• Couplings
  • Slit Type

MSTS-C

Flexible Couplings - Slit Type - Clamping Type

RoHS Compliant

  • Zero Backlash
  • High torsional rigidity
  • Single-Piece Construction
MSTS-CFlexible Couplings - Slit Type - Clamping Type

Dimension Drawing

MSTS-CFlexible Couplings - Slit Type - Clamping Type寸法図

＊1：　E＝D2(D2＜6)

E＝D2+0.5(D2≥6)

MSTS-CFlexible Couplings - Slit Type - Clamping Type寸法図

＊1：　E＝D2(D2＜6)

E＝D2+0.5(D2≥6)

Specs/CAD

Part Number ALWFGM Screw Tightening
Torque (N・m)		Standard Bore Diameter
D1-D2		 Price
(USD)		 CAD Add to Cart Additional Modification
MSTS-12C 12 5 18.5 2.5 4 M2 0.5 78.45 CAD Cart       
MSTS-16C 16 6.5 23 3.25 5 M2.5 1 88.04 CAD Cart       
MSTS-20C 20 7.5 26 3.75 6.5 M2.5 1 96.84 CAD Cart       
MSTS-25C 25 8.5 31 4.25 9 M3 1.5 107.01 CAD Cart       
MSTS-32C 32 12 41 6 11 M4 2.5 118.43 CAD Cart       
MSTS-40C 40 17 56 8.5 14 M5 4 272.10 CAD Cart       
MSTS-50C 50 21 71 10.5 18 M6 8 468.17 CAD Cart       
MSTS-63C 63 26 90 13 24 M8 16 969.72 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
MSTS-12C 5 0.3 52000 2.2×10-7 64 0.1 2 ±0.2 10
MSTS-16C 6 0.5 39000 9.0×10-7 85 0.1 2 ±0.3 25
MSTS-20C 8 1 31000 2.5×10-6 250 0.1 2 ±0.3 43
MSTS-25C 10 2 25000 7.1×10-6 330 0.15 2 ±0.4 78
MSTS-32C 14 3.5 19000 2.7×10-5 850 0.15 2 ±0.5 170
MSTS-40C 18 8 15000 9.0×10-5 1000 0.2 2 ±0.5 370
MSTS-50C 22 15 12000 2.8×10-4 1400 0.2 2 ±0.5 750
MSTS-63C 30 35 10000 8.8×10-4 1800 0.2 2 ±0.5 1400

＊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. MSTMSTSMST-CMSTS-CMST-K

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

Part Number Standard Bore Diameter D1・D2
MSTS-12C 4-4 4-5 4.5-5 5-5  
MSTS-16C 4.5-5 4.5-6 5-5 5-6 6-6
MSTS-20C 5-6 5-6.35 5-7 5-8 6-6
6-6.35 6-7 6-8 6.35-8 8-8
MSTS-25C 5-6 6-6 6-6.35 6-8 6-10
6.35-8 6.35-10 8-8 8-9.525 8-10
9.525-10 10-10      
MSTS-32C 8-8 8-9.525 8-10 8-12 9.525-10
9.525-12 10-10 10-11 10-12 10-14
12-12 12-14      
MSTS-40C 8-8 8-10 10-10 12-12 12-14
14-14 14-16 15-15 15-16 16-16
MSTS-50C 12-14 14-14 15-15 16-16 18-18
MSTS-63C 14-14 16-16 18-18    

● All products are provided with hex socket head cap screw.
● 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 D1･D2
MSTS-12C-4-4 4-4
4-5
4.5-5
5-5
MSTS-12C-4-5 4-4
4-5
4.5-5
5-5
MSTS-12C-4.5-5 4-4
4-5
4.5-5
5-5
MSTS-12C-5-5 4-4
4-5
4.5-5
5-5
MSTS-16C-4.5-5 4.5-5
4.5-6
5-5
5-6
6-6
MSTS-16C-4.5-6 4.5-5
4.5-6
5-5
5-6
6-6
MSTS-16C-5-5 4.5-5
4.5-6
5-5
5-6
6-6
MSTS-16C-5-6 4.5-5
4.5-6
5-5
5-6
6-6
MSTS-16C-6-6 4.5-5
4.5-6
5-5
5-6
6-6
MSTS-20C-5-6 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-5-6.35 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-5-7 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-5-8 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-6-6 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-6-6.35 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-6-7 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-6-8 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-6.35-8 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-20C-8-8 5-6
5-6.35
5-7
5-8
6-6
6-6.35
6-7
6-8
6.35-8
8-8
MSTS-25C-5-6 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-6-6 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-6-6.35 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-6-8 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-6-10 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-6.35-8 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-6.35-10 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-8-8 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-8-9.525 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-8-10 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-9.525-10 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-25C-10-10 5-6
6-6
6-6.35
6-8
6-10
6.35-8
6.35-10
8-8
8-9.525
8-10
9.525-10
10-10
MSTS-32C-8-8 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-8-9.525 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-8-10 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-8-12 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-9.525-10 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-9.525-12 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-10-10 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-10-11 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-10-12 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-10-14 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-12-12 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-32C-12-14 8-8
8-9.525
8-10
8-12
9.525-10
9.525-12
10-10
10-11
10-12
10-14
12-12
12-14
MSTS-40C-8-8 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-8-10 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-10-10 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-12-12 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-12-14 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-14-14 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-14-16 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-15-15 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-15-16 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-40C-16-16 8-8
8-10
10-10
12-12
12-14
14-14
14-16
15-15
15-16
16-16
MSTS-50C-12-14 12-14
14-14
15-15
16-16
18-18
MSTS-50C-14-14 12-14
14-14
15-15
16-16
18-18
MSTS-50C-15-15 12-14
14-14
15-15
16-16
18-18
MSTS-50C-16-16 12-14
14-14
15-15
16-16
18-18
MSTS-50C-18-18 12-14
14-14
15-15
16-16
18-18
MSTS-63C-14-14 14-14
16-16
18-18
MSTS-63C-16-16 14-14
16-16
18-18
MSTS-63C-18-18 14-14
16-16
18-18

● All products are provided with hex socket head cap screw.
● 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 MST-C and MSTS-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 6.35 7 8 9.525 10 11 12 14 15 16
MST-25C 3 3.6
MST-32C 4.1 7.3
MST-40C 7.1 14 17 20 24
MST-63C 59 63
MSTS-12C 0.4 0.5
MSTS-16C 0.7 0.8
MSTS-20C 1.2 1.7 1.7 1.7
MSTS-25C 0.7 0.7 0.9 1.7 3.8
MSTS-32C 1.2 2.1 2.7 2.9 5.9
MSTS-40C 8.7 12 12 14
MSTS-50C 22 28
MSTS-63C 28 49

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 MST-CMSTS-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 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

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

MSTS-C
Outside diameter φ12 - φ32

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-KMade of all stainless steel

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


Material/Finish

MSTS-C
Main Body SUS303
Hex Socket Head Cap
Setscrew		 SUSXM7
Hex Socket Head Cap
Screw		 SUSXM7

Characteristics

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

◎: Excellent ○: Very good ●: Available

  • Property
MST MSTS
Zero Backlash ◎ ◎
High Torque ○ ○
High Torsional Stiffness ○ ○
Allowable Misalignment ○ ○
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 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.

Application

Transport device / XY stage / Parts feeder

Precautions for Use

In case of mounting on D-cut shaft, be careful about the position of the D-cut surface of the shaft. ⇒Mounting and Maintenance
There are sizes where the hex socket head bolt exceeds the outer diameter of the coupling and the rotating diameter is larger than the outer diameter. Please be careful of the interference of coupling.

Selection

Selection Based on Shaft Diameter and Rated Torque

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

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 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

Slit Details

MST-C

MSTS-CFlexible Couplings - Slit Type - Clamping Type


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

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

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


Related Products

Slit-type flexible coupling MSX with excellent torsional stiffness is available.
MSX

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

XSTS-C SUS316L material finished with clean washing and clean packaging, which is best suited for FPD and semiconductor manufacturing equipment, is available.
XSTS-C

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


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