• Couplings
  • Slit Type


Flexible Couplings - Slit Type - Clamping Type

  • Zero Backlash
  • High torsional rigidity
  • Single-Piece Construction

Dimension Drawing

MSX-CFlexible Couplings - Slit Type - Clamping Type寸法図

Part Number ALWFGM Screw Tightening
Torque (N・m)
Add to Cart
MSX-39C-14-14 39 13.5 40 6.75 14 M4 2.5 90.86 CAD Cart

Part Number Max. Bore Diameter
Max. Rotational Frequency
Moment of
Max. Lateral Misalignment
Max. Angular
Max. Axial
(g) *2
MSX-39C-14-14 20 6 16000 2.3×10-5 4100 0.05 0.5 ±0.1 88

*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.


  • Recommended Applicable Motor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

  • Property
Zero Backlash
High Torque
High Torsional Stiffness

◎: Excellent ○: Very good

  • This is a metal spring coupling with single-piece construction. A slit is inserted into a cylindrical material.
  • It has an extremely high torsional stiffness and low moment of inertia.
  • Extra super duralumin (A7075) featuring the highest strength among aluminum alloy is adopted.
  • A plate spring formed by a slit allows eccentricity, angular misalignment, and end-play to be accepted.


Main Body A7075
Hex Socket Set Screw SCM435
Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)


Set Screw Type


MSX/MSX-C_CFlexible Couplings - Slit Type

Clamping Type


MSX/MSX-C_CFlexible Couplings - Slit Type


Actuator / High precision XY stage / Index table

Precautions 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 Based on Shaft Diameter and Rated Torque

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

MSX/MSX-C_CFlexible Couplings - Slit Type

Selection Example

In case of selected parameters of shaft diameter of φ 15 and load torque of 2 N•m, the selected size is MSX-34or MSX-34C.

Selection Based on the Rated Output of the Servomotor

Rated Output
Servomotor Specifications*1 Selection Size
Diameter of Motor Shaft
Rated Torque
Instantaneous Max. Torque
Set Screw Type Clamping Type
10 5 - 6 0.032 0.096 MSX-16 MSX-16C
20 5 - 6 0.064 0.19 MSX-16 MSX-16C
30 5 - 7 0.096 0.29 MSX-19 MSX-19C
50 6 - 8 0.16 0.48 MSX-19 MSX-19C
100 8 0.32 0.95 MSX-19 MSX-19C
200 9 - 14 0.64 1.9 MSX-29 MSX-34C
400 14 1.3 3.8 MSX-39 MSX-39C
750 16 - 19 2.4 7.2 MSX-44 MSX-44C

*1: Motor specifications are based on general values. For details, see the motor manufacturer's catalogs. This is the size for cases where devices such as reduction gears are not used.

Eccentric Reaction Force

MSX/MSX-C_TTechnical Information

Thrust reaction force

MSX/MSX-C_TTechnical Information

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 MSX 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.

MSX/MSX-C_TTechnical Information

Static torsional stiffness comparison (slit-type)

MSX have high static torsional stiffness and responsiveness. Optimal for high-speed and precision positioning for servomotors, etc.

MSX/MSX-C_TTechnical Information

Related Services

Product List

Click here to see MSX-39C

Click here to see MSX-C

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