MF Models

By using flange construction for the hub on one side of a BAUMANN FLEX MM model, which uses a three-layer construction for the metal coil spring component to enable high torque transmission in a compact form factor, a wider range of needs can be satisfied.Like the the MM-K type of BAUMANN FLEX, SUM24L-equivalent material is used as the hub material and piano wire for the coil spring.

MF Models

[Specifications]

Model Rated Torque [N・m] Misalignment Max. rotation speed [min-1 Torsional stiffness [N・m/rad] Moment of inertia [kg・m2 Mass [kg]
Parallel [mm] Angular [°] Axial [mm]
MF-8K 5 0.3 3 +0.8 15000 286.5 1.66×10-5 0.1
MF-12K 10 0.4 3 +1.0 12000 573 3.32×10-5 0.16
MF-16K 20 0.6 3 +1.2 9000 1146 9.18×10-5 0.31
MF-20K 40 0.7 3 +1.6 7000 2292 2.12×10-4 0.5
MF-25K 90 0.9 3 +2.0 6000 3438 5.33×10-4 0.9
MF-30K 150 1.1 3 +2.5 5000 4297.5 1.35×10-3 1.7
MF-35K 220 1.2 3 +3.2 4500 6303 2.86×10-3 2.8
*Max. rotation speed does not take into account dynamic balance. *The moment of Inertia and mass are measured for the maximum bore diameter.

[Dimensions]

Unit [mm]
Model d1 D L L1 L2 A B C E F G K
Pilot bore Min. Max.
MF-8K 3.5 4 8 21 30 11 6 42 30 18 13 19 1.5 3- φ 4.8
MF-12K 5.5 6 12 26 40 16.5 6 48 37 22 16.5 24 1.5 3- φ 4.8
MF-16K 5.5 10 16 35 50 22 6.5 58 47 30 22.4 32 1.5 4- φ 4.8
MF-20K 5.5 12 20 45 60 27 7 65 52 35 28 40 1.5 4- φ 4.8
MF-25K 5.5 14 25 55 75 33.5 8.5 75 62 42 35 50 1.5 6- φ 5.8
MF-30K 5.5 16 30 65 95 40 10 90 74.5 47 40.8 60 2.5 4- φ 7.0
MF-35K 5.5 20 35 75 115 48 13 100 84 57 46 70 2.5 6- φ 7.0
*Pilot bores are to be drilled into the part.

[Standard Hole-drilling Standards]

Unit [mm]
Models compliant with the old JIS standard (class 2) JIS B 1301 1959 Models compliant with the new JIS standard (H9) JIS B 1301 1996 Models compliant with the new JIS standard (JS9) JIS B 1301 1996 Models compliant with the motor standard JIS C 4210 2001
Nominal bore diameter Bore diameter [d1・d2] Keyway width [W1・W2] Keyway height [T1・T2] Set screw hole [M] Nominal bore diameter Bore diameter [d1・d2] Keyway width [W1・W2] Keyway height [T1・T2] Set screw hole [M] Nominal bore diameter Bore diameter [d1・d2] Keyway width [W1・W2] Keyway height [T1・T2] Set screw hole [M] Nominal bore diameter Bore diameter [d1・d2] Keyway width [W1・W2] Keyway height [T1・T2] Set screw hole [M]
Tolerance H7,H8 Tolerance E9 Tolerance H7 Tolerance H9 Tolerance H7 Tolerance JS9 Tolerance G7,F7 Tolerance H9
4 4+0.0180 2-M3
5 5+0.0180 2-M3
6 6+0.0180 2-M4
6.35 6.35+0.0220 2-M4
7 7+0.0220 2-M4
8 8+0.0220 2-M4
9 9+0.0220 2-M4
9.5 9.5+0.0220 2-M4
9.525 9.525+0.0220 2-M4
10 10+0.0220 2-M4
11 11+0.0180 2-M4
12 12+0.0180 4+0.050+0.020 13.5+0.30 2-M4 12H 12+0.0180 4+0.0300 13.8+0.30 2-M4 12J 12+0.0180 4±0.0150 13.8+0.30 2-M4
14 14+0.0180 5+0.050+0.020 16.0+0.30 2-M4 14H 14+0.0180 5+0.0300 16.3+0.30 2-M4 14J 14+0.0180 5±0.0150 16.3+0.30 2-M4 14N 14+0.024+0.006 5+0.0300 16.3+0.30 2-M4
15 15+0.0180 5+0.050+0.020 17.0+0.30 2-M4 15H 15+0.0180 5+0.0300 17.3+0.30 2-M4 15J 15+0.0180 5±0.0150 17.3+0.30 2-M4
16 16+0.0180 5+0.050+0.020 18.0+0.30 2-M4 16H 16+0.0180 5+0.0300 18.3+0.30 2-M4 16J 16+0.0180 5±0.0150 18.3+0.30 2-M4
17 17+0.0180 5+0.050+0.020 19.0+0.30 2-M4 17H 17+0.0180 5+0.0300 19.3+0.30 2-M4 17J 17+0.0180 5±0.0150 19.3+0.30 2-M4
18 18+0.0180 5+0.050+0.020 20.0+0.30 2-M4 18H 18+0.0180 6+0.0300 20.8+0.30 2-M5 18J 18+0.0180 6±0.0150 20.8+0.30 2-M5
19 19+0.0210 5+0.050+0.020 21.0+0.30 2-M4 19H 19+0.0210 6+0.0300 21.8+0.30 2-M5 19J 19+0.0210 6±0.0150 21.8+0.30 2-M5 19N 19+0.028+0.007 6+0.0300 21.8+0.30 2-M5
20 20+0.0210 5+0.050+0.020 22.0+0.30 2-M4 20H 20+0.0210 6+0.0300 22.8+0.30 2-M5 20J 20+0.0210 6±0.0150 22.8+0.30 2-M5
22 22+0.0210 7+0.061+0.025 25.0+0.30 2-M6 22H 22+0.0210 6+0.0300 24.8+0.30 2-M5 22J 22+0.0210 6±0.0150 24.8+0.30 2-M5
24 24+0.0210 7+0.061+0.025 27.0+0.30 2-M6 24H 24+0.0210 8+0.0360 27.3+0.30 2-M6 24J 24+0.0210 8±0.0180 27.3+0.30 2-M6 24N 24+0.028+0.007 8+0.0360 27.3+0.30 2-M6
25 25+0.0210 7+0.061+0.025 28.0+0.30 2-M6 25H 25+0.0210 8+0.0360 28.3+0.30 2-M6 25J 25+0.0210 8±0.0180 28.3+0.30 2-M6
28 28+0.0210 7+0.061+0.025 31.0+0.30 2-M6 28H 28+0.0210 8+0.0360 31.3+0.30 2-M6 28J 28+0.0210 8±0.0180 31.3+0.30 2-M6 28N 28+0.028+0.007 8+0.0360 31.3+0.30 2-M6
30 30+0.0210 7+0.061+0.025 33.0+0.30 2-M6 30H 30+0.0210 8+0.0360 33.3+0.30 2-M6 30J 30+0.0210 8±0.0180 33.3+0.30 2-M6
32 32+0.0250 10+0.061+0.025 35.5+0.30 2-M8 32H 32+0.0250 10+0.0360 35.3+0.30 2-M8 32J 32+0.0250 10±0.0180 35.3+0.30 2-M8
35 35+0.0250 10+0.061+0.025 38.5+0.30 2-M8 35H 35+0.0250 10+0.0360 38.3+0.30 2-M8 35J 35+0.0250 10±0.0180 38.3+0.30 2-M8
* These standard bore drilling standards apply to BAUMANNFLEX MM/MF models. * All standards starting from ø11 are the same as those in the old JIS standards column. * Positions of set screws and keyways are not on the same plane. * Set screws are included with the product. * Positioning precision for keyway milling is determined by sight. * Contact Miki Pulley when the keyway requires a positioning precision for a particular flange hub. * Consult the technical documentation at the end of this volume for standard dimensions for bore drilling other than those given here.