• Couplings
  • Slit Type

Flexible Couplings - Slit Type - Set Screw Type

MST

  • Zero Backlash
  • Single-Piece Construction

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
MST-8 8 3.5 14 1.7 M2 0.3 27.65 CAD Cart       
MST-12 12 5 18.5 2.5 M2.5 0.5 28.48 CAD Cart       
MST-16 16 6.5 23 3 M3 0.7 32.72 CAD Cart       
MST-20 20 7.5 26 3 M3 0.7 37.24 CAD Cart       
MST-25 25 8.5 31 4 M4 1.7 42.55 CAD Cart       
MST-32 32 12 41 6 M4 1.7 49.13 CAD Cart       
MST-40 40 17 56 8.5 M5 4 94.38 CAD Cart       
MST-50 50 21 71 10.5 M6 7 147.38 CAD Cart       
MST-63 63 26 90 13 M8 15 216.77 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. Lateral Misalignment
(mm)
Max. Angular
Misalignment
(°)
Max. Axial
Misalignment
(mm)
Mass
(g) *2
MST-8 4 0.1 78000 1.2×10-8 25 0.1 2 ±0.2 1.4
MST-12 6 0.4 52000 8.3×10-8 45 0.1 2 ±0.3 3.7
MST-16 8 0.5 39000 3.3×10-7 80 0.1 2 ±0.4 8.1
MST-20 10 1 31000 9.0×10-7 170 0.1 2 ±0.4 14
MST-25 12 2 25000 2.6×10-6 380 0.15 2 ±0.5 27
MST-32 16 4 19000 9.6×10-6 500 0.15 2 ±0.5 60
MST-40 20 8 15000 3.2×10-5 700 0.2 2 ±0.5 130
MST-50 25 16 12000 1.0×10-4 1800 0.2 2 ±0.5 260
MST-63 35 32 10000 3.2×10-4 3100 0.2 2 ±0.5 490

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

Part Number Standard Bore Diameter (Dimensional Allowance H8)
D1・D2
MST-8 2-2 2-3 3-3    
MST-12 3-3 3-4 3-6 4-4 4-5
4.5-5 5-5 5-6    
MST-16 4-4 4-5 4-6 4.5-5 5-5
5-6 5-8 6-6 6-6.35 6-7
6-8 6.35-8      
MST-20 5-5 5-6 5-8 6-6 6-6.35
6-7 6-8 6-10 6.35-8 8-8
8-10 10-10      
MST-25 5-6 6-6 6-6.35 6-8 6-10
6.35-8 6.35-10 8-8 8-10 8-12
9.525-10 10-10 10-12 12-12  
MST-32 6-8 6.35-8 8-8 8-10 8-12
9.525-12 10-10 10-11 10-12 10-14
12-12 12-14 14-14 14-16  
MST-40 8-9.525 10-10 12-12 14-14 15-15
16-16 18-18      
MST-50 12-12 14-14 15-15 16-18  
MST-63 14-14        

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


Dimension Drawing

MSTFlexible 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.

Structure

MSTS-KMade of all stainless steel

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type

Set Screws + Key TypeMST-KMSTS-K

MST-KMade of aluminum alloy

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type

MSTS-C
Outside diameter φ12 - φ32

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type

Clamping TypeMST-CMSTS-C

MST-C Made of aluminum alloy
MSTS-C Made of all stainless steel
Outside diameter φ40 - φ63

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type

Set Screw TypeMSTMSTS

MST Made of aluminum alloy
MSTS Made of all stainless steel

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type


Material/Finish

MST
Main Body A2017
Anodized
Hex Socket Head Cap
Setscrew
SCM435
Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap
Bolt
SCM435
Ferrosoferric Oxide Film (Black)

Characteristics

  • 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 eccentricity, angular misalignment, and end-play to be accepted.
  • There are two types of units made of aluminum alloy or all stainless steel.
  • Wide variation of outside diameter φ 8 - φ 63.
  • Property
MST MSTS
Zero Backlash
High Torque
High Torsional Stiffness
Allowable Misalignment
Corrosion Resistance (All S.S.) -

◎: Excellent ○: Very good

  • Recommended Applicable Motor
MST MSTS
Servomotor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available


Application

Transport device / XY stage / Parts feeder

Selection

Selection Example

In case of selected parameters of shaft diameter of φ10 and load torque of 1.5 N•m, the selected size forMSTMSTSis MST-25MSTS-25

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_CFlexible Couplings - Slit Type

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_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.

Eccentric Reaction Force

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_TTechnical Information

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_TTechnical Information


Thrust reaction force

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_TTechnical Information

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_TTechnical Information


Change in static torsional stiffness due to temperature

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_TTechnical Information

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

MST/MSTS/MST-C/MSTS-C/MST-K/MSTS-K_TTechnical Information


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