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SFS [S] Type

三木プーリのサーボフレックスSFSモデル SFS-Sタイプ金属板ばねカップリング製品画像（サーボモータ用高精度軸継手・高剛性トルク伝達）

This is a leaf spring coupling made of steel, and it serves as the standard model in the Servoflex coupling series. The SFS model is supplied as a kit of individual components, allowing for flexible installation into equipment. It offers a variety of mounting options, including pilot holes, keyways, and friction-fit connections. The S-type is a single-element design that provides high rigidity.

[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]	Angular deflection [°]	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]
SFS-05S	20	1	±0.6	25,000	16,000	43	0.11×10⁻³	0.30	15,800
SFS-06S	40	1	±0.8	20,000	29,000	45	0.30×10⁻³	0.50	17,610
SFS-08S	80	1	±1.0	17,000	83,000	60	0.87×10⁻³	1.00	20,120
SFS-09S	180	1	±1.2	15,000	170,000	122	1.60×10⁻³	1.40	22,640
SFS-10S	250	1	±1.4	13,000	250,000	160	2.60×10⁻³	2.10	25,160
SFS-12S	450	1	±1.6	11,000	430,000	197	6.50×10⁻³	3.40	34,950
SFS-14S	800	1	±1.8	9,500	780,000	313	9.90×10⁻³	4.90	46,120

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]

三木プーリのサーボフレックスSFSモデル SFS-Sタイプ金属板ばねカップリング寸法図（サーボモータ用高精度軸継手・高剛性トルク伝達）

Unit [mm]

Model	d1・d2			D	N	L	LF	S	F	K	M	CAD File No.
Model	Pilot hole	Min.	Max	D	N	L	LF	S	F	K	M	CAD File No.
SFS-05S	7	8	20	56	32	45	20	5	11	24	4-M5×22	SFS-S1
SFS-06S	7	8	25	68	40	56	25	6	10	30	4-M6×25	SFS-S2
SFS-08S	10	11	35	82	54	66	30	6	11	38	4-M6×29	SFS-S3
SFS-09S	10	11	38	94	58	68	30	8	21	42	4-M8×36	SFS-S4
SFS-10S	15	16	42	104	68	80	35	10	16	48	4-M8×36	SFS-S5
SFS-12S	18	19	50	126	78	91	40	11	23	54	4-M10×45	SFS-S6
SFS-14S	20	22	60	144	88	102	45	12	31	61	4-M12×54	SFS-S7

*The designation for Reamer Bolt M is calculated as: quantity - thread size × nominal length.

The pilot hole is a drill hole. For machined holes, please refer to the standard hole machining specifications.
The size of a Reema Bolt M is calculated as: quantity × thread size × nominal length.

[Standard Hole Diameter]

Model	Standard Hole Diameter d1・d2 [mm]
Model	8	9	10	11	12	14	15	16	17	18	19	20	22	24	25	28	30	32	35	38	40	42	45	48	50	55	56	60
SFS-05S	●	●	●	●	●	●	●	●	●	●	●	●
SFS-06S	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-08S				●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-09S				●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-10S								●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-12S											●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-14S													●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

The hole diameters indicated by the ● symbol are standard hole diameters. For details, please refer to the standard hole machining specifications.

三木プーリのサーボフレックスシリーズSFSモデル Sタイプ金属板ばね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, Old Standard)					Compliant with JIS New Standard H9 JIS B 1301 1996					New JIS Standard JS9 (Compliant with JIS B 1301:1996)
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, H8	Tolerance H9	－	－	Nominal hole diameter	Tolerance H7, H8	Tolerance JS9	－	－
8	8^+0.0220	－	－	2-M4	8H	8^+0.0220	3 ^{+ 0.0250}	9.4^+0.3₀	2-M4	8J	8 ^{+ 0.0220}	3±0.0125	9.4^+0.3₀	2-M4
9	9 ^{+ 0.0220}	－	－	2-M4	9H	9 ^{+ 0.0220}	3 ^{+ 0.0250}	10.4^+0.3₀	2-M4	9J	9 ^{+ 0.0220}	3±0.0125	10.4^+0.3₀	2-M4
10	10 ^{+ 0.0220}	－	－	2-M4	10H	10 ^{+ 0.0220}	3 ^{+ 0.0250}	11.4^+0.3₀	2-M4	10J	10 ^{+ 0.0220}	3±0.0125	11.4^+0.3₀	2-M4
11	11 ^{+ 0.0180}	－	－	2-M4	11H	11 ^{+ 0.0180}	4 ^{+ 0.0300}	12.8^+0.3₀	2-M4	11J	11 ^{+ 0.0180}	4±0.0150	12.8^+0.3₀	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^+0.3₀	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
15	15 ^{+ 0.0180}	5+^0.050+0_.020	17^+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^+0.3₀	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^+0.3₀	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^.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^+0.3₀	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
20	20 ^{+ 0.0210}	5+^0.050+0_.020	22^+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^+0.3₀	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^+0.3₀	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
25	25 ^{+ 0.0210}	7+^0.061+0_.025	28^+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^+0.3₀	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
30	30 ^{+ 0.0210}	7+^0.061+0_.025	33^+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
38	38 ^{+ 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	38J	38 ^{+ 0.0250}	10±0.0180	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	40J	40 ^{+ 0.0250}	12±0.0215	43.3^+0.3₀	2-M8
42	42 ^{+ 0.0250}	12+^0.075+0_.032	45.5^+0.3₀	2-M8	42H	42 ^{+ 0.0250}	12 ^{+ 0.0430}	45.3^+0.3₀	2-M8	42J	42 ^{+ 0.0250}	12±0.0215	45.3^+0.3₀	2-M8
45	45 ^{+ 0.0250}	12+^0.075+0_.032	48.5^+0.3₀	2-M8	45H	45 ^{+ 0.0250}	14 ^{+ 0.0430}	48.8^+0.3₀	2-M10	45J	45 ^{+ 0.0250}	14±0.0215	48.8^+0.3₀	2-M10
48	48 ^{+ 0.0250}	12+^0.075+0_.032	51.5^+0.3₀	2-M8	48H	48 ^{+ 0.0250}	14 ^{+ 0.0430}	51.8^+0.3₀	2-M10	48J	48 ^{+ 0.0250}	14±0.0215	51.8^+0.3₀	2-M10
50	50 ^{+ 0.0250}	12+^0.075+0_.032	53.5^+0.3₀	2-M8	50H	50 ^{+ 0.0250}	14 ^{+ 0.0430}	53.8^+0.3₀	2-M10	50J	50 ^{+ 0.0250}	14±0.0215	53.8^+0.3₀	2-M10
55	55+^0.0300	15+^0.075+0_.032	60⁺0^.3₀	2-M10	55H	55+^0.0300	16 ^{+ 0.0430}	59.3^+0.3₀	2-M10	55J	55 ^{+ 0.0300}	16±0.0215	59.3^+0.3₀	2-M10
56	56+^0.0300	15+^0.075+0_.032	61^+0.3₀	2-M10	56H	56 ^{+ 0.0300}	16 ^{+ 0.0430}	60.3^+0.3₀	2-M10	56J	56 ^{+ 0.0300}	16±0.0215	60.3^+0.3₀	2-M10
60	60 ^{+ 0.0300}	15+^0.075+0_.032	65^+0.3₀	2-M10	60H	60+0^.0300	18 ^{+ 0.0430}	64.4^+0.3₀	2-M10	60J	60 ^{+ 0.0300}	18±0.0215	64.4^+0.3₀	2-M10

The set screw and the keyway will not be 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 keyway 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.

【止めねじの位置】

SFS 端面からの位置表

型式	端面からの位置［mm］
SFS-05	7
SFS-06	9
SFS-08	10
SFS-09	10
SFS-10	12
SFS-12	12
SFS-14	15