Dimension Drawing
＊1： E＝D2(D2＜6)
E＝D2+0.5(D2≥6)
Specs/CAD
| Part Number | A | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MST-12C | 12 | 5 | 18.5 | 2.5 | 4 | M2 | 0.5 | 43.91 | CAD | Cart | ||
| MST-16C | 16 | 6.5 | 23 | 3.25 | 5 | M2.5 | 1 | 49.12 | CAD | Cart | ||
| MST-20C | 20 | 7.5 | 26 | 3.75 | 6.5 | M2.5 | 1 | 54.74 | CAD | Cart | ||
| MST-25C | 25 | 8.5 | 31 | 4.25 | 9 | M3 | 1.5 | 60.55 | CAD | Cart | ||
| MST-32C | 32 | 12 | 41 | 6 | 11 | M4 | 2.5 | 65.29 | CAD | Cart | ||
| MST-40C | 40 | 17 | 56 | 8.5 | 14 | M5 | 4 | 130.46 | CAD | Cart | ||
| MST-50C | 50 | 21 | 71 | 10.5 | 18 | M6 | 8 | 166.42 | CAD | Cart | ||
| MST-63C | 63 | 26 | 90 | 13 | 24 | M8 | 16 | 437.60 | CAD | Cart |
| Part Number | Max. Bore Diameter (mm) |
Rated Torque＊1 (N・m) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| MST-12C | 5 | 0.4 | 52000 | 7.8×10-8 | 45 | 0.1 | 2 | ±0.3 | 3.6 |
| MST-16C | 6 | 0.5 | 39000 | 3.4×10-7 | 80 | 0.1 | 2 | ±0.4 | 9.2 |
| MST-20C | 8 | 1 | 31000 | 9.1×10-7 | 170 | 0.1 | 2 | ±0.4 | 16 |
| MST-25C | 10 | 2 | 25000 | 2.6×10-6 | 380 | 0.15 | 2 | ±0.5 | 28 |
| MST-32C | 14 | 4 | 19000 | 9.7×10-6 | 500 | 0.15 | 2 | ±0.5 | 64 |
| MST-40C | 18 | 8 | 15000 | 3.3×10-5 | 700 | 0.2 | 2 | ±0.5 | 140 |
| MST-50C | 22 | 16 | 12000 | 1.0×10-4 | 1800 | 0.2 | 2 | ±0.5 | 270 |
| MST-63C | 30 | 32 | 10000 | 3.2×10-4 | 3100 | 0.2 | 2 | ±0.5 | 530 |
＊1： Correction of rated torque due to load fluctuation is not required.
The shaft's slip torque may be smaller than the coupling's rated torque depending on the shaft bore. ⇒Slip torque
＊2： These are values with max. bore diameter.| Part Number | Standard Bore Diameter D1･D2 | ||||
|---|---|---|---|---|---|
| MST-12C | 4-4 | 4-5 | 4.5-5 | 5-5 | |
| MST-16C | 4.5-5 | 4.5-6 | 5-5 | 5-6 | 6-6 |
| MST-20C | 5-6 | 5-6.35 | 5-7 | 5-8 | 6-6 |
| 6-6.35 | 6-7 | 6-8 | 6.35-6.35 | 6.35-8 | |
| 8-8 | |||||
| MST-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 | ||||
| MST-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 | ||||
| MST-40C | 8-8 | 8-10 | 10-10 | 12-12 | 12-14 |
| 14-14 | 14-16 | 15-15 | 15-16 | 16-16 | |
| MST-50C | 12-14 | 14-14 | 15-15 | 16-16 | 18-18 |
| MST-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.
● MST-C has variable slit shapes depending on the size. See the Slit Details.
●Bore additional modification is available on request. Please take advantage of our modification services.
●For the shaft insertion amount to the coupling, see Mounting/maintenance. ⇒Mounting and Maintenance
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 |
|---|---|---|---|---|
|
mm
in.
|
mm
in.
|
Cart |
| Applicable Bore Diameter D1D2 |
keyway | Key | |||||||
|---|---|---|---|---|---|---|---|---|---|
| b | t | Nominal Dimension b×h |
|||||||
| Standard Dimension | Allowance (JS9) |
Standard 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 | |||
| 55 | 16 | ±0.0215 | 4.3 | 16×10 | |||||
| Standard Inch Bore Diameter D1D2 |
Keyway | |||
|---|---|---|---|---|
| Wk | T | |||
| Standard Dimension | Allowance | Standard Dimension | Allowance | |
| 1/2 | 1/8 | +0.002 0 |
0.560 | +0.01 0 |
| 9/16 | 1/8 | +0.002 0 |
0.623 | +0.01 0 |
| 5/8 | 3/16 | +0.002 0 |
0.709 | +0.01 0 |
| 11/16 | 3/16 | +0.002 0 |
0.773 | +0.01 0 |
| 3/4 | 3/16 | +0.002 0 |
0.837 | +0.01 0 |
| 13/16 | 3/16 | +0.002 0 |
0.900 | +0.01 0 |
| 7/8 | 3/16 | +0.002 0 |
0.964 | +0.01 0 |
| 15/16 | 1/4 | +0.002 0 |
1.051 | +0.01 0 |
| 1 | 1/4 | +0.002 0 |
1.114 | +0.01 0 |
| 1-1/8 | 1/4 | +0.002 0 |
1.241 | +0.01 0 |
| 1-1/4 | 1/4 | +0.002 0 |
1.367 | +0.01 0 |
| 1-3/8 | 5/16 | +0.002 0 |
1.518 | +0.01 0 |
| 1-1/2 | 3/8 | +0.002 0 |
1.669 | +0.01 0 |
| 1-5/8 | 3/8 | +0.002 0 |
1.796 | +0.01 0 |
| 1-3/4 | 3/8 | +0.002 0 |
1.922 | +0.01 0 |
- Refer to the "Couplicon Bore Diameter Additional Modification Service" for more information.
- BT： Additional modification of bore
- KT： Metric Keyway Modification (JIS Standard)
- KA： Inch Keyway Modification (AGMA Standard)
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
MSTS-KMade of all stainless steel
Set Screws + Key TypeMST-KMSTS-K
MST-KMade of aluminum alloy
Outside diameter φ12 - φ32
Clamping TypeMST-CMSTS-C
MST-C Made of aluminum alloyMSTS-C Made of all stainless steel
Outside diameter φ40 - φ63
Set Screw TypeMSTMSTS
MST Made of aluminum alloyMSTS Made of all stainless steel
Material/Finish
| MST-C | |
|---|---|
| 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.) | - | ◎ |
- Applicable motors
| MST | MSTS | |
|---|---|---|
| Servomotor | ● | ● |
| Stepping Motor | ◎ | ◎ |
| General-purpose Motor | ● | ● |
Application
Transport device / XY stage / Parts feederPrecautions 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 MaintenanceThere 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. Rotation Diameter
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
Selection Based on Shaft Diameter and Rated Torque
The area bounded by the shaft diameter and rated torque indicates the selection size.Slit Details
MST-C
Eccentric Reaction Force
Thrust reaction force
Change in static torsional stiffness due to temperature
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.
