• Couplings
  • Disk Type


Flexible Couplings - Disk Type - Clamping Type

  • Zero Backlash
  • High torsional rigidity
  • High Torque

Dimension Drawing

XHW-CFlexible Couplings - Disk Type寸法図

XHW-CFlexible Couplings - Disk Type寸法図

Part Number ALEWFGM Screw Tightening
Torque (N・m)
Add to Cart
XHW-34C-6-11 34 12.5 16.5 36.8 3.75 13 M3 1.5 68.05 CAD Cart

Part Number Slip TorqueMax. Bore Diameter
Max. Rotational Frequency
Moment of
Max. Lateral Misalignment
Max. Angular
Max. Axial
(g) *2
XHW-34C-6-11 4.9 16 6.3 18000 1.3×10-5 2500 0.2 2 ±0.5 75

*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. XHW-C

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

Slip torque

As in the table below, the clamping types XHW-C and XHW-C-L have 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 12 14 15 16 25 28 30 32 35 38 40 42 45
15 0.7
19 0.7 1.7 3
25 2.5 3.6 4.7 5
27 2 2.9 4 4.2 5.8
34 3.5 4.9 5.5 7.9 10 11 12
39 6 8 13 18 19 23
44 8 13 15 20 26
56 22 34 37 45 55 66
64 23 42 60 88
79 140 150 180
98 120 140 150 170 190 210 220 240 260

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 XHW-CXHW-C-L 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 TypeXHW-CXHW-C-L

XHW-C Standard Type
XHW-C-L Long Type

XHW-C/XHW-C-L/XHW-AC_CFlexible Couplings - Disk Type

Adapter + Clamping Type


XHW-C/XHW-C-L/XHW-AC_CFlexible Couplings - Disk Type


Hub A2017
Spacer A2017
Disk Fixing Bolts SCM435
Ferrosoferric Oxide Film (Black)
Disk SUS304
Collar SUS304
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)


  • 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

◎: Excellent ○: Very good

  • This is a disk type flexible coupling.
  • High-torque specification with rated torque 1.5 times higher than conventional products.
  • This is the most appropriate for a servomotor with instantaneous max. torque of 350%.
  • The stainless steel disk allows eccentricity, angular alignment, and end-play.
  • Standardized XHW-AC adapter type that also supports 1/10 taper shafts of servomotors.


Actuator / Surface-mount machine / 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.

XHW-C/XHW-C-L/XHW-AC_CFlexible Couplings - Disk Type

XHW-C/XHW-C-L/XHW-AC_CFlexible Couplings - Disk Type

XHW-C/XHW-C-L/XHW-AC_CFlexible Couplings - 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 XHW-27C.

Selection Based on the Rated Output of the Servomotor

XHW-C supports the servomotor with instantaneous max. torque increased to 350% of the rated torque and the size can be more reduced than the size of conventional product XBW-C.
Rated Output
Servomotor Type Servomotor Specifications*1 Selection Size
Mitsubishi Electric Corporation YASKAWA Electric Corporation SANYO DENKI Co., Ltd. KEYENCE CORPORATION Diameter of Motor Shaft
Rated Torque
Instantaneous Max. Torque
100 HG-KR SGMJV R2 SV 8 0.32 1.1 XHW-19C XBW-25C
200 14 0.64 2.2 XHW-27C XBW-34C
400 14 1.3 4.5 XHW-34C XBW-39C
750 16 - 19 2.4 8.4 XHW-39C XBW-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

XHW-C/XHW-C-L/XHW-AC_TTechnical Information

XHW-C/XHW-C-L/XHW-AC_TTechnical Information

Thrust reaction force

XHW-C/XHW-C-L/XHW-AC_TTechnical Information

XHW-C/XHW-C-L/XHW-AC_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 XHW-CXHW-AC 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.

XHW-C/XHW-C-L/XHW-AC_TTechnical Information

Static torsional stiffness comparison (double disc-type)

XHW-C XHW-AC has high static torsional stiffness and responsiveness.
Optimal for high-speed and precision positioning for servomotors, etc.

XHW-C/XHW-C-L/XHW-AC_TTechnical Information

Related Services

Product List

Click here to see XHW-34C

Click here to see XHW-C

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