Dimension Drawing
Specs/CAD
| Part Number | Max. Bore Diameter (mm) |
Rated Torque＊1 (N・m) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| MFBS-12C | 5 | 0.5 | 52000 | 2.1×10-7 | 100 | 0.1 | 1.5 | -1.2～+0.4 | 9.2 |
| MFBS-16C | 6.35 | 1 | 39000 | 8.1×10-7 | 150 | 0.1 | 1.5 | -1.2～+0.4 | 22 |
| MFBS-20C | 8 | 1.5 | 31000 | 2.3×10-6 | 220 | 0.15 | 2 | -1.8～+0.6 | 38 |
| MFBS-25C | 10 | 2 | 25000 | 6.9×10-6 | 330 | 0.15 | 2 | -1.8～+0.6 | 74 |
| MFBS-32C | 14 | 3 | 19000 | 2.1×10-5 | 490 | 0.2 | 2 | -2.5～+0.8 | 130 |
＊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. MFBMFBSMFB-C
＊2： These are values with max. bore diameter.| Part Number | Standard Bore Diameter D1･D2 | ||||||
|---|---|---|---|---|---|---|---|
| 4 | 5 | 6 | 8 | 10 | 12 | 14 | |
| MFBS-12C | ● | ● | - | - | - | - | - |
| MFBS-16C | - | ● | ● | - | - | - | - |
| MFBS-20C | - | - | ● | ● | - | - | - |
| MFBS-25C | - | - | - | ● | ● | - | - |
| MFBS-32C | - | - | - | ● | ● | ● | ● |
● All products are provided with hex socket head cap screw.
● Tolerance of shaft bore on set screw type is H8.
● Recommended tolerance for shaft diameters is h6 and h7.
● Bore and keyway modifications are 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 type MFBS-C has different slip torque according to the bore diameter. Take care during selection.Unit : N・m
| Part Number | Bore Diameter (mm) | |||||
|---|---|---|---|---|---|---|
| 4 | 5 | 6 | 8 | 10 | 12 | |
| MFBS-12C | 0.4 | 0.6 | ||||
| MFBS-16C | 0.9 | 1.9 | ||||
| MFBS-20C | 1.6 | 1.8 | ||||
| MFBS-25C | 2.2 | 2.9 | ||||
| MFBS-32C | 3 | 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 MFBS-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 Type
MFBAluminum alloy hubMFBMFBSMFB-CMFBS-C
Clamping Type
MFB-CAluminum alloy hubMFBMFBSMFB-CMFBS-C
Material/Finish
| MFBS-C | |
|---|---|
| Hub | SUS303 |
| Bellows | SUS316L |
| Hex Socket Set Screw | SUSXM7 |
| Hex Socket Head Cap Screw | SUSXM7 |
Characteristics
- Applicable motors
| MFB | MFBS | |
|---|---|---|
| Servomotor | ● | ● |
| Stepping Motor | ○ | ○ |
| General-purpose Motor | ● | ● |
- Property
| MFB | MFBS | |
|---|---|---|
| Zero Backlash | ◎ | ◎ |
| Allowable Misalignment | ○ | ○ |
| Corrosion Resistance (All S.S.) | - | ◎ |
- This is a bellows type flexible coupling.
- The bellows allows eccentricity, angular misalignment, and end-play.
- Even if there is misalignment, the constant revolution is performed.
- There are two types of bellows: phosphor bronze type and stainless steel type.
Application
EncoderPrecautions 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 Based on Shaft Diameter and Rated Torque
The area bounded by the shaft diameter and rated torque indicates the selection size.
Selection Example
In case of selected parameters of shaft diameter of φ10 and load torque of 2 N・m, the selected size forMFBMFB-32.Eccentric Reaction Force
Thrust reaction force
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 MFB and MFBS 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.
