1
Max. Rotational Frequency
(min-1)
Moment of
Inertia
(kg・m2)*2
Static
Torsional
Stiffness
(N・m/rad)
Max. Lateral Misalignment
(mm) *3
Max. Angular
Misalignment
(°)
Mass
(g) *2
MOM-12 6 - 2.7 5.4 2000 2.0×10-7 420 0.3 2 9
MOM-15 8 6 3.3 6.6 2000 5.5×10-7 870 0.3 2 15
MOM-17 10 8 5.5 11 2000 1.1×10-6 1300 0.3 2 24
MOM-20 12 10 7.7 15.4 2000 2.3×10-6 1700 0.4 2 34
MOM-26 15 12 11 22 2000 8.1×10-6 3200 0.5 2 72
MOM-30 18 15 26 52 2000 1.8×10-5 4600 0.6 2 119
MOM-34 20 16 35 70 2000 3.1×10-5 6000 0.7 2 159
MOM-38 22 20 55 110 2000 5.5×10-5 7400 0.8 2 230
MOM-45 25 22 66 132 2000 1.2×10-4 16000 1 2 364
MOM-55 30 28 99 198 2000 3.0×10-4 30000 1.2 2 636
MOM-70 42 35 176 352 2000 8.9×10-4 46000 1.4 2 1090

*1: Correction of rated torque and max. torque due to load fluctuation is not required.
*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 (Dimensional Allowance H8)
D1・D2
3 4 5 6 6.35 8 10 12 14 15 16 18 20 22 24 25 28 30 35 38 40 42
MOM-12 - - - - - - - - - - - - - - - - - -
MOM-15 - - - - - - - - - - - - - - - - -
MOM-17 - - - - - - - - - - - - - - - - -
MOM-20 - - - - - - - - - - - - - - - -
MOM-26 - - - - - - - - - - - - - - -
MOM-30 - - - - - - - - - - - - - - -
MOM-34 - - - - - - - - - - - - - - -
MOM-38 - - - - - - - - - - - - - -
MOM-45 - - - - - - - - - - - - -
MOM-55 - - - - - - - - - - - - -
MOM-70 - - - - - - - - - - -

● 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


Structure

Set Screw Type

MOM MOM

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Clamping Type

MOM-C MOM-C

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Set Screws + Key Type

MOM-K MOM-K

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

Clamping + Key Type

MOM-CK MOM-CK

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type


Material/Finish

MOM
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

  • Recommended Applicable Motor
MOM
Servomotor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

  • Property
MOM
High Torque
High Torsional Stiffness
Allowable Misalignment

◎: Excellent ○: Very good

  • 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.

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type


Application

Mixer / Pump / Small power press / Grinder

Precautions for Use

Please apply grease periodically in order to prevent sticking of hubs and a spacer.

Selection

Selection Based on Shaft Diameter and Rated Torque

The area bounded by the shaft diameter and rated torque indicates the selection size.

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

MOM/MOM-C/MOM-K/MOM-CK_CFlexible Couplings - Oldham Type

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

MOMFlexible Couplings - Oldham Type - Set Screw Type

Comparison of Static Torsional Stiffness

MOMFlexible Couplings - Oldham Type - Set Screw Type


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.

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information


Max. Lateral Misalignment

MOM's max. lateral misalignment varies depending on the load torque and revolution.

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information

  • 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.

MOM/MOM-C/MOM-K/MOM-CK_TTechnical Information


Related Services

Product List

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