This disk-type coupling features a clamping hub made of a lightweight, high-strength aluminum alloy, providing high torsional stiffness and enabling High Dynamic Performance. Additionally, the hub’s outside diameter is designed to match the shaft diameter, which helps reduce the moment of inertia. The DA2 type is a model with High Torsional Stiffness and a double element design.

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-002DA2	0.25	0.03	0.5 (one side)	±0.08	10,000	95	17	C	0.07×10−6	0.004
SFC-005DA2	0.6	0.05	0.5 (one side)	±0.1	10,000	250	70	C	0.37×10−6	0.010
SFC-010DA2	1	0.11	1 (one side)	±0.2	10,000	700	70	C	0.80×10−6	0.015
SFC-020DA2	2	0.15	1 (one side)	±0.33	10,000	1,850	32	C	3.43×10−6	0.035
SFC-025DA2	4	0.16	1 (per side)	±0.38	10,000	2,800	30	C	5.26×10−6	0.040
SFC-030DA2	5	0.18	1 (per side)	±0.4	10,000	4,000	32	A	7.43×10−6	0.054
								B	9.45×10⁻⁶	0.060
								C	11.56×10⁻⁶	0.068
SFC-035DA2	10	0.24	1 (per side)	±0.5	10,000	9,000	56	C	26.93×10−6	0.121
SFC-040DA2	12	0.24	1 (per side)	±0.6	10,000	10,000	40	A	29.98×10−6	0.124
								B	35.82×10⁻⁶	0.131
								C	42.52×10⁻⁶	0.146
SFC-050DA2	25	0.28	1 (per side)	±0.8	10,000	16,000	24	A	98.34×10⁻⁶	0.250
								B	118.9×10⁻⁶	0.268
								C	141.7×10⁻⁶	0.298
SFC-055DA2	40	0.31	1 (per side)	±0.84	10,000	25,000	21.5	C	261.3×10−6	0.459
SFC-060DA2	60	0.34	1 (per side)	±0.9	10,000	35,000	38.2	A	256.6×10⁻⁶	0.447
								B	315.7×10⁻⁶	0.489
								C	379.3×10⁻⁶	0.549
SFC-080DA2	100	0.52	1 (per side)	±1.10	10,000	70,000	64	C	1039×10−6	1.037
SFC-090DA2	180	0.52	1 (one side)	±1.30	10,000	50,000	54	C	1798×10−6	1.369
SFC-100DA2	250	0.55	1 (one side)	±1.48	10,000	60,000	55.5	C	2754×10−6	1.739

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 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 measurements taken from the element section.
The moment of inertia and mass are the values corresponding to 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	d2 Max	D	DB	N	L	LF	LP	S	A1	A2	C	d3	K	M	Tightening Torque [N·m]	Type
SFC-002DA2	3	5	3	5	12	12.4	─	15.7	5.9	2.8	0.55	─	3.7	1.9	5.2	5.6	1-M1.6	0.23–0.28	C
SFC-005DA2	3	6	3	6	16	─	─	23.2	7.85	5.5	1	─	4.8	2.5	6.5	6.5	1-M2	0.4–0.5	C
SFC-010DA2	3	8	3	8	19	─	─	25.9	9.15	5.5	1.05	─	5.8(6)	3.15	8.5	8.5	1–M2.5 (M2)	1.0–1.1 (0.4–0.5)	C
SFC-020DA2	4	10	4	11	26	─	─	32.3	10.75	7.5	1.65	─	9.5	3.3	10.6	10.6	1-M2.5	1.0–1.1	C
SFC-025DA2	5	14	5	14	29	─	─	32.8	10.75	7.5	1.9	─	11	3.3	15	14.5	1–M2.5	1.0–1.1	C
SFC-030DA2	5	10	5	10	34	─	21.6	37.8	12.4	8	2.5	8	─	3.75	15	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-035DA2	6	16	6	19	39	─	─	48	15.5	11	3	─	14	4.5	17	17	1-M4	3.4–4.1	C
SFC-040DA2	8	15	8	15	44	─	29.6	48	15.5	11	3	11	─	4.5	20	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-050DA2	8	19	8	19	56	─	38	59.8	20.5	14	2.4	14.5	─	6	26	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-055DA2	10	30	10	30	63	─	─	68.7	24	15.5	2.6	─	23	7.75	31	31	1-M6	14–15	C
SFC-060DA2	11	24	11	24	68	─	46	73.3	25.2	16.5	3.2	17.5	─	7.75	31	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-080DA2	18	35	18	40	82	─	─	98	30	22	8	─	28	9	40	38	1-M8	27–30	C
SFC-090DA2	25	40	25	45	94	─	─	98.6	30	22	8.3	─	34	9	47	42	1-M8	27–30	C
SFC-100DA2	32	45	32	45	104	─	─	101.6	30	22	9.8	─	39	9	50	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 φ8 mm.

Standard Bore Size (Standard)

Standard (Optional) Bore Sizes d1 and d2 [mm] and Permissible Torque [N·m]
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-002DA2	d1	●	●	●
SFC-002DA2	d2	●	●	●
SFC-005DA2	d1	●	●	●	●
SFC-005DA2	d2	●	●	●	●
SFC-010DA2	d1	●	●	●	●	●	●	●
SFC-010DA2	d2	●	●	●	●	●	●	●
SFC-020DA2	d1		●	●	●	●	●	●	●	●	●
SFC-020DA2	d2		●	●	●	●	●	●	●	●	●	●
SFC-025DA2	d1			2.1	●	●	●	●	●	●	●	●	●	●	●
SFC-025DA2	d2			2.1	●	●	●	●	●	●	●	●	●	●	●
SFC-030DA2	d1			2.8	3.4	●	●	●	●	●	●	●	●	●	●
SFC-030DA2	d2			2.8	3.4	●	●	●	●	●	●	●	●	●	●	●	●
SFC-035DA2	d1				5	5	6.6	●	●	●	●	●	●	●	●	●	●
SFC-035DA2	d2				5	5	6.6	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-040DA2	d1							9	●	●	●	●	●	●	●	●	●	●	●	●
SFC-040DA2	d2							9	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050DA2	d1							18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050DA2	d2							18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-055DA2	d1										31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
SFC-055DA2	d2										31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
SFC-060DA2	d1											50	51	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-060DA2	d2											50	51	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-080DA2	d1																		●	●	●	●	●	●	●	●	●	●
SFC-080DA2	d2																		●	●	●	●	●	●	●	●	●	●	●	●
SFC-090DA2	d1																							●	●	●	●	●	●	●
SFC-090DA2	d2																							●	●	●	●	●	●	●	●	●
SFC-100DA2	d1																										226	●	●	●	●	●
SFC-100DA2	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 is +0.010 to -0.025.
For shaft tolerances j6 and k6: The nominal sizes for J and K 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 due to the small bore size. 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-□DA2(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-040DA2-□B-11BC	B	12	0.24	1 (one side)	±0.6	10,000	10,000	40	39.42×10−6	0.180
SFC-040DA2-□B-11BC	C	12	0.24	1 (one side)	±0.6	10,000	10,000	40	46.12×10⁻⁶	0.195
SFC-050DA2-□B-11BC	B	25	0.28	1 (one side)	±0.8	10,000	16,000	24	125.5 × 10⁻⁶	0.331
SFC-050DA2-□B-11BC	C	25	0.28	1 (one side)	±0.8	10,000	16,000	24	146.1×10⁻⁶	0.349
SFC-050DA2-□B-14BC	B	25	0.28	1 (per side)	±0.8	10,000	16,000	24	131.1 × 10⁻⁶	0.362
SFC-050DA2-□B-14BC	C	25	0.28	1 (per side)	±0.8	10,000	16,000	24	154.1×10⁻⁶	0.392
SFC-050DA2-□B-16BC	B	25	0.28	1 (per side)	±0.8	10,000	16,000	24	138.1 × 10⁻⁶	0.400
SFC-050DA2-□B-16BC	C	25	0.28	1 (per side)	±0.8	10,000	16,000	24	160.8×10⁻⁶	0.430
SFC-055DA2-□B-14BC	C	40	0.31	1 (one side)	±0.84	10,000	25,000	21.5	274.0 × 10⁻⁶	0.530
SFC-055DA2-□B-16BC	C	40	0.31	1 (one side)	±0.84	10,000	25,000	21.5	280.5 × 10⁻⁶	0.567
SFC-060DA2-□B-16BC	B	60	0.34	1 (one side)	±0.9	10,000	35,000	38.2	339.4 × 10⁻⁶	0.638
SFC-060DA2-□B-16BC	C	60	0.34	1 (one side)	±0.9	10,000	35,000	38.2	398.5×10⁻⁶	0.681

The TYPE (B/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 measurements taken of the element section.
The moment of inertia and mass are the values corresponding to the maximum bore size.

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-040DA2-□B-11BC	11	4	12.2	18	16	17	22	58	44	48	15.5	4.5	11	17	1-M4
SFC-050DA2-□B-11BC	11	4	12.2	18	16	17	22	64.8	56	59.8	20.5	6	14.5	22	1-M5
SFC-050DA2-□B-14BC	14	4	15.1	24	19	22	28	69.8	56	59.8	20.5	6	14.5	22	1-M5
SFC-050DA2-□B-16BC	16	5	17.3	24	29	26	30	79.8	56	59.8	20.5	6	14.5	22	1-M5
SFC-055DA2-□B-14BC	14	4	15.1	24	19	22	28	74.4	63	68.7	24	7.75	―	23	1-M6
SFC-055DA2-□B-16BC	16	5	17.3	24	29	26	30	84.7	63	68.7	24	7.75	―	23	1-M6
SFC-060DA2-□B-16BC	16	5	17.3	24	29	26	30	89.3	68	73.3	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-040DA2-□B-11BC	9	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050DA2-□B-11BC	18/20/22/22					●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050DA2-□B-14BC	18/20/22/22					●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-050DA2-□B-16BC	18/20/22/22					●	●	●	●	●	●	●	●	●	●	●	●	●
SFC-055DA2-□B-14BC	31/34/36/38							●	●	●	●	●	●	●	●	●	●	●	●
SFC-055DA2-□B-16BC	31/34/36/38							●	●	●	●	●	●	●	●	●	●	●	●
SFC-060DA2-□B-16BC	50/51							●	●	●	●	●	●	●	●	●	●	●	●	●	●

The standard bore size for shaft tolerance h7 (h6·g6) is nominal B.
For shaft tolerances j6 and k6: The J and K designations 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, we may be able to accommodate them on a case-by-case basis, so Contact Us.
For holes with numerical values, the permissible (operating) torque is limited by the Holding Power at the shaft fastening section due to the small bore size. The numerical values indicate the permissible 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, 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 for more information.