SFH [G] Selectable Length Type

For high-output applications, our high-rigidity leaf spring couplings are available in sizes up to a flange outer diameter of 262 mm, with a maximum torque capacity of 8,000 N·m. The high-rigidity elements feature a proprietary hexagonal structure that enables high-precision power transmission for high-output servo motors. The fixed-length type features a flexible design with two sets of elements arranged via a floating shaft.

[Specifications] Wedge-type fastening

SFH-G Specifications

Model	Rated Torque [N·m]	Tolerance			Maximum Rotational Speed [min⁻¹]	Torsional Spring Constant [N·m/rad]	Axial spring constant [N/mm]	Moment of inertia [kg·m²]	Mass [kg]	Price [JPY]
Model	Rated Torque [N·m]	Eccentricity [mm]	Angular offset [°]	Axial length [mm]	Maximum Rotational Speed [min⁻¹]	Torsional Spring Constant [N·m/rad]	Axial spring constant [N/mm]	Moment of inertia [kg·m²]	Mass [kg]	Price [JPY]
SFH-150G	1000	1.4	1 (per side)	±0.8	5900	750,000	122	34.41×10⁻³	12.96	－
SFH-170G	1300	1.6	1 (per side)	±1.0	5100	1,420,000	112	72.09×10⁻³	18.95	－
SFH-190G	2000	2.0	1 (per side)	±1.0	4700	1,700,000	122	98.15×10⁻³	23.14	－
SFH-210G	4,000	2.1	1 (per side)	±1.1	4300	2,340,000	254	137.53×10⁻3	26.61	－

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] Wedge-type fastening

三木プーリのサーボフレックスシリーズSFHモデル Gタイプ（全長指定・くさび締結仕様）金属板ばねカップリングご注文時の型式構成説明図

Unit [mm]

Model	D	L	d1・d2	N1・N2	LF	LS	S	C	K	M	M1	M2
SFH-150G	152	238	38, 40, 42, 45, 48, 50	108	65	70	11	8	94	12-M8×36	6-M8×60	3-M8
SFH-150G	152	238	55, 56, 60, 65, 70	128	65	70	11	8	94	12-M8×36	6-M8×60	3-M8
SFH-170G	178	254	38, 40, 42, 45, 48, 50	108	65	80	14	8	108	12-M10×45	6-M8×60	3-M8
	178	254	55, 56, 60, 65, 70	128	65	80	14	8	108	12-M10×45	6-M8×60	3-M8
	178	254	75・80	148	65	80	14	8	108	12-M10×45	6-M8×60	3-M8
SFH-190G	190	290	38, 40, 42, 45, 48, 50	108	70	100	15	10	116	12-M12×54	6-M10×65	3-M10
	190	290	55, 56, 60, 65, 70	128	70	100	15	10	116	12-M12×54	6-M10×65	3-M10
	190	290	75, 80, 85	148	70	100	15	10	116	12-M12×54	6-M10×65	3-M10
SFH-210G	210	306	38, 40, 42, 45, 48, 50	108	73	110	15	10	124	12-M16×60	6-M10×65	3-M10
	210	306	55, 56, 60, 65, 70	128	73	110	15	10	124	12-M16×60	6-M10×65	3-M10
	210	306	75, 80, 85, 90	148	73	110	15	10	124	12-M16×60	6-M10×65	3-M10

If you require a product that exceeds the LS dimensions listed above, please specify the required LS dimensions [mm]. Additionally, please contact us if the LS dimension is less than those listed above or if LS is 1000 or greater.
The designation for each bolt and tap is calculated as "quantity × thread size × nominal length"; the quantities for the M1 pressure bolts and M2 removal screw holes refer to the number on one side of the flange.

[Standard Hole Diameter Combinations]

Model	Standard Hole Diameter d1・d2 [mm]
Model	38	40	42	45	48	50	55	56	60	65	70	75	80	85	90
SFH-150G	●	●	●	●	●	●	●	●	●	●	●
SFH-170G	1100	1200	1250	●	●	●	●	●	●	●	●	●	●
SFH-190G	1800	1900	●	●	●	●	●	●	●	●	●	●	●	●
SFH-210G	1800	1900	2000	2150	2300	2400	2600	2650	2850	3100	3350	3600	3800	●	●

The hole diameters indicated by the ● symbol and numerical values are standard hole diameters.
Because the hole diameter in the column containing the numerical values is small, the allowable torque is limited by the holding force at the shaft fastening point. The numerical values indicate the allowable torque [N·m].

[Maximum LS Dimension for Vertical Use]

Unit [mm]

Model	LS [mm]
SFH-150G	1100
SFH-170G	800
SFH-190G	900
SFH-210G	2000

If you are considering vertical installation and the LS dimension exceeds the values in the table above, please contact us.

[Specifications] Pilot hole / Key and set screw type

SFH-G Specifications

Model	Rated Torque [N·m]	Tolerance			Maximum Rotational Speed [min−1]	Torsional Spring Constant [N·m/rad]	Axial spring constant [N/mm]	Moment of inertia [kg·m²]	Mass [kg]	Price of pre-drilled product [JPY]
Model	Rated Torque [N·m]	Eccentricity [mm]	Angular offset [°]	Axial [mm]	Maximum Rotational Speed [min−1]	Torsional Spring Constant [N·m/rad]	Axial spring constant [N/mm]	Moment of inertia [kg·m²]	Mass [kg]	Price of pre-drilled product [JPY]
SFH-150G	1000	1.4	1 (per side)	±0.8	5900	750,000	122	21.87×10⁻³	8.72	-
SFH-170G	1,300	1.6	1 (per side)	±1.0	5100	1,420,000	112	51.07×10⁻³	13.94	-
SFH-190G	2000	2	1 (per side)	±1.0	4700	1,700,000	122	81.58×10⁻³	19.51	-
SFH-210G	4,000	2.1	1 (per side)	±1.1	4300	2,340,000	254	125.50×10⁻³	24.26	-
SFH-220G	5000	2.3	1 (per side)	±1.2	4000	2,970,000	224	176.91×10⁻³	30.27	-
SFH-260G	8000	2.9	1 (per side)	±1.4	3,400	5,390,000	306	433.47×10⁻³	53.11	-

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] Pilot hole / Key and set screw type

三木プーリのサーボフレックスシリーズSFHモデル Gタイプ（全長指定仕様）金属板ばねカップリングご注文時の型式構成説明図

Unit [mm]

Model	d1･d2			D	N	L	LF	LS	S	F	K	M	CAD File No.
Model	Pilot hole	Min.	Max	D	N	L	LF	LS	S	F	K	M	CAD File No.
SFH-150G	20	22	70	152	104	182	45	70	11	5	94	12-M8×36	－
SFH-170G	25	28	80	178	118	218	55	80	14	6	108	12-M10×45	－
SFH-190G	30	32	85	190	126	260	65	100	15	10	116	12-M12×54	－
SFH-210G	35	38	90	210	130	290	75	110	15	8	124	12-M16×60	－
SFH-220G	45	48	100	225	144	335	90	115	20	-2	132	12-M16×60	－
SFH-260G	50	55	115	262	166	391	100	145	23	11	150	12-M20×80	－

The pilot hole is a drill hole. For machined holes, please refer to the standard hole machining specifications.
If you require a product with dimensions exceeding the LS dimensions listed above, please specify the required LS dimensions [mm]. Additionally, please contact us if the dimensions are less than those listed above or if LS is 1000 or greater.
The price of a Reema Bolt M is calculated as: quantity × thread size × nominal length.

[Standard Hole Drilling Specifications]

Keyway and Hole Diameter Chart

Compliant with JIS B 1301 1959 (Type 2, Old Standard)					Compliant with New JIS Standard H9 JIS B 1301 1996					Motor Standard: Compliant with JIS C 4210 2001
Nominal Bore 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 Bore Diameter	Tolerance H7	Tolerance E9	－	－	Nominal hole diameter	Tolerance H7	Tolerance H9	－	－	Nominal hole diameter	Tolerance G7, F7	Tolerance H9	－	－
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	－	－	－	－	－
24	24.8+0.0210	7+0.06 1+0.025	27.0+0.30	2-M6	24H	24+0.0210	8+0.0360	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	－	－	－	－	－
28	28.3+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	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	－	－	－	－	－
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	－	－	－	－	－
35	35.3+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	－	－	－	－	－
38	38.3+0.0250	10+0.061+0.025	41.5+0.30	2-M8	38H	38+0.0250	10+0.0360	41.3+0.30	2-M8	38N	38+0.050+0.025	0.03601	41.3+0.30	2-M8
40	40+0.0250	10+0.061+0.025	43.5+0.30	2-M8	40H	40+0.0250	12+0.0430	43.3+0.30	2-M8	－	－	－	－	－
42	42+0.0250	12+0.061+0.025	45.5+0.30	2-M8	42H	42+0.0250	12+0.0430	45.3+0.30	2-M8	42N	42+0.050+0.025	12+0.0430	45.3+0.30	2-M8
45	45.3+0.0250	12+0.061+0.025	48.5+0.30	2-M8	45H	45+0.0250	14+0.0430	48.8+0.30	2-M10	－	－	－	－	－
48	48.8+0.0250	12+0.061+0.025	51.5+0.30	2-M8	48H	48+0.0250	14+0.0430	51.8+0.30	2-M10	48N	48+0.050+0.025	14+0.0430	51.8+0.30	2-M10
50	50+0.0250	12+0.061+0.025	53.5+0.30	2-M8	50H	50+0.0250	14+0.0430	53.8+0.30	2-M10	－	－	－	－	－
55	55+0.0300	15+0.075+0.032	60.0+0.30	2-M10	55H	55+0.0300	16+0.0430	59.3+0.30	2-M10	55N	55+0.060+0.030	16+0.0430	59.3+0.30	2-M10
56	56+0.0300	15+0.075+0.032	61.0+0.30	2-M10	56H	56+0.0300	16+0.0430	60.3+0.30	2-M10	－	－	－	－	－
60	60+0.0300	15+0.075+0.032	65.0+0.30	2-M10	60H	60+0.0300	18+0.0430	64.4+0.30	2-M10	60N	60+0.060+0.030	18+0.0430	64.4+0.30	2-M10
65	65+0.0300	18+0.075+0.032	71.0+0.30	2-M10	65H	65+0.0300	18+0.0430	69.4+0.30	2-M10	65N	65+0.060+0.030	18+0.0430	69.4+0.30	2-M10
70	70+0.0300	18+0.075+0.032	76.0+0.30	2-M10	70H	70+0.0300	20+0.0520	74.9+0.50	2-M10	－	－	－	－	－
75	75+0.0300	20+0.092+0.040	81.0+0.50	2-M10	75H	75+0.0300	20+0.0520	79.9+0.50	2-M10	75N	75+0.060+0.030	20+0.0520	79.9+0.50	2-M10
80	80+0.0300	20+0.092+0.040	86.0+0.50	2-M10	80H	80+0.0300	22+0.0520	85.4+0.50	2-M12	－	－	－	－	－
85	85+0.0350	24+0.092+0.040	93.0+0.50	2-M12	85H	85+0.0350	22+0.0520	90.4+0.50	2-M12	85N	85+0.071+0.035	22+0.0520	90.4+0.50	2-M12
90	90+0.0350	24+0.092+0.040	98.0+0.50	2-M12	90H	90+0.0350	25+0.0520	95.4+0.50	2-M12	－	－	－	－	－
95	95+0.0350	24+0.092+0.040	103.0+0.50	2-M12	95H	95+0.0350	25+0.0520	100.4+0.50	2-M12	95N	95+0.071+0.035	25+0.0520	100.4+0.50	2-M12
100	100+0.0350	28+0.092+0.040	109.0+0.50	2-M12	100H	100+0.0350	28+0.0520	106.4+0.50	2-M12	－	－	－	－	－
115	115+0.0350	32+0.11 2+0.050	125.0+0.50	2-M12	115H	115+0.0350	32+0.0520	122.4+0.50	2-M12	－	－	－	－	－

[Maximum LS Dimension for Vertical Use]

Unit [mm]

Model	LS [mm]
SFH-150G	1100
SFH-170G	800
SFH-190G	900
SFH-210G	2000
SFH-220G	1900
SFH-260G	2500

If you are considering vertical installation and the LS dimension exceeds the values in the table above, please contact us.