• Couplings
  • Disk Type


Flexible Couplings - Single-Disk Type - Clamping Type

  • Zero Backlash
  • High torsional rigidity
  • High Torque

Dimension Drawing

XBSS-CFlexible Couplings - Single-Disk Type - Clamping Type寸法図

Part Number ALWFGM Screw Tightening
Torque (N・m)
Add to Cart
XBSS-44C2A-10-12 44 15 32.8 5 17 M4 3.5 234.38 CAD Cart

Part Number Slip TorqueMax. Bore Diameter
Max. Rotational Frequency
Moment of
Max. Angular
Mass (g)
XBSS-44C2A-10-12 6 22 5.6 14000 3.9×10-5 7000 1 305

※ The selected shaft's slip torque is smaller than the coupling's rated torque. Please note.
*1: Correction of rated torque due to load fluctuation is not required. For more detailed information, please refer to Selection Guidelines.

※ The shaft's slip torque may be smaller than the coupling's rated torque depending on the shaft bore. XBS-C

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

Slip torque

As in the table below, the clamping types XBS-C and XBSS-C have different slip torque according to the bore diameter. Take care during selection.

Unit : N・m

Part Number Bore Diameter (mm)
3 4 6 8 10 11 14 15
XBS-15C2 1
XBS-19C2 1.6
XBS-34C3 5.2 6
XBS-44C2 15
XBS-56C3 25 32
XBS-68C5 80 100

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 XBS-CXBSS-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.

Unit : N・m

Part Number Bore Diameter (mm)
4 6 8 10 11 12 14 15
XBSS-19C2A 1
XBSS-34C3A 5
XBSS-39C2A 5.5 8
XBSS-44C2A 4.5 6 10
XBSS-56C3A 9 13 18 25 28


Clamping TypeXBS-CXBSS-C

XBS-C Aluminum Alloy Hub
XBSS-C Made of All Stainless Steel

XBS-C/XBSS-C_CFlexible Couplings - Single-Disk Type


Hub SUS303
Disk Fixing Bolts SUSXM7
Disk SUS304
Collar SUS304
Hex Socket Head Cap Screw SUSXM7


  • Recommended Applicable Motor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

  • Property
Zero Backlash
High Torque
High Torsional Stiffness
Allowable Misalignment
Corrosion Resistance (All S.S.) -

◎: Excellent ○: Very good

  • This is a disk type flexible coupling.
  • It has compact design with short entire length.
  • The stainless steel disk allows eccentricity, and angular misalignment, and end-play.
  • Wide variation of outside diameter φ 15 - φ 104 and bore diameter φ 3 - φ 50.
  • Extra super duralumin (A7075) featuring the highest strength among aluminum alloy is adopted for XBS-C hubs.
  • XBSS-Cis the all stainless steel type with stainless steel hubs.


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


XBS-C/XBSS-C_CFlexible Couplings - Single-Disk Type

XBS-C/XBSS-C_CFlexible Couplings - Single-Disk Type

XBS-C/XBSS-C_CFlexible Couplings - Single-Disk Type

Selection Example

In case of selected parameters of shaft diameter of φ30 and load torque of 40 N•m, the selected size is XBS-68C5.

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
Aluminum Alloy Hub Made of All Stainless Steel
10 5 - 6 0.032 0.096 XBS-15C XBSS-15C
20 5 - 6 0.064 0.19 XBS-15C XBSS-15C
30 5 - 7 0.096 0.29 XBS-19C XBSS-19C
50 6 - 8 0.16 0.48 XBS-19C XBSS-19C
100 8 0.32 0.95 XBS-19C XBSS-25C
200 9 - 14 0.64 1.9 XBS-27C XBSS-34C
400 14 1.3 3.8 XBS-34C XBSS-39C
750 16 - 19 2.4 7.2 XBS-39C XBSS-56C

*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.

Thrust reaction force

XBS-C/XBSS-C_TTechnical Information

XBS-C/XBSS-C_TTechnical Information

XBS-C/XBSS-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 XBS-C and XBSS-C 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.

XBS-C/XBSS-C_TTechnical Information

Static torsional stiffness comparison (single disc-type)

XBS-C/XBSS-C_TTechnical Information

Related Products

The Single-Disk type Flexible Coupling XHS-C is compatible with the servomotor with 350% instantaneous max. torque is available.

XBS-C/XBSS-C_CFlexible Couplings - Single-Disk Type

Product List

Click here to see XBSS-44C2A

Click here to see XBSS-C

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