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MF Model

三木プーリのバウマンフレックス MFタイプコイルばね・スリットカップリング製品画像（高トルク対応・柔軟軸継手・産業用伝動機器）

This metal coupling utilizes the elasticity of a spring structure and incorporates a metal coil spring. This model offers high flexibility and is capable of accommodating significant misalignments, such as eccentricity and angular misalignment.While retaining the three-layer structure of the coil spring section, this model has been designed for versatility by shaping one side of the hub into a flange.

[Specifications]

Model	Rated Torque [N·m]	Tolerance			Maximum rotational speed [min⁻¹]	Torsional spring constant [N·m/rad]	Moment of Inertia [kg·m²]	Mass [kg]	Price of pre-drilled product [JPY]
Model	Rated Torque [N·m]	Eccentricity [mm]	Angular offset [°]	Axial length [mm]	Maximum rotational speed [min⁻¹]	Torsional spring constant [N·m/rad]	Moment of Inertia [kg·m²]	Mass [kg]	Price of pre-drilled product [JPY]
MF-8K	5	0.3	3	0.8	15,000	286.5	1.66×10⁻⁵	0.1
MF-12K	10	0.4		1	12,000	573	3.32×10⁻⁵	0.16
MF-16K	20	0.6		1.2	9000	1146	9.18×10⁻⁵	0.31
MF-20K	40	0.7		1.6	7000	2292	2.12×10⁻⁴	0.5
MF-25K	90	0.9		2	6000	3438	5.33×10⁻⁴	0.9
MF-30K	150	1.1		2.5	5000	4297.5	1.35×10⁻3	1.7
MF-35K	220	1.2		3.2	4500	6303	2.86×10⁻³	2.8

The maximum rotational speed does not take dynamic balance into account.
The moment of inertia and mass are based on the maximum bore diameter.

[Dimensions]

三木プーリのバウマンフレックス MFタイプコイルばね・スリットカップリング寸法図（高トルク対応・柔軟軸継手・産業用伝動機器）

Unit [mm]

Model	d1			D	L	L1	L2	A	B	C	E	F	G	K	CAD File No.
Model	Pilot hole	Minimum	Max	D	L	L1	L2	A	B	C	E	F	G	K	CAD File No.
MF-8K	3.5	4	8	21	30	11	6	42	30	18	13	19	1.5	3–φ4.8	MF-K1
MF-12K	5.5	6	12	26	40	16.5	6	48	37	22	16.5	24		3–φ4.8	MF-K2
MF-16K		10	16	35	50	22	6.5	58	47	30	22.4	32		4–φ4.8	MF-K3
MF-20K		12	20	45	60	27	7	65	52	35	28	40		4–φ4.8	MF-K4
MF-25K		14	25	55	75	33.5	8.5	75	62	42	35	50		6– φ 5.8	MF-K5
MF-30K		16	30	65	95	40	10	90	74.5	47	40.8	60	2.5	4–φ7.0	MF-K6
MF-35K		20	35	75	115	48	13	100	84	57	46	70	2.5	6– φ 7.0	MF-K7

The pilot hole will be a drill hole.

三木プーリのバウマンフレックス MFモデルコイルばね・スリットカップリングご注文時の型式構成説明図

[Standard Hole Drilling Specifications]

Unit [mm]

Compliant with JIS B 1301 1959 (Type 2)					Compliant with JIS New Standard H9 JIS B 1301 1996					Compliant with JIS New Standard JS9 JIS B 1301 1996					Motor Standard: Compliant with JIS C 4210 2001
Nominal hole diameter	Bore Diameter (d1, d2)	Keyway width (W1, W2)	Keyway depth (T1, T2)	Set screw hole (M)	Nominal hole diameter	Hole diameter (d1, d2)	Keyway width (W1, W2)	Keyway depth (T1, T2)	Set screw hole (M)	Nominal hole diameter	Hole diameter (d1, d2)	Keyway width (W1, W2)	Keyway depth (T1, T2)	Set screw hole (M)	Nominal hole diameter	Hole diameter (d1, d2)	Keyway width (W1, W2)	Keyway depth (T1, T2)	Set screw hole (M)
Nominal hole diameter	Tolerance H7, H8	Tolerance E9	－	－	Nominal hole diameter	Tolerance H7	Tolerance H9	－	－	Nominal hole diameter	Tolerance H7	Tolerance JS9	－	－	Nominal hole diameter	Tolerance G7, F7	Tolerance H9	－	－
4	4+^0.0180	－	－	2-M3	－	－	－	－	－	－	－	－	－	－	－	－	－	－	－
5	5+^0.0180			2-M3
6	6 ^{+ 0.0180}			2-M4
7	7 ^{+ 0.0220}
8	8 ^{+ 0.0220}
9	9 ^{+ 0.0220}
10	10 ^{+ 0.0220}
11	11 ^{+ 0.0180}
12	12 ^{+ 0.0180}	4 ^{+ 0.050} _{+ 0.020}	13.5 ^{+ 0.3}₀		12H	12 ^{+ 0.0180}	4 ^{+ 0.0300}	13.8 ^{+ 0.3}₀	2-M4	12J	12 ^{+ 0.0180}	4±0.0150	13.8 ^{+ 0.3}₀	2-M4
14	14 ^{+ 0.0180}	5 ^{+ 0.050} _{+ 0.020}	16.0 ^{+ 0.3}₀		14H	14 ^{+ 0.0180}	5 ^{+ 0.0300}	16.3 ^{+ 0.3}₀		14J	14 ^{+ 0.0180}	5 ± 0.0150	16.3 ^{+ 0.3}₀		14N	14 ^{+ 0.}₀²⁴ _{+ 0.006}	5 ^{+ 0.0300}	16.3 ^{+ 0.3}₀	2-M4
15	15 ^{+ 0.0180}		17.0 ^{+ 0.3}₀		15H	15 ^{+ 0.0180}		17.3 ^{+ 0.3}₀		15J	15 ^{+ 0.0180}		17.3 ^{+ 0.3}₀		－	－	－	－	－
16	16 ^{+ 0.0180}		18.0 ^{+ 0.3}₀		16H	16 ^{+ 0.0180}		18.3 ^{+ 0.3}₀		16J	16 ^{+ 0.0180}		18.3 ^{+ 0.3}₀
17	17 ^{+ 0.0180}		19.0 ^{+ 0.3}₀		17H	17 ^{+ 0.0180}		19.3 ^{+ 0.3}₀		17J	17 ^{+ 0.0180}		19.3 ^{+ 0.3}₀
18	18 ^{+ 0.0180}		20.0 ^{+ 0.3}₀		18H	18 ^{+ 0.0180}	6 ^{+ 0.0300}	20.8 ^{+ 0.3}₀	2-M5	18J	18 ^{+ 0.0180}	6±0.0150	20.8 ^{+ 0.3}₀	2-M5
19	19 ^{+ 0.0210}		21.0 ^{+ 0.3}₀		19H	19 ^{+ 0.0210}		21.8 ^{+ 0.3}₀		19J	19 ^{+ 0.0210}		21.8 ^{+ 0.3}₀		19N	19 ^{+ 0.}₀²⁸ _{+ 0.007}	6 ^{+ 0.0300}	21.8 ^{+ 0.3}₀	2-M5
20	20 ^{+ 0.0210}		22.0 ^{+ 0.3}₀		20H	20 ^{+ 0.0210}		22.8 ^{+ 0.3}₀		20J	20 ^{+ 0.0210}		22.8 ^{+ 0.3}₀		－	－	－	－	－
22	22 ^{+ 0.0210}	7 ^{+ 0.06 1} _{+ 0.025}	25.0 ^{+ 0.3}₀	2-M6	22H	22 ^{+ 0.0210}		24.8 ^{+ 0.3}₀		22J	22 ^{+ 0.0210}		24.8 ^{+ 0.3}₀		－	－	－	－	－
24	24 ^{+ 0.0210}		27.0 ^{+ 0.3}₀		24H	24 ^{+ 0.0210}	8 ^{+ 0.0360}	27.3 ^{+ 0.3}₀	2-M6	24J	24 ^{+ 0.0210}	8±0.0180	27.3 ^{+ 0.3}₀	2-M6	24N	24 ^{+ 0.}₀²⁸ _{+ 0.007}	8 ^{+ 0.0360}	27.3 ^{+ 0.3}₀	2-M6
25	25 ^{+ 0.0210}		28.0 ^{+ 0.3}₀		25H	25 ^{+ 0.0210}		28.3 ^{+ 0.3}₀		25J	25 ^{+ 0.0210}		28.3 ^{+ 0.3}₀		－	－	－	－	－
28	28 ^{+ 0.0210}		31.0 ^{+ 0.3}₀		28H	28 ^{+ 0.0210}		31.3 ^{+ 0.3}₀		28J	28 ^{+ 0.0210}		31.3 ^{+ 0.3}₀		28N	28 ^{+ 0.}₀²⁸ _{+ 0.007}	8 ^{+ 0.0360}	31.3 ^{+ 0.3}₀	2-M6
30	30 ^{+ 0.0210}		33.0 ^{+ 0.3}₀		30H	30 ^{+ 0.0210}		33.3 ^{+ 0.3}₀		30J	30 ^{+ 0.0210}		33.3 ^{+ 0.3}₀		－	－	－	－	－
32	32 ^{+ 0.0250}	10 ^{+ 0.06 1} _{+ 0.025}	35.5 ^{+ 0.3}₀	2-M8	32H	32 ^{+ 0.0250}	10 ^{+ 0.0360}	35.3 ^{+ 0.3}₀	2-M8	32J	32 ^{+ 0.0250}	10±0.0180	35.3 ^{+ 0.3}₀	2-M8
35	35 ^{+ 0.0250}	10 ^{+ 0.06 1} _{+ 0.025}	38.5 ^{+ 0.3}₀	2-M8	35H	35 ^{+ 0.0250}	10 ^{+ 0.0360}	38.3 ^{+ 0.3}₀	2-M8	35J	35 ^{+ 0.0250}	10±0.0180	38.3 ^{+ 0.3}₀	2-M8

This standard hole drilling specification applies to Baumannflex MM and MF models.
All specifications for diameters of 11 mm or less are identical to those listed in the "Old JIS Standards" column.
The set screws are not located on the same plane.
The set screw is included with the product.
The positional accuracy of keyway machining is checked visually.
Please contact us if you require positional accuracy for the keyways relative to each hub.
For standard dimensions of hole patterns other than those listed here, please refer to the technical data at the end of this document.

[Location of the set screw]

Position Table from End Face

Coupling Size	Distance C from end face [mm]
6	3
8	5
12・14	7
16, 19, 20, 24	10
25, 28, 30, 35	15