• Couplings
  • Slit Type

MWSS

Flexible Couplings - Slit Type - Set Screw Type

Safety PrecautionsGlossaryMounting/maintenance

RoHS Compliant

  • Zero Backlash
  • High Torque
  • Single-Piece Construction
MWS/MWSS/MWS-C/MWSS-C_CFlexible Couplings - Slit Type

Dimension Drawing

MWSSFlexible 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

Part Number ALWFM Screw Tightening
Torque (N・m)		Standard Bore Diameter (Dimensional Allowance H8)
D1-D2		 Price
(USD)		 CAD
Download		 Add to Cart Additional Modification
MWSS-8 8 3.4 10 1.7 M2 0.3 35.71 CAD Cart       
MWSS-12 12 5.2 14 2.5 M2.5 0.5 39.79 CAD Cart       
MWSS-16 16 6.8 18 3 M3 0.7 42.24 CAD Cart       
MWSS-20 20 7.65 20 3 M3 0.7 45.50 CAD Cart       
MWSS-25 25 9.6 25 4 M4 1.7 52.58 CAD Cart       
MWSS-32 32 12.6 32 6 M4 1.7 67.69 CAD Cart       

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. Angular
Misalignment
(°)		 Max. Axial
Misalignment
(mm)		Mass
(g) ＊2
MWSS-8 4 0.2 78000 2.4×10-8 49 1 ±0.1 2.7
MWSS-12 6 0.3 52000 1.8×10-7 140 1 ±0.1 7.8
MWSS-16 8 0.5 39000 7.2×10-7 240 1 ±0.1 18
MWSS-20 10 1 31000 2.0×10-6 330 1 ±0.1 32
MWSS-25 12 2 25000 6.1×10-6 720 1 ±0.2 63
MWSS-32 16 3.5 19000 2.1×10-5 1300 1 ±0.2 130

＊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
MWSS-8 2-2 3-3      
MWSS-12 4-4 4-5 4.5-5 5-5  
MWSS-16 5-5 5-6 6-6    
MWSS-20 5-6 5-8 6-6 6-8 8-8
MWSS-25 5-6 6-6 6-8 8-8 8-10
10-10        
MWSS-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.


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

Part Number
Amount
Price（＄）

Check other products Cart

　　　　　　

Additional Modification Service

Modified Part Number

Enter the desired bore diameter and then click [Check Modified Part Number].

Standard bore diameter(D1) Standard bore diameter(D2) Modified Part Number Price Add to cart

unit:mm
Shaft Hole
D1D2		 keyway Key
b t Nominal Dimension
b×h
Basic Dimension Allowance
(JS9)		 Basic Dimension Allowance
6 7       2 ±0.0125 1.0 +0.1
0 		2×2
8 9 10     3 ±0.0125 1.4 3×3
11 12       4 ±0.0150 1.8 4×4
13 14 15 16 17 5 ±0.0150 2.3 5×5
18 19 20 22   6 ±0.0150 2.8 6×6
24 25 28 30   8 ±0.0180 3.3 +0.2
0 		8×7
32 35 36 38   10 ±0.0180 3.3 10×8
40 42 44     12 ±0.0215 3.3 12×8
45 48 50     14 ±0.0215 3.8 14×9

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

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

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 Services

Product List

Most Read

What is the key to speeding up the Servo System？

This page describes couplings that increase servo system speed. If you haven't heard about the progress made with couplings that connect motors and actuators, you may be missing an opportunity to get better performance out of your servo system.

Rotation shaft vibration must be suppressed 【Productivity increase】

Introducing case studies using couplings that control vibrations to improve productivity.

Explanation of Terminology

Coupling, Explanation of Terminology

Mounting and Maintenance

Mounting and Maintenance