Product Selection Navigator

SFS [W] Type

三木プーリのサーボフレックスSFSモデル SFS-Wタイプ金属板ばねカップリング製品画像（高剛性・高精度位置決め・サーボモータ用軸継手）

This leaf spring coupling features a steel body and serves as the standard model in the Servoflex coupling series. The SFS model is supplied as a kit, allowing for flexible installation into equipment. It offers a variety of mounting options, including pilot holes, keyways, and friction-fit connections, while the W-type features a flexible double-element design.

[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]
SFS-05W	20	0.2	1 (per side)	±1.2	10,000	8,000	21	0.14×10⁻³	0.40	28,510
SFS-06W	40	0.3	1 (per side)	±1.6	8000	14,000	22	0.41×10⁻³	0.70	31,720
SFS-08W	80	0.3	1 (per side)	±2.0	6800	41,000	30	1.10×10⁻³	1.30	36,330
SFS-09W	180	0.5	1 (per side)	±2.4	6000	85,000	61	2.20×10⁻³	2.10	40,810
SFS-10W	250	0.5	1 (per side)	±2.8	5200	125,000	80	3.60×10⁻³	2.80	45,280
SFS-12W	450	0.6	1 (per side)	±3.2	4400	215,000	98	9.20×10⁻³	4.90	62,900
SFS-14W	800	0.7	1 (per side)	±3.6	3800	390,000	156	15.00×10⁻³	7.10	83,020

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-Wタイプ金属板ばねカップリング寸法図（高剛性・高精度位置決め・サーボモータ用軸継手）

Unit [mm]

Model	d1・d2			D	N	L	LF	LP	S	F	d3	K	M
Model	Pilot hole	Minimum	Max	D	N	L	LF	LP	S	F	d3	K	M
SFS-05W	7	8	20	56	32	58	20	8	5	4	20	24	8-M5×15
SFS-06W	7	8	25	68	40	74	25	12	6	3	24	30	8-M6×18
SFS-08W	10	11	35	82	54	84	30	12	6	2	28	38	8-M6×20
SFS-09W	10	11	38	94	58	98	30	22	8	12	32	42	8-M8×27
SFS-10W	15	16	42	104	68	110	35	20	10	7	34	48	8-M8×27
SFS-12W	18	19	50	126	78	127	40	25	11	10	40	54	8-M10×32
SFS-14W	20	22	60	144	88	144	45	30	12	15	46	61	8-M12×38

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-05W	●	●	●	●	●	●	●	●	●	●	●	●
SFS-06W	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-08W				●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-09W				●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-10W								●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-12W											●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFS-14W													●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

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Wタイプ金属板ばねカップリング寸法図外形寸法および主要部寸法を示す寸法図

[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 sizes 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