SFC [SA2] Type | Miki Pulley

This leaf spring-type coupling features a clamp hub made of lightweight, high-strength aluminum alloy, offering high torsional rigidity and excellent responsiveness. Additionally, the hub’s outer diameter is designed to match the shaft diameter, helping to reduce the moment of inertia. The SA2 type is a single-element, high-rigidity model.

[Specifications]

SFC-SA2 Specifications

Model	Rated Torque [N·m]	Tolerance			Maximum Rotational Speed [min⁻¹]	Torsional spring constant [N·m/rad]	Axial spring constant [N/mm]	Type	Moment of Inertia [kg·m²]	Mass [kg]	Price [JPY]
Model	Rated Torque [N·m]	Eccentricity [mm]	Angular Deviation [°]	Axial length [mm]	Maximum Rotational Speed [min⁻¹]	Torsional spring constant [N·m/rad]	Axial spring constant [N/mm]	Type	Moment of Inertia [kg·m²]	Mass [kg]	Price [JPY]
SFC-002SA2	0.25	0.01	0.5	±0.04	10,000	190	34	C	0.06×10⁻6	0.003
SFC-005SA2	0.6	0.02	0.5	±0.05	10,000	500	140	C	0.26×10⁻6	0.007
SFC-010SA2	1	0.02	1	±0.1	10,000	1400	140	°C	0.58×10⁻⁶	0.011
SFC-020SA2	2	0.02	1	±0.15	10,000	3,700	64	°C	2.39×10⁻⁶	0.025
SFC-025SA2	4	0.02	1	±0.19	10,000	5,600	60	°C	3.67×10⁻6	0.029
SFC-030SA2	5	0.02	1	±0.2	10,000	8,000	64	A	4.07×10⁻⁶	0.034
	5	0.02	1	±0.2	10,000	8,000	64	B	6.09×10⁻⁶	0.041
	5	0.02	1	±0.2	10,000	8,000	64	C	8.20×10⁻⁶	0.049
SFC-035SA2	10	0.02	1	±0.25	10,000	18,000	112	°C	18.44×10⁻⁶	0.082
SFC-040SA2	12	0.02	1	±0.3	10,000	20,000	80	A	16.71×10⁻⁶	0.077
	12	0.02	1	±0.3	10,000	20,000	80	B	22.55×10⁻⁶	0.085
	12	0.02	1	±0.3	10,000	20,000	80	°C	29.25×10⁻⁶	0.100
SFC-050SA2	25	0.02	1	±0.4	10,000	32,000	48	A	55.71×10⁻⁶	0.159
	25	0.02	1	±0.4	10,000	32,000	48	B	76.26×10⁻6	0.177
	25	0.02	1	±0.4	10,000	32,000	48	°C	99.03×10⁻⁶	0.206
SFC-055SA2	40	0.02	1	±0.42	10,000	50,000	43	°C	188.0×10⁻⁶	0.314
SFC-060SA2	60	0.02	1	±0.45	10,000	70,000	76.4	A	145.9×10⁻⁶	0.283
	60	0.02	1	±0.45	10,000	70,000	76.4	B	205.0×10⁻⁶	0.326
	60	0.02	1	±0.45	10,000	70,000	76.4	°C	268.6×10⁻6	0.385
SFC-080SA2	100	0.02	1	±0.55	10,000	140,000	128	°C	710.6×10⁻6	0.708
SFC-090SA2	180	0.02	1	±0.65	10,000	100,000	108	C	1236×10⁻6	0.946
SFC-100SA2	250	0.02	1	±0.74	10,000	120,000	111	C	1.891×10^⁽⁻⁶⁾	1.202

The shape type (A, B, or C) is automatically determined based on the combination of hole diameters you select, so you cannot specify it.
The allowable torque may be limited by the holding force of the shaft fastening section, so please verify it using the standard bore diameter.
The maximum rotational speed does not take dynamic balance into account.
The torsional spring constant values are based solely on measurements taken of the element section.
The moment of inertia and mass are based on the maximum bore diameter.

[Dimensions]

SFC-SA2 寸法表

単位［mm］

型式	d1 最小	d1 最大	d2 最小	d2 最大	D	DB	N	L	LF	S	A1	A2	C	K	M	締め付けトルク［N･m］	形状TYPE
SFC-002SA2	3	5	3	5	12	12.4	─	12.35	5.9	0.55	─	3.7	1.9	5.6	1-M1.6	0.23～0.28	C
SFC-005SA2	3	6	3	6	16	─	─	16.7	7.85	1	─	4.8	2.5	6.5	1-M2	0.4～0.5	C
SFC-010SA2	3	8	3	8	19	─	─	19.35	9.15	1.05	─	5.8(6)	3.15	8.5	1-M2.5(M2)	1.0～1.1(0.4～0.5)	C
SFC-020SA2	4	10	4	11	26	─	─	23.15	10.75	1.65	─	9.5	3.3	10.6	1-M2.5	1.0～1.1	C
SFC-025SA2	5	14	5	14	29	─	─	23.4	10.75	1.9	─	11	3.3	14.5	1-M2.5	1.0～1.1	C
SFC-030SA2	5	10	5	10	34	─	21.6	27.3	12.4	2.5	8	─	3.75	14.5	1-M3	1.5～1.9	A
	5	10	10を超え	16	34	─	21.6	27.3	12.4	2.5	8	12.5	3.75	14.5	1-M3	1.5～1.9	B
	10を超え	14	10を超え	16	34	─	21.6	27.3	12.4	2.5	─	12.5	3.75	14.5	1-M3	1.5～1.9	C
SFC-035SA2	6	16	6	19	39	─	─	34	15.5	3	─	14	4.5	17	1-M4	3.4～4.1	C
SFC-040SA2	8	15	8	15	44	─	29.6	34	15.5	3	11	─	4.5	19.5	1-M4	3.4～4.1	A
	8	15	15を超え	24	44	─	29.6	34	15.5	3	11	17	4.5	19.5	1-M4	3.4～4.1	B
	15を超え	19	15を超え	24	44	─	29.6	34	15.5	3	─	17	4.5	19.5	1-M4	3.4～4.1	C
SFC-050SA2	8	19	8	19	56	─	38	43.4	20.5	2.4	14.5	─	6	26	1-M5	7.0～8.5	A
	8	19	19を超え	30	56	─	38	43.4	20.5	2.4	14.5	22	6	26	1-M5	7.0～8.5	B
	19を超え	25	19を超え	30	56	─	38	43.4	20.5	2.4	─	22	6	26	1-M5	7.0～8.5	C
SFC-055SA2	10	30	10	30	63	─	─	50.6	24	2.6	─	23	7.75	31	1-M6	14～15	C
SFC-060SA2	11	24	11	24	68	─	46	53.6	25.2	3.2	17.5	─	7.75	31	1-M6	14～15	A
	11	24	24を超え	35	68	─	46	53.6	25.2	3.2	17.5	26.5	7.75	31	1-M6	14～15	B
	24を超え	30	24を超え	35	68	─	46	53.6	25.2	3.2	─	26.5	7.75	31	1-M6	14～15	C
SFC-080SA2	18	35	18	40	82	─	─	68	30	8	─	28	9	38	1-M8	27～30	C
SFC-090SA2	25	40	25	45	94	─	─	68.3	30	8.3	─	34	9	42	1-M8	27～30	C
SFC-100SA2	32	45	32	45	104	─	─	69.8	30	9.8	─	39	9	48	1-M8	27～30	C

形状 TYPE（A・B・C）はご採用いただく穴径の組み合わせにより自動的に決定いたしますのでご指示いただくことはできません。
φDB寸法は、ハブ外径よりもクランプボルトの頭が出ている場合の寸法です。
クランプボルトＭの呼びは数量-ねじの呼びで、数量は片側ハブの数量です。
SFC-010の( )内の数値は、d1またはd2がφ8mmの場合の値となります。

[Standard Hole Diameter]

SFC-SA2 Standard Bore Diameter Table

Standard (Optional) Bore Diameters d1 and d2 [mm] and Maximum Torque [N·m]
Nominal Bore Diameter		3	4	5	6	6.35	7	8	9	9.525	10	11	12	13	14	15	16	17	18	19	20	22	24	25	28	30	32	35	38	40	42	45
Shaft tolerance: h7 (h6, g6)	B	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
Shaft tolerance: j6 (optional)	J																			○		○	○		○
Shaft tolerance: k6 (optional)	K							○	○						○		○			○		○	○				○		○
SFC-002SA2	d1	●	●	●
SFC-002SA2	d2	●	●	●
SFC-005SA2	d1	●	●	●	●
SFC-005SA2	d2	●	●	●	●
SFC-010SA2	d1	●	●	●	●	●	●	●
SFC-010SA2	d2	●	●	●	●	●	●	●
SFC-020SA2	d1		●	●	●	●	●	●	●	●	●
SFC-020SA2	d2		●	●	●	●	●	●	●	●	●	●
SFC-025SA2	d1			2.1	●	●	●	●	●	●	●	●	●	●	●
SFC-025SA2	d2			2.1	●	●	●	●	●	●	●	●	●	●	●
SFC-030SA2	d1			2.8	3.4	●	●	●	●	●	●	●	●	●	●
SFC-030SA2	d2			2.8	3.4	●	●	●	●	●	●	●	●	●	●	●	●
SFC-035SA2	d1				5	5	6.6	●	●	●	●	●	●	●	●	●	●
SFC-035SA2	d2				5	5	6.6	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-040SA2	d1							9	●	●	●	●	●	●	●	●	●	●	●	●
SFC-040SA2	d2							9	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050SA2	d1							18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050SA2	d2							18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-055SA2	d1										31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
SFC-055SA2	d2										31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
SFC-060SA2	d1											50	51	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-060SA2	d2											50	51	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-080SA2	d1																		●	●	●	●	●	●	●	●	●	●
SFC-080SA2	d2																		●	●	●	●	●	●	●	●	●	●	●	●
SFC-090SA2	d1																							●	●	●	●	●	●	●
SFC-090SA2	d2																							●	●	●	●	●	●	●	●	●
SFC-100SA2	d1																										226	●	●	●	●	●
SFC-100SA2	d2																										226	●	●	●	●	●

The standard bore diameter for shaft tolerance h7 (h6/g6) is designation B. However, for a bore diameter of φ35, the shaft tolerance is +0.010 to -0.025.
For shaft tolerances j6 and k6: The J and K designations are optional; only the hole diameters marked with a circle are supported.
The hole diameters indicated by the ● symbol and numerical values in the corresponding columns are standard sizes. For hole diameters not listed in the table above, we may be able to accommodate special requests, so please contact us.
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].

For Tapered Shafts: SFC-□SA2(BC)

By attaching a tapered adapter to the tapered shaft of the servo motor, it can be secured using a clamping hub.

[Specifications]

SFC-SA2 Specifications

Model	Type	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	Type	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 [JPY]
SFC-040SA2-□B-11BC	B	12	0.02	1	±0.3	10,000	20,000	80	26.58×10⁻⁶	0.131	-
SFC-040SA2-□B-11BC	C	12	0.02	1	±0.3	10,000	20,000	80	33.28×10⁻⁶	0.146	-
SFC-050SA2-□B-11BC	B	25	0.02	1	±0.4	10,000	32,000	48	82.91×10⁻⁶	0.24	-
SFC-050SA2-□B-11BC	C	25	0.02	1	±0.4	10,000	32,000	48	103.5×10⁻⁶	0.258	-
SFC-050SA2-□B-14BC	B	25	0.02	1	±0.4	10,000	32,000	48	88.72×10⁻⁶	0.271	-
SFC-050SA2-□B-14BC	C	25	0.02	1	±0.4	10,000	32,000	48	111.5×10⁻⁶	0.301	-
SFC-050SA2-□B-16BC	B	25	0.02	1	±0.4	10,000	32,000	48	95.44×10^{^(−6)}	0.309	-
SFC-050SA2-□B-16BC	C	25	0.02	1	±0.4	10,000	32,000	48	118.2×10⁻⁶	0.338	-
SFC-055SA2-□B-14BC	C	40	0.02	1	±0.42	10,000	50,000	43	201.1×10^⁽⁻⁶⁾	0.409	-
SFC-055SA2-□B-16BC	C	40	0.02	1	±0.42	10,000	50,000	43	207.8×10⁻⁶	0.446	-
SFC-060SA2-□B-16BC	B	60	0.02	1	±0.45	10,000	70,000	76.4	228.7×10⁻⁶	0.475	-
SFC-060SA2-□B-16BC	C	60	0.02	1	±0.45	10,000	70,000	76.4	287.8×10⁻⁶	0.517	-

The TYPE (B or C) is automatically determined based on the combination of hole diameters you select, so you cannot specify it.
The allowable torque may be limited by the holding force of the shaft fastening section, so please check the standard bore diameter.
The maximum rotational speed does not take dynamic balance into account.
The torsional spring constant values are based solely on measurements taken of the element section.
The moment of inertia and mass are based on the maximum bore diameter.

[Dimensions]

SFC-SA2 Dimension Chart

Unit [mm]

Model	d2	W	T	WA	LA	dA	DA	LL	D	L	LF	C	A1	A2	M
Model	d2	W	T	WA	LA	dA	DA	LL	D	L	LF	C	A1	A2	Quantity-Nominal
SFC-040SA2-□B-11BC	11	4	12.2	18	16	17	22	44	44	34	15.5	4.5	11	17	1-M4
SFC-050SA2-□B-11BC	11	4	12.2	18	16	17	22	48.4	56	43.4	20.5	6	14.5	22	1-M5
SFC-050SA2-□B-14BC	14	4	15.1	24	19	22	28	53.4	56	43.4	20.5	6	14.5	22	1-M5
SFC-050SA2-□B-16BC	16	5	17.3	24	29	26	30	63.4	56	43.4	20.5	6	14.5	22	1-M5
SFC-055SA2-□B-14BC	14	4	15.1	24	19	22	28	56.6	63	50.6	24	7.75	―	23	1-M6
SFC-055SA2-□B-16BC	16	5	17.3	24	29	26	30	66.6	63	50.6	24	7.75	―	23	1-M6
SFC-060SA2-□B-16BC	16	5	17.3	24	29	26	30	69.6	68	53.6	25.2	7.75	17.5	26.5	1-M6

For dimensions other than those listed above, please refer to the dimensions for the Single Element Type SFC (SA2).

[Standard Hole Diameter]

SFC-SA2 Bore Diameter Chart

Standard (Optional) Hole Diameter d1 [mm] and Maximum Torque [N·m]
Nominal Hole Diameter		8	9	9.525	10	11	12	13	14	15	16	17	18	19	20	22	24	25	28	30	32	35
Shaft tolerance h7 (h6, g6)	B	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
Shaft tolerance j6 (optional)	J												○		○	○		○
Shaft tolerance k6 (optional)	K	○	○					○		○			○		○	○				○
SFC-040SA2-□B-11BC	9	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050SA2-□B-11BC	18/20/22/22					●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050SA2-□B-14BC	18/20/22/22					●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050SA2-□B-16BC	18/20/22/22					●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-055SA2-□B-14BC	31/34/36/38							●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-055SA2-□B-16BC	31/34/36/38							●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-060SA2-□B-16BC	50/51							●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

The standard bore diameter for shaft tolerance h7 (h6/g6) is nominal B.
For shaft tolerances j6 and k6: The J and K designations are optional; only the hole diameters marked with a circle are supported.
The hole diameters indicated by the ● symbol and numerical values in the corresponding columns are standard sizes. For hole diameters not listed in the table above, please contact us, as we may be able to accommodate special requests.
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].

Keyway machining supported

If you choose to use a keyed shaft, we can machine a keyway into the clamping hub upon request.

[Dimensions] SFC (SA2/DA2)

Keyway Standard Conversion Chart

Unit [mm]

Keyway Width H9 Standard Compatibility														Keyway Width: JS9 Standard
Nominal Shaft Diameter				Bore Diameter d1･d2 [mm]	Keyway width W1, W2 [mm]	Keyway height T1, T2 [mm]	Nominal Shaft Diameter				Bore diameter d1, d2 [mm]	Keyway width W1, W2 [mm]	Keyway depth T1 and T2 [mm]	Nominal shaft diameter				Bore diameter d1, d2 [mm]	Keyway width W1, W2 [mm]	Keyway depth T1 and T2 [mm]	Nominal shaft diameter				Bore diameter d1, d2 [mm]	Keyway width W1, W2 [mm]	Keyway depth T1 and T2 [mm]
Shaft diameter	Shaft tolerance						Shaft diameter	Shaft tolerance						Shaft diameter	Shaft tolerance						Shaft diameter	Shaft tolerance
Shaft diameter	h7	j6	k6				Shaft diameter	h7	j6	k6				Shaft diameter	h7	j6	k6				Shaft diameter	h7	j6	k6
8	BH	－	KH	8	3 + 0.0250	9.4 + 0.30	20	BH	－	－	20	6 + 0.0300	22.8 + 0.30	8	BJ	－	KJ	8	3±0.0125	9.4 + 0.30	20	BJ	－	－	20	6±0.0150	22.8 + 0.30
9	BH	－	KH	9	3 + 0.0250	10.4 + 0.30	22	BH	JH	KH	22	6 + 0.0300	24.8 + 0.30	9	BJ	－	KJ	9	3±0.0125	10.4 + 0.30	22	BJ	JJ	KJ	22	6±0.0150	24.8 + 0.30
10	BH	－	－	10	3 + 0.0250	11.4 + 0.30	24	BH	JH	KH	24	8 + 0.0360	27.3 + 0.30	10	BJ	－	－	10	3±0.0125	11.4 + 0.30	24	BJ	JJ	KJ	24	8 ± 0.0180	27.3 + 0.30
11	BH	－	－	11	4 + 0.0300	12.8 + 0.30	25	BH	－	－	25	8 + 0.0360	28.3 + 0.30	11	BJ	－	－	11	4±0.0150	12.8 + 0.30	25	BJ	－	－	25	8±0.0180	28.3 + 0.30
12	BH	－	－	12	4 + 0.0300	13.8 + 0.30	28	BH	JH	－	28	8 + 0.0360	31.3 + 0.30	12	BJ	－	－	12	4±0.0150	13.8 + 0.30	28	BJ	JJ	－	28	8±0.0180	31.3 + 0.30
13	BH	－	－	13	5 + 0.0300	15.3 + 0.30	30	BH	－	－	30	8 + 0.0360	33.3 + 0.30	13	BJ	－	－	13	5±0.0150	15.3 + 0.30	30	BJ	－	－	30	8±0.0180	33.3 + 0.30
14	BH	－	KH	14	5 + 0.0300	16.3 + 0.30	32	BH	－	KH	32	10 + 0.0360	35.3 + 0.30	14	BJ	－	KJ	14	5±0.0150	16.3 + 0.30	32	BJ	－	KJ	32	10±0.0180	35.3 + 0.30
15	BH	－	－	15	5 + 0.0300	17.3 + 0.30	35	BH	－	－	35	10 + 0.0360	38.3 + 0.30	15	BJ	－	－	15	5±0.0150	17.3 + 0.30	35	BJ	－	－	35	10±0.0180	38.3 + 0.30
16	BH	－	KH	16	5 + 0.0300	18.3 + 0.30	38	BH	－	KH	38	10 + 0.0360	41.3 + 0.30	16	BJ	－	KJ	16	5±0.0150	18.3 + 0.30	38	BJ	－	KJ	38	10±0.0180	41.3 + 0.30
17	BH	－	－	17	5 + 0.0300	19.3 + 0.30	40	BH	－	－	40	12 + 0.0430	43.3 + 0.30	17	BJ	－	－	17	5±0.0150	19.3 + 0.30	40	BJ	－	－	40	12±0.0215	43.3 + 0.30
18	BH	－	－	18	6 + 0.0300	20.8 + 0.30	42	BH	－	－	42	12 + 0.0430	45.3 + 0.30	18	BJ	－	－	18	6±0.0150	20.8 + 0.30	42	BJ	－	－	42	12±0.0215	45.3 + 0.30
19	BH	－	KH	19	6 + 0.0300	21.8 + 0.30	45	BH	－	－	45	14 + 0.0430	48.8 + 0.30	19	BJ	JJ	KJ	19	6±0.0150	21.8 + 0.30	45	BJ	－	－	45	14±0.0215	48.8 + 0.30

We can accommodate specifications not listed in the table above. Please contact us.