• Couplings
  • Slit Type

MWS

Flexible Couplings - Slit Type - Set Screw Type

  • Zero Backlash
  • Single-Piece Construction
  • Low Inertia

Dimension Drawing

MWSFlexible Couplings - Slit Type - Set Screw Type寸法図

*1: E=D2(D2<6)

E=D2+0.5(D2≥6)

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

Specs/CAD

Unit : mm

Part Number A L W F M Screw Tightening
Torque (N・m)
Standard Bore Diameter (Dimensional Allowance H8)
D1-D2
CAD RFQ
MWS-8 8 3.4 10 1.7 M2 0.3 CAD RFQ
MWS-12 12 5.2 14 2.5 M2.5 0.5 CAD RFQ
MWS-16 16 6.8 18 3 M3 0.7 CAD RFQ
MWS-20 20 7.65 20 3 M3 0.7 CAD RFQ
MWS-25 25 9.6 25 4 M4 1.7 CAD RFQ
MWS-32 32 12.6 32 6 M4 1.7 CAD RFQ

Part Number Max. Bore Diameter
(mm)
Rated
Torque*1
(N・m)
Max. Rotational Frequency
(min-1)
Moment of
Inertia
(kg・m2)*2
Static
Torsional
Stiffness
(N・m/rad)
Max. Lateral Misalignment
(mm)
Max. Angular
Misalignment
(°)
Max. Axial
Misalignment
(mm)
Mass
(g) *2
MWS-8 4 0.1 78000 1.0×10-8 24 - 1 ±0.1 1
MWS-12 6 0.4 52000 7.0×10-8 80 - 1 ±0.1 3.1
MWS-16 8 0.5 39000 2.8×10-7 180 - 1 ±0.2 7.4
MWS-20 10 1 31000 7.5×10-7 200 - 1 ±0.2 12
MWS-25 12 2 25000 2.3×10-6 780 - 1 ±0.2 24
MWS-32 16 4 19000 8.0×10-6 1100 - 1 ±0.2 50

*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.

Part Number Standard Bore Diameter (Dimensional Allowance H8)
D1・D2
MWS-8 2-2 3-3      
MWS-12 4-4 4-5 4.5-5 5-5  
MWS-16 4.5-5 5-5 5-6 6-6  
MWS-20 5-6 5-8 6-6 6-8 8-8
MWS-25 5-6 6-6 6-8 8-8 8-10
10-10        
MWS-32 8-8 8-10 10-10 10-12 12-12
12-14        

●All products are provided with hex socket set screws.
● Recommended tolerance for shaft diameters is h6 and h7.
● Bore and keyway modifications are available on request. Please take advantage of our modification services.

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.


Structure

Set Screw TypeMWSMWSS

MWS Made of aluminum alloy
MWSS Made 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

MWSS-CMade of all stainless steel

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


Material/Finish

MWS
Main Body A2017
Anodized
Hex Socket Set Screw SCM435
Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)

Characteristics

  • Recommended Applicable Motor
MWS MWSS
Servomotor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

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

◎: Excellent ○: Very good

  • 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.

Application

Transport device / XY stage / Parts feeder

Selection

Selection Based on Shaft Diameter and Rated Torque

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

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

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

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.

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

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

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.
XSTS-C

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


Related Service

Product List

Customer Service

  • Usage Method
  • Technical Question
  • Customization Products
USA and Canada

NBK America LLC

9:00 to 17:00 on weekdays, Eastern Standard Time

Asia and Europe

Nabeya Bi-tech Kaisha

9:00 to 17:15 on weekdays, Japan Standard Time