This leaf spring-type coupling features a clamping hub made of a lightweight, high-strength aluminum alloy, offering high torsional stiffness and excellent High Dynamic Performance. Furthermore, the hub’s outside diameter is designed to match the Shaft diameter, which helps reduce the moment of inertia. The SA2 type is a single-element, High Torsional Stiffness model.

Specifications (Standard)

models	Permissible (operating) torque [N·m]	Permissible Tolerance			Max. rotation speed [^min⁻¹]	Torsional stiffness [N·m/rad]	Axial stiffness [N/mm]	Type	Moment of Inertia [kg·m²]	Mass [kg]
models	Permissible (operating) torque [N·m]	Eccentricity [mm]	Angular Misalignment [°]	In the axial direction [mm]	Max. rotation speed [^min⁻¹]	Torsional stiffness [N·m/rad]	Axial stiffness [N/mm]	Type	Moment of Inertia [kg·m²]	Mass [kg]
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	1,400	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
								B	6.09×10⁻⁶	0.041
								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
								B	22.55×10⁻⁶	0.085
								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
								B	76.26×10⁻⁶	0.177
								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
								B	205.0 × 10⁻⁶	0.326
								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	1891 × 10⁻⁶	1.202

The shape TYPE (A, B, or C) is automatically determined based on the combination of bore sizes you select, so you cannot specify it.
The permissible (operating) torque may be limited by the holding power of the shaft fastening section, so please verify it using the standard bore size.
The max. rotation speed does not take dynamic balance into account.
The torsional stiffness values are based solely on actual measurements of the element section.
The moment of inertia and mass are the values at the maximum bore size.

Dimensions (Standard)

三木プーリのサーボフレックスシリーズSFCモデルSA2タイプ金属板ばねカップリング寸法図取付寸法および軸径寸法を示す寸法図

Unit [mm]
models	d1 (Min.)	d1 Max	Min. d2	Maximum d2	D	DB	N	L	LF	S	A1	A2	C	K	M	Tightening Torque [N·m]	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	Over 10	16							8	12.5					B
	Over 10	14	Over 10	16							─	12.5					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	Greater than 15	24							11	17					B
	Over 15	19	Over 15	24							─	17					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	Greater than 19	30							14.5	22					B
	Over 19	25	Over 19	30							─	22					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	Over 24	35							17.5	26.5					B
	Over 24	30	Over 24	35							─	26.5					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

The shape TYPE (A, B, or C) is automatically determined based on the combination of bore sizes you select, so you cannot specify it.
The φDB dimension is the measurement taken when the head of the clamping bolt protrudes beyond the outside diameter of the hub.
The nominal size for Clamping Bolt M is the quantity followed by the thread size; the quantity refers to the number of hubs on one side.
The numbers in parentheses for SFC-010 are the values when d1 or d2 is 8 mm in diameter.

Standard Bore Size (Standard)

Standard (Optional) Bore Sizes d1 and d2 [mm] and the Permissible (Operating) Torque [N·m] Subject to These Limitations
Nominal Bore Size		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 size for shaft tolerance h7 (h6·g6) is designation B. However, for a bore size of φ35, the shaft tolerance ranges from +0.010 to -0.025.
For shaft tolerances j6 and k6: The J and K designations are optional; only the circle-marked bore sizes are supported.
The bore sizes indicated by the ● symbol and numerical values in the corresponding columns are standard bore sizes. For bore sizes not listed in the table above, we may be able to accommodate them on a case-by-case basis, so Contact Us for more information.
For holes with numerical values, the permissible (operating) torque is limited by the Holding Power at the shaft fastening section because the bore size is small. The numerical values indicate the permissible torque [N·m].

三木プーリのサーボフレックスシリーズSFCモデル SA2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

Taper Shaft Compatible: SFC-□SA2(BC)

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

Specifications (Tapered Shaft)

models	Shape TYPE	Permissible (operating) torque [N·m]	Permissible Tolerance			Max. rotation speed [^min⁻¹]	Torsional stiffness [N·m/rad]	Axial stiffness [N/mm]	Moment of inertia [kg·m²]	Mass [kg]
models	Shape TYPE	Permissible (operating) torque [N·m]	Eccentricity [mm]	Angular Misalignment [°]	In the axial direction [mm]	Max. rotation speed [^min⁻¹]	Torsional stiffness [N·m/rad]	Axial stiffness [N/mm]	Moment of inertia [kg·m²]	Mass [kg]
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/C) is automatically determined based on the combination of bore sizes you select; therefore, you cannot specify it.
The permissible torque may be limited by the holding power of the shaft fastening section; please verify this using the standard bore size.
The max. rotation speed does not take dynamic balance into account.
The torsional stiffness values are based solely on measurements taken from the element section.
The moment of inertia and mass are the values at the maximum bore diameter.

Dimensions (Tapered Shaft)

Unit [mm]
models	d2	W	T	WA	LA	dA	DA	LL	D	L	LF	C	A1	A2	M
models	d2	W	T	WA	LA	dA	DA	LL	D	L	LF	C	A1	A2	Quantity-nominal size
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 Version SFC (SA2).

Standard Bore Size (Tapered Shaft)

Standard (Optional) Bore Size d1 [mm] and Permissible (Operating) Torque [N·m]
Nominal Bore Size		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 size for shaft tolerance h7 (h6·g6) is nominal B.
For shaft tolerances j6 and k6: The nominal sizes for J and K are optional and apply only to the bore sizes marked with a circle (○).
The bore sizes indicated by the ● symbol and numerical values in the corresponding columns are standard bore sizes. For bore sizes not listed in the table above, special arrangements may be required; Contact Us for more information.
For holes with values listed, the permissible (operating) torque is limited by the Holding Power at the shaft locking section due to the small bore size. The values indicate the permissible (operating) torque [N·m].

Keyway Machining Supported

If you choose to use a shaft with a key, we can perform Keyway Machining on the clamping hub upon request.

Dimensions (SFC SA2/DA2)

Unit [mm]
Keyway width compliant with H9 standard														Keyway width compliant with JS9 standard
Nominal Shaft Diameter				Bore size d1 and d2 [mm]	Keyway width W1 and W2 [mm]	Keyway height T1, T2 [mm]	Nominal Shaft Diameter				Bore size d1, d2 [mm]	Keyway width W1 and W2 [mm]	Keyway height T1 and T2 [mm]	Nominal Shaft Diameter				Bore Size d1, d2 [mm]	Keyway width W1 and W2 [mm]	Keyway height T1 and T2 [mm]	Nominal Shaft Diameter				Bore size d1, d2 [mm]	Keyway width W1 and W2 [mm]	Keyway height 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. Contact Us.