• Couplings
  • Slit Type


Flexible Couplings - Slit Type - Set Screw Type

  • Zero Backlash
  • High Torque
  • Single-Piece Construction

Part Number ALWFM Screw Tightening
Torque (N・m)
Add to Cart
MWSS-20-5-6 20 7.65 20 3 M3 0.7 50.63 CAD Cart

Part Number Max. Bore Diameter
Max. Rotational Frequency
Moment of
Max. Angular
Max. Axial
(g) *2
MWSS-20-5-6 10 1 31000 2.0×10-6 330 1 ±0.1 32

*1: Correction of rated torque due to load fluctuation is not required.
*2: These are values with max. bore diameter.

Dimension Drawing

MWSSFlexible Couplings - Slit Type - Set Screw Type寸法図

*1: E=D2(D2<6)


*2: In a case where the bore diameter is φ 4 or less, the set screw is used in only one place.


  • This is a metal spring coupling with single-piece construction. A slit is inserted into a cylindrical material.
  • A plate spring formed by a slit allows angular misalignment, and end-play to be accepted.
  • There are two types of units made of aluminum alloy or all stainless steel.
  • Property
Zero Backlash
High Torque
High Torsional Stiffness
Corrosion Resistance (All S.S.) -

◎: Excellent ○: Very good

  • Recommended Applicable Motor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available


Main Body SUS303
Hex Socket Set Screw SUSXM7
Hex Socket Head Cap Screw SUSXM7

Slip torque

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

Unit : N・m

Part Number Bore Diameter (mm)
4 4.5 5 6 8 10 12 14
MWS-25C 3 3.1 3.5
MWSS-12C 0.3 0.4 0.5
MWSS-20C 0.9 1.9
MWSS-25C 1.2 1.4 1.9 3.1
MWSS-32C 1.9 2.4 3.4 4.1

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 MWS-CMWSS-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.


MWSS-CMade of all stainless steel

MWS/MWSS/MWS-C/MWSS-C_CFlexible Couplings - Slit Type

Clamping TypeMWS-CMWSS-C

MWS-CMade of aluminum alloy

MWS/MWSS/MWS-C/MWSS-C_CFlexible Couplings - Slit Type

Set Screw TypeMWSMWSS

MWS Made of aluminum alloy
MWSS Made of all stainless steel

MWS/MWSS/MWS-C/MWSS-C_CFlexible Couplings - Slit Type


Transport device / XY stage / Parts feeder


Selection Example

In case of selected parameters of shaft diameter of φ 5 and load torque of 0.8 N•m, the selected size forMWSMWSSis MWS-20MWSS-20.

MWS/MWSS/MWS-C/MWSS-C_CFlexible Couplings - Slit Type

MWS/MWSS/MWS-C/MWSS-C_CFlexible Couplings - Slit Type

Selection Based on Shaft Diameter and Rated Torque

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

Thrust reaction force

MWS/MWSS/MWS-C/MWSS-C_TTechnical Information

MWS/MWSS/MWS-C/MWSS-C_TTechnical Information

Change in static torsional stiffness due to temperature

MWS/MWSS/MWS-C/MWSS-C_TTechnical Information

This is a value under the condition where the static torsional stiffness at 20°C is 100%. The change of MWS and MWSS 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.

MWS/MWSS/MWS-C/MWSS-C_TTechnical Information

Related Products

A slit-type coupling XWSS-C SUS316L material finished with clean washing and clean packaging, which is best suited to FPD and semiconductor manufacturing equipment, is available.

MWS/MWSS/MWS-C/MWSS-C_CFlexible Couplings - Slit Type

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