• Couplings
  • Oldham Type

MOM-17K-6-8

Flexible Couplings - Oldham Type - Set Screw + Key Type

  • High torsional rigidity
  • High Torque

Dimension Drawing

MOM-KFlexible Couplings - Oldham Type - Set Screw + Key Type寸法図

Specs/CAD

Part Number ALWEFM Screw Tightening
Torque (N・m)
Price
(USD)
CAD Add to Cart
MOM-17K-6-8 17 6.7 20.4 7.3 3.35 M3 0.7 60.96 CAD Cart

Part Number Slip TorqueMax. 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. Angular
Misalignment
(°)
Max. Lateral Misalignment
(mm) *3
Mass
(g) *2
MOM-17K-6-8 - 8 5.5 11 2000 1.1×10-6 1300 2 0.3 26

*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.

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

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-K
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.

Details of Shaft Hole

MOM-KFlexible Couplings - Oldham Type - Set Screw + Key Type

Unit : mm

Standard Bore Diameter
D
Keyway Key
b t Nominal Dimension
b x h
Standard Dimension Allowance
(JS9)
Standard Dimension Allowance
6・6.35 2 ±0.0125 1.0 0 - +0.1 2 × 2
8 3 ±0.0125 1.4 0 - +0.1 3 × 3
10・12 4 ±0.0150 1.8 0 - +0.1 4 × 4
14・15・16 5 ±0.0150 2.3 0 - +0.1 5 × 5
18・20・22 6 ±0.0150 2.8 0 - +0.1 6 × 6
24・25・28・30 8 ±0.0180 3.3 0 - +0.2 8 × 7
35 10 ±0.0180 3.3 0 - +0.2 10 × 8

Excerpt from JIS B 1301


Comparison of Rated Torque

MOM-KFlexible Couplings - Oldham Type - Set Screw + Key Type

Comparison of Static Torsional Stiffness

MOM-KFlexible Couplings - Oldham Type - Set Screw + Key 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

  • 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


Customer Service

  • Usage Method
  • Technical Question
  • Customization Products

NBK America LLC

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