• Couplings
  • High Gain Rubber Type


Flexible Couplings - The Vibration-Absorption Capable Disk Type

  • Zero Backlash
  • High torsional rigidity
  • High Torque

Dimension Drawing

XGHW-CFlexible Couplings - The Vibration-Absorption Capable Disk Type寸法図


Part Number AA1L1L2WEHF1F2GM Screw Tightening
Torque (N・m)
Standard Bore Diameter
D2 (Inertial Rotor Side)
Add to Cart Additional Modification
XGHW-27C 19 27 9.2 13.2 29.7 8.5 10 2.6 6.6 7 M2 0.5 - 80.14 CAD Cart       

● Specify the bore diameter in the order D1-D2 (inertial rotor side).
Append the identification code J after the bore diameter of D2 (inertial rotor side).

Example: XGHW-27C-6-8J

Part Number Max. Bore Diameter
Max. Rotational Frequency
Moment of
Max. Eccentricity
Max. Angular
Max. Axial
(g) *2
XGHW-27C 8 1.5 23000 4.6×10-6 300 0.12 2 ±0.2 45

*1: Correction of rated 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.

*2: These are values with max. bore diameter.

Slip torque

As in the table below, the clamping type XGHW-C has different slip torque according to the bore diameter. Take care during selection.

Unit : N・m

Outside Diameter Bore Diameter (mm)
3 4 5 6 6.35 8 9.525 10 11
27 0.7 1.7 3
36 2 2.9 4 4.2 5.8
41 3.5 4.9 5.5 7.9 10 11 12
49 6 8 13 18 19 23

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 XGHW-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.


Clamping Type XGHW-C


XGHW-C_CFlexible Couplings - The Vibration-Absorption Capable Disk Type


Hub A2017
Spacer A2017
Disk Fixing Bolt SCM435
Ferrosoferric Oxide Film (Black)
Disk SUS304
Collar SUS304
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)
Inertial Rotor S45C
Electroless Nickel Plating
Elastic Body FKM


  • Recommended Applicable Motor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

  • Property
Zero Backlash
High-gain Supported
High Torque
High Torsional Stiffness
Allowable Misalignment
Vibration Absorption Characteristics
Allowable Operating Temperature -10°C to 60°C

◎: Excellent ○: Very good

  • Flexible couplings with vibration absorption function added to high rigidity couplings.
  • A structure with both high rigidity and vibration absorption. The individual dynamic vibration absorber*1 is separate from the inertial rotor and elastic body in order to achieve vibration absorption.

XGHW-C_CFlexible Couplings - The Vibration-Absorption Capable Disk Type

*1: The mechanism for suppressing resonant vibration phenomena is achieved by connecting the dynamic vibration absorber to the auxiliary inertial body via the elastic body.

  • Does not use resin elastic materials for the rotation transmission system from the motor shaft hub to the driven shaft hub, for high rigidity.

XGHW-C_CFlexible Couplings - The Vibration-Absorption Capable Disk Type

  • Achieves high positioning accuracy under high loads, in addition to high servomotor gain.


Actuator / Surface-mount machine / High precision XY stage / Index table

Precautions for Use

When installing, be careful not to apply excessive torque, loads or forces to the inertial body. Doing so may result in the inertial body detaching.


Selection Based on Shaft Diameter and Rated Torque

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

XGHW-C_CFlexible Couplings - The Vibration-Absorption Capable Disk Type

Selection Example

In case of selected parameters of shaft diameter of φ14 and load torque of 3 N•m, the selected size is XGHW-41C.

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
50 6-8 0.16 0.48 27C
100 8 0.32 1.1 27C
200 9-14 0.64 2.2 36C
400 14 1.3 4.5 41C
750 16-19 2.4 8.4 49C

*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

XGHW-C_TTechnical Information

Thrust reaction force

XGHW-C_TTechnical Information

Productivity and Stabilization Time

In a production facility which uses servomotors, single-axis actuators and ball screws, the key to improved productivity is operating these components accurately, as directed by a program. However, occasionally the command execution may be delayed.
For example, when trying to stop the actuator at a predetermined position, sometimes it will stop later than the command, which we refer to as a delay in stabilization time. Since the operation does not shift to the next process until the actuator completely stops, it is important to shorten stabilization time and thereby improve productivity.

XGHW-C_TTechnical Information

Gain and Stabilization Time of Servomotor

This shows how the servomotor gain movement follows the command.
Increasing the gain helps to reduce stabilization time, but increasing it too far causes hunting, making servomotor control impossible.
Increasing the gain while suppressing hunting requires fine adjustment of the servomotor parameters.
However, when a servomotor is combined with a coupling with a metal disk type in the elastic segment, raising the gain tends to cause hunting, making it difficult to resolve the problem by fine adjustments to parameters.
When hunting occurs, it is generally recommended to change to a coupling with higher rigidity to increase the rigidity of the rotating system.
However, in reality, it may not be effective to increase the rigidity of the entire rotating system including the ball screw simply by increasing coupling rigidity.

XGHW-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 XGHW-C in torsional stiffness due to temperature is small and the change in positioning accuracy 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.

XGHW-C_TTechnical Information

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