SFC Models

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Features of SFC Models

These are disc-spring couplings that use a lightweight, high-strength aluminum alloy for the clamp hub to enable high torsional stiffness and high response. Both single-element types with high torsional stiffness and flexible double-element types that separate double elements with a spacer are available. Both lower the moment of inertia by linking the outer diameter of the hub to the shaft diameter.

Ultra-low inertia

The outer diameter shape of the clamp hub is linked to the bore diameter you are using. This decreases inertia to the lowest amount necessary by reducing the outer diameter when the bore diameter is small, making these optimal for fast-accelerating operation. Three shapes are available to match the combination of bore diameters you are using.

Simple, reliable, no backlash

Since the clamp method is used to couple to the shaft, mounting can be completed by tightening one bolt each on left and right. Clamp hubs enable reliable connections that are strong against vibration and shocks, and all power is transmitted by frictional couplings, so there is no backlash. The clamp hubs on both sides of the coupling are centered using a dedicated tool, ensuring concentricity.

Blocks heat

A stainless steel disc spring is used for the element, so heat from the servo motor does not readily transfer to the driven shaft, reducing inconsistency in precision caused by thermal expansion.

For tapered shafts

Allows coupling via a clamp hub when an optional taper adapter is mounted on the tapered shaft of a servo motor.

Custom-ordered specific lengths （SFC DA2 types）

This type allows you to specify a specific length that matches the distance between shafts that you require.

SFC(SA2) Types

[Specifications]

Model	Type	Rated torque [N･m]	Misalignment			Max. rotation speed [min^-1]	Torsional stiffness [N･m/rad]	Axial stiffness [N/mm]	Moment of inertia [kg･m2]	Mass[kg]
Model	Type	Rated torque [N･m]	Parallel［mm］	Angular［゜］	Axial［mm］	Max. rotation speed [min^-1]	Torsional stiffness [N･m/rad]	Axial stiffness [N/mm]	Moment of inertia [kg･m2]	Mass[kg]
SFC-002SA2	C	0.25	0.01	0.5	±0.04	10000	190	34	0.06×10^-6	0.003
SFC-005SA2	C	0.6	0.02	0.5	±0.05	10000	500	140	0.26×10^-6	0.007
SFC-010SA2	C	1	0.02	1	±0.1	10000	1400	140	0.58×10^-6	0.011
SFC-020SA2	C	2	0.02	1	±0.15	10000	3700	64	2.39×10^-6	0.025
SFC-025SA2	C	4	0.02	1	±0.19	10000	5600	60	3.67×10^-6	0.029
SFC-030SA2	A	5	0.02	1	±0.2	10000	8000	64	4.07×10^-6	0.034
	B								6.09×10^-6	0.041
	C								8.20×10^-6	0.049
SFC-035SA2	C	10	0.02	1	±0.25	10000	18000	112	18.44×10^-6	0.082
SFC-040SA2	A	12	0.02	1	±0.3	10000	20000	80	16.71×10^-6	0.077
	B								22.55×10^-6	0.085
	C								29.25×10^-6	0.100
SFC-050SA2	A	25	0.02	1	±0.4	10000	32000	48	55.71×10^-6	0.159
	B								76.26×10^-6	0.177
	C								99.03×10^-6	0.206
SFC-055SA2	C	40	0.02	1	±0.42	10000	50000	43	188.0×10^-6	0.314
SFC-060SA2	A	60	0.02	1	±0.45	10000	70000	76.4	145.9×10^-6	0.283
	B								205.0×10^-6	0.326
	C								268.6×10^-6	0.385
SFC-080SA2	C	100	0.02	1	±0.55	10000	140000	128	710.6×10^-6	0.708
SFC-090SA2	C	180	0.02	1	±0.65	10000	100000	108	1236×10^-6	0.946
SFC-100SA2	C	250	0.02	1	±0.74	10000	120000	111	1891×10^-6	1.202

* Types A / B / C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer.

* Check the Standard Bore Diameter list as rated torque may be restricted by the holding power of the shaft connection component.

* Max. rotation speed does not take into account dynamic balance.

* Torsional stiffness values given are measured values for the element alone.

* The moment of inertia and mass are measured for the maximum bore diameter.

[Dimensions]

Unit [mm]

Model	Type	d1[mm]		d2[mm]		D[mm]	DB[mm]	N[mm]	Ｌ[mm]	LF[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	K[mm]	M Qty - Nominal dia	Tightening torque[N･m]
Model	Type	Min.	Max.	Min.	Max.	D[mm]	DB[mm]	N[mm]	Ｌ[mm]	LF[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	K[mm]	M Qty - Nominal dia	Tightening torque[N･m]
SFC-002SA2	Ｃ	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
SFC-005SA2	C	3	6	3	6	16	─	─	16.7	7.85	1	─	4.8	2.5	6.5	1-M2	0.4～0.5
SFC-010SA2	C	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)
SFC-020SA2	C	4	10	4	11	26	─	─	23.15	10.75	1.65	─	9.5	3.3	10.6	1-M2.5	1.0～1.1
SFC-025SA2	C	5	14	5	14	29	─	─	23.4	10.75	1.9	─	11	3.3	14.5	1-M2.5	1.0～1.1
SFC-030SA2	A	5	10	5	10	34	─	21.6	27.3	12.4	2.5	8	─	3.75	14.5	1-M3	1.5～1.9
	B	5	10	Over 10	16			21.6				8	12.5
	C	Over 10	14	Over 10	16			─				─	12.5
SFC-035SA2	C	6	16	6	19	39	─	─	34	15.5	3	─	14	4.5	17	1-M4	3.4～4.1
SFC-040SA2	A	8	15	8	15	44	─	29.6	34	15.5	3	11	─	4.5	19.5	1-M4	3.4～4.1
	B	8	15	Over 15	24			29.6				11	17
	C	Over 15	19	Over 15	24			─				─	17
SFC-050SA2	A	8	19	8	19	56	─	38	43.4	20.5	2.4	14.5	─	6	26	1-M5	7.0～8.5
	B	8	19	Over 19	30			38				14.5	22
	C	Over 19	25	Over 19	30			─				─	22
SFC-055SA2	C	10	30	10	30	63	─	─	50.6	24	2.6	─	23	7.75	31	1-M6	14～15
SFC-060SA2	A	11	24	11	24	68	─	46	53.6	25.2	3.2	17.5	─	7.75	31	1-M6	14～15
	B	11	24	Over 24	35			46				17.5	26.5
	C	Over 24	30	Over 24	35			─				─	26.5
SFC-080SA2	C	18	35	18	40	82	─	─	68	30	8	─	28	9	38	1-M8	27～30
SFC-090SA2	C	25	40	25	45	94	─	─	68.3	30	8.3	─	34	9	42	1-M8	27～30
SFC-100SA2	C	32	45	32	45	104	─	─	69.8	30	9.8	─	39	9	48	1-M8	27～30

* Types A / B / C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer.

* The øDB value is measured assuming that the head of the clamping bolt is larger than the external diameter of the hub.

* The K dimension is the inner diameter of the element. For d2 dimension exceeding this value, shaft can be inserted only up to LF dimension to the d2 side hub.

* The nominal diameter for the clamping bolt M is equal to the quantity minus the nominal diameter of the screw threads, where the quantity is for a hub on one side.

* The figures in parentheses ( ) for the SFC-010 are the values when d1 or d2 is ø8 mm.

[Standard bore diameter]

Standard (option) bore diameter, d1/d2 [mm] and restricted rated 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	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J																			○		○	○		○
	k6(Option)	K							○	○						○		○			○		○	○				○		○
Supported bore diameter for each mode	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 shaft tolerance for standard bore diameter is h7 (h6 or g6): designation B. However, for a bore diameter of ø35, the shaft tolerance is － 0.025 to ＋0.010.

* Shaft tolerances j6/k6: designations J/K are optional, and are only supported for bore diameters marked with ○ .

* Bore diameters marked with ● or numbers are supported as the standard bore diameters. Consult Miki Pulley regarding special arrangements which may be possible for other bore diameters.

* Bore diameters whose fields contain numbers are restricted in their rated torque by the holding power of the shaft connection component because the bore diameter is small. The numbers indicate the rated torque [N•m].

SFC(DA2) Types

[Specifications]

Model	Type	Rated torque [N･m]	Misalignment			Max. rotation speed [min^-1]	Torsional stiffness [N･m/rad]	Axial stiffness [N/mm]	Moment of inertia [kg･m2]	Mass[kg]
Model	Type	Rated torque [N･m]	Parallel［mm］	Angular［゜］	Axial［mm］	Max. rotation speed [min^-1]	Torsional stiffness [N･m/rad]	Axial stiffness [N/mm]	Moment of inertia [kg･m2]	Mass[kg]
SFC-002DA2	C	0.25	0.03	0.5(On one side)	±0.08	10000	95	17	0.07×10^-6	0.004
SFC-005DA2	C	0.6	0.05	0.5(On one side)	±0.1	10000	250	70	0.37×10^-6	0.010
SFC-010DA2	C	1	0.11	1(On one side)	±0.2	10000	700	70	0.80×10^-6	0.015
SFC-020DA2	C	2	0.15	1(On one side)	±0.33	10000	1850	32	3.43×10^-6	0.035
SFC-025DA2	C	4	0.16	1(On one side)	±0.38	10000	2800	30	5.26×10^-6	0.040
SFC-030DA2	A	5	0.18	1(On one side)	±0.4	10000	4000	32	7.43×10^-6	0.054
	B								9.45×10^-6	0.060
	C								11.56×10^-6	0.068
SFC-035DA2	C	10	0.24	1(On one side)	±0.5	10000	9000	56	26.93×10^-6	0.121
SFC-040DA2	A	12	0.24	1(On one side)	±0.6	10000	10000	40	29.98×10^-6	0.124
	B								35.82×10^-6	0.131
	C								42.52×10^-6	0.146
SFC-050DA2	A	25	0.28	1(On one side)	±0.8	10000	16000	24	98.34×10^-6	0.250
	B								118.9×10^-6	0.268
	C								141.7×10^-6	0.298
SFC-055DA2	C	40	0.31	1(On one side)	±0.84	10000	25000	21.5	261.3×10^-6	0.459
SFC-060DA2	A	60	0.34	1(On one side)	±0.9	10000	35000	38.2	256.6×10^-6	0.447
	B								315.7×10^-6	0.489
	C								379.3×10^-6	0.549
SFC-080DA2	C	100	0.52	1(On one side)	±1.10	10000	70000	64	1039×10^-6	1.037
SFC-090DA2	C	180	0.52	1(On one side)	±1.30	10000	50000	54	1798×10^-6	1.369
SFC-100DA2	C	250	0.55	1(On one side)	±1.48	10000	60000	55.5	2754×10^-6	1.739

* Types A / B / C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer.

* Check the "Standard Bore Diameters" as rated torque may be restricted by the holding power of the shaft connection component.

* Max. rotation speed does not take into account dynamic balance.

* Torsional stiffness values given are measured values for the element alone

* The moment of inertia and mass are measured for the maximum bore diameter.

[Dimensions]

Unit [mm]

Model	Type	d1[mm]		d2[mm]		D[mm]	DB[mm]	N[mm]	Ｌ[mm]	LF[mm]	LP[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	d3[mm]	K[mm]	M Qty - Nominal dia	Tightening torque[N･m]
Model	Type	Min.	Max.	Min.	Max.	D[mm]	DB[mm]	N[mm]	Ｌ[mm]	LF[mm]	LP[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	d3[mm]	K[mm]	M Qty - Nominal dia	Tightening torque[N･m]
SFC-002DA2	C	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
SFC-005DA2	C	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
SFC-010DA2	C	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)
SFC-020DA2	C	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
SFC-025DA2	C	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
SFC-030DA2	A	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
	B	5	10	Over 10	16			21.6					8	12.5
	C	Over 10	14	Over 10	16			─					─	12.5
SFC-035DA2	C	6	16	6	19	39	─	─	48	15.5	11	3	─	14	4.5	17	17	1-M4	3.4～4.1
SFC-040DA2	A	8	15	8	15	44	─	29.6	48	15.5	11	3	11	─	4.5	20	19.5	1-M4	3.4～4.1
	B	8	15	Over 15	24			29.6					11	17
	C	Over 15	19	Over 15	24			─					─	17
SFC-050DA2	A	8	19	8	19	56	─	38	59.8	20.5	14	2.4	14.5	─	6	26	26	1-M5	7.0～8.5
	B	8	19	Over 19	30			38					14.5	22
	C	Over 19	25	Over 19	30			─					─	22
SFC-055DA2	C	10	30	10	30	63	─	─	68.7	24	15.5	2.6	─	23	7.75	31	31	1-M6	14～15
SFC-060DA2	A	11	24	11	24	68	─	46	73.3	25.2	16.5	3.2	17.5	─	7.75	31	31	1-M6	14～15
	B	11	24	Over 24	35			46					17.5	26.5
	C	Over 24	30	Over 24	35			─					─	26.5
SFC-080DA2	C	18	35	18	40	82	─	─	98	30	22	8	─	28	9	40	38	1-M8	27～30
SFC-090DA2	C	25	40	25	45	94	─	─	98.6	30	22	8.3	─	34	9	47	42	1-M8	27～30
SFC-100DA2	C	32	45	32	45	104	─	─	101.6	30	22	9.8	─	39	9	50	48	1-M8	27～30

* Types A / B / C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer.

* The øDB value is measured assuming that the head of the clamping bolt is larger than the external diameter of the hub.

* The K dimension is the inner diameter of the element. For d2 dimension exceeding this value, shaft can be inserted only up to LF dimension to the d2 side hub.

* The nominal diameter for the clamping bolt M is equal to the quantity minus the nominal diameter of the screw threads, where the quantity is for a hub on one side.

* The figures in parentheses ( ) for the SFC-010 are the values when d1 or d2 is ø8 mm.

[Standard bore diameter]

Standard (option) bore diameter, d1/d2 [mm] and restricted rated 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	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J																			○		○	○		○
	k6(Option)	K							○	○						○		○			○		○	○				○		○
Supported bore diameter for each mode	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 shaft tolerance for standard bore diameter is h7 (h6 or g6): designation B. However, for a bore diameter of ø35, the shaft tolerance is －0.025 to ＋0.010.

* Shaft tolerances j6/k6: designations J/K are optional, and are only supported for bore diameters marked with ○ .

* Bore diameters marked with ● or numbers are supported as the standard bore diameters. Consult Miki Pulley regarding special arrangements which may be possible for other bore diameters.

Options of SFC Models

Tapered shaft supported
- • SFC (SA2)
  Specifications
  
  Dimensions
- • SFC (DA2)
  Specifications
  
  Dimensions
For length-specifi ed special order parts
- • SFC (DA2)
  Specifications
  
  Dimensions
For keyway milling applications
- • SFC (SA2/DA2)
  Dimensions
  
  Standard Bore Diameter

Tapered shaft supported Allows coupling clamping hub when a taper adapter is mounted on the tapered shaft of a servo motor.

SFC (SA2)

Specifications

Model	Rated torque ［N·m]	Misalignment			Max. rotation speed ［min^-1]	Torsional stiffness ［N·m/rad]	Axial stiffness ［N/mm]	Type	Moment of inertia［kg·m²]	Mass ［kg]
Model	Rated torque ［N·m]	Parallel ［mm]	Angular ［°]	Axial ［mm]	Max. rotation speed ［min^-1]	Torsional stiffness ［N·m/rad]	Axial stiffness ［N/mm]	Type	Moment of inertia［kg·m²]	Mass ［kg]
SFC-040SA2-□B-11BC	12	0.02	1	±0.3	10000	20000	80	B	26.58×10^-6	0.131
SFC-040SA2-□B-11BC	12	0.02	1	±0.3	10000	20000	80	C	33.28×10^-6	0.146
SFC-050SA2-□B-11BC	25	0.02	1	±0.4	10000	32000	48	B	82.91×10^-6	0.240
SFC-050SA2-□B-11BC	25	0.02	1	±0.4	10000	32000	48	C	103.5×10^-6	0.258
SFC-050SA2-□B-14BC	25	0.02	1	±0.4	10000	32000	48	B	88.72×10^-6	0.271
SFC-050SA2-□B-14BC	25	0.02	1	±0.4	10000	32000	48	C	111.5×10^-6	0.301
SFC-050SA2-□B-16BC	25	0.02	1	±0.4	10000	32000	48	B	95.44×10^-6	0.309
SFC-050SA2-□B-16BC	25	0.02	1	±0.4	10000	32000	48	C	118.2×10^-6	0.338
SFC-055SA2-□B-14BC	40	0.02	1	±0.42	10000	50000	43	C	201.1×10^-6	0.409
SFC-055SA2-□B-16BC	40	0.02	1	±0.42	10000	50000	43	C	207.8×10^-6	0.446
SFC-060SA2-□B-16BC	60	0.02	1	±0.45	10000	70000	76.4	B	228.7×10^-6	0.475
SFC-060SA2-□B-16BC	60	0.02	1	±0.45	10000	70000	76.4	C	287.8×10^-6	0.517

* Types B / C are automatically specified by Miki Pulley according to the bore diameter you select, and cannot be specified by the customer.

* Check the "Standard Bore Diameters" as rated torque may be restricted by the holding power of the shaft connection component.

* Max. rotation speed does not take into account dynamic balance.

* Torsional stiffness values given are measured values for the element alone.

* The moment of inertia and mass are measured for the maximum bore diameter.

Dimensions

Unit [mm]

Model	d2	W	T	WA	LA	dA	DA	LL	D	L	LF	C	A1	A2	M
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 other dimensions, see dimensions for single element type SFC(SA2).

SFC (DA2)

Specifications

Model	Rated torque ［N·m]	Misalignment			Max. rotation speed ［min^-1]	Torsional stiffness ［N·m/rad]	Axial stiffness ［N/mm]	Type	Moment of inertia［kg·m²]	Mass ［kg]
Model	Rated torque ［N·m]	Parallel ［mm]	Angular ［°]	Axial ［mm]	Max. rotation speed ［min^-1]	Torsional stiffness ［N·m/rad]	Axial stiffness ［N/mm]	Type	Moment of inertia［kg·m²]	Mass ［kg]
SFC-040DA2-□B-11BC	12	0.24	1(On one side)	±0.6	10000	10000	40	B	39.42×10^-6	0.180
SFC-040DA2-□B-11BC	12	0.24	1(On one side)	±0.6	10000	10000	40	C	46.12×10^-6	0.195
SFC-050DA2-□B-11BC	25	0.28	1 (On one side)	±0.8	10000	16000	24	B	125.5×10^-6	0.331
SFC-050DA2-□B-11BC	25	0.28	1 (On one side)	±0.8	10000	16000	24	C	146.1×10^-6	0.349
SFC-050DA2-□B-14BC	25	0.28	1 (On one side)	±0.8	10000	16000	24	B	131.1×10^-6	0.362
SFC-050DA2-□B-14BC	25	0.28	1 (On one side)	±0.8	10000	16000	24	C	154.1×10^-6	0.392
SFC-050DA2-□B-16BC	25	0.28	1 (On one side)	±0.8	10000	16000	24	B	138.1×10^-6	0.400
SFC-050DA2-□B-16BC	25	0.28	1 (On one side)	±0.8	10000	16000	24	C	160.8×10^-6	0.430
SFC-055DA2-□B-14BC	40	0.31	1 (On one side)	±0.84	10000	25000	21.5	C	274.0×10^-6	0.530
SFC-055DA2-□B-16BC	40	0.31	1 (On one side)	±0.84	10000	25000	21.5	C	280.5×10^-6	0.567
SFC-060DA2-□B-16BC	60	0.34	1 (On one side)	±0.9	10000	35000	38.2	B	339.4×10^-6	0.638
SFC-060DA2-□B-16BC	60	0.34	1 (On one side)	±0.9	10000	35000	38.2	C	398.5×10^-6	0.681

* Types B / C are automatically specified by Miki Pulley according to the bore diameter you select, and cannot be specified by the customer.

* Check the "Standard Bore Diameters" as rated torque may be restricted by the holding power of the shaft connection component.

* Max. rotation speed does not take into account dynamic balance.

* Torsional stiffness values given are measured values for the element alone.

* The moment of inertia and mass are measured for the maximum bore diameter.

Dimensions

Unit [mm]

Model	d2	W	T	WA	LA	dA	DA	LL	D	L	LF	C	A1	A2	M
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 other dimensions, see dimensions for double element type SFC(DA2).

Tapered shaft supported
- • SFC (SA2)
  Specifications
  
  Dimensions
- • SFC (DA2)
  Specifications
  
  Dimensions
For length-specifi ed special order parts
- • SFC (DA2)
  Specifications
  
  Dimensions
For keyway milling applications
- • SFC (SA2/DA2)
  Dimensions
  
  Standard Bore Diameter

For length-specifi ed special order parts SFC (DA2) couplings can be made in specific lengths that match the distance between shafts by changing the length of the spacer. Specify the length in 1 mm units.

SFC (DA2)

Specifications

Model	Rated torque ［N·m]	Misalignment				Max. rotation speed ［min^-1]	Type	Moment of inertia［kg·m²]		Mass ［kg]
		Parallel ［mm] Min. L	Parallel ［mm] Max. L	Angular ［°]	Axial ［mm]			Moment of inertia［kg·m²]		Mass ［kg]
		Parallel ［mm] Min. L	Parallel ［mm] Max. L	Angular ［°]	Axial ［mm]			Min. L	Max. L	Min. L	Max. L
SFC-005DA2	0.6	0.03	0.20	0.5 (On one side)	±0.1	10000	C	0.33×10^-6	0.62×10^-6	0.009	0.017
SFC-010DA2	1	0.08	0.44	1 (On one side)	±0.2	10000	C	0.72×10^-6	1.38×10^-6	0.014	0.026
SFC-020DA2	2	0.10	0.46	1 (On one side)	±0.33	10000	C	3.02×10^-6	5.30×10^-6	0.031	0.054
SFC-025DA2	4	0.09	0.46	1 (On one side)	±0.38	10000	C	4.55×10^-6	7.95×10^-6	0.036	0.061
SFC-030DA2	5	0.11	0.48	1 (On one side)	±0.4	10000	A	6.09×10^-6	12.80×10^-6	0.046	0.085
							B	8.11×10^-6	14.82×10^-6	0.053	0.091
							C	10.22×10^-6	16.93×10^-6	0.061	0.099
SFC-035DA2	10	0.15	0.54	1 (On one side)	±0.5	10000	C	23.85×10^-6	35.97×10^-6	0.108	0.161
SFC-040DA2	12	0.15	0.54	1 (On one side)	±0.6	10000	A	25.06×10^-6	44.76×10^-6	0.107	0.174
							B	30.89×10^-6	50.62×10^-6	0.116	0.182
							C	37.58×10^-6	57.31×10^-6	0.130	0.197
SFC-050DA2	25	0.16	0.63	1 (On one side)	±0.8	10000	A	77.42×10^-6	144.3×10^-6	0.205	0.347
							B	97.97×10^-6	164.8×10^-6	0.225	0.365
							C	120.8×10^-6	187.6×10^-6	0.252	0.394
SFC-055DA2	40	0.16	0.60	1 (On one side)	±0.84	10000	C	226.8×10^-6	325.0×10^-6	0.378	0.538
SFC-060DA2	60	0.19	0.63	1 (On one side)	±0.9	10000	A	210.8×10^-6	340.1×10^-6	0.382	0.567
							B	269.9×10^-6	399.2×10^-6	0.424	0.609
							C	333.5×10^-6	462.8×10^-6	0.484	0.669

* Types A / B / C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer.

* Check the "Standard Bore Diameters" for SFC (DA2) as there may be limitations on the rated torque caused by the holding power of the coupling shaft section.

* Max. rotation speed does not take into account dynamic balance.

* The moment of inertia and mass are measured for the maximum bore diameter.

* See "Specifications" for SFC (DA2) for stiffness values.

Dimensions

Unit [mm]

Model	d1^*1		d2^*1		D	N	L			LF	S	A1	A2	C	d3	K	M	Tightening torque [N·m]	Type
Model	Min.	Max.	Min.	Max.	D	N	Std.	Min.	Max.	LF	S	A1	A2	C	d3	K	M	Tightening torque [N·m]	Type
SFC-005DA2	3	6	3	6	16	--	23.2	21	40	7.85	1	--	4.8	2.5	6.5	6.5	1-M2	0.4 to 0.5	C
SFC-010DA2	3	8	3	8	19	--	25.9	24	45	9.15	1.05	--	5.8^*2	3.15	8.5	8.5	1-M2.5^*3	1.0 to 1.1^*3	C
SFC-020DA2	4	10	4	11	26	--	32.3	29	50	10.75	1.65	--	9.5	3.3	10.6	10.6	1-M2.5	1.0 to 1.1	C
SFC-025DA2	5	14	5	14	29	--	32.8	29	50	10.75	1.9	--	11	3.3	15	14.5	1-M2.5	1.0 to 1.1	C
SFC-030DA2	5	10	5	10	34	21.6	37.8	34	55	12.4	2.5	8	--	3.75	15	14.5	1-M3	1.5 to 1.9	A
	5	10	>10	16		21.6						8	12.5						B
	>10	14	>10	16		--						--	12.5						C
SFC-035DA2	6	16	6	19	39	--	48	43	65	15.5	3	--	14	4.5	17	17	1-M4	3.4 to 4.1	C
SFC-040DA2	8	15	8	15	44	29.6	48	43	65	15.5	3	11	--	4.5	20	19.5	1-M4	3.4 to 4.1	A
	8	15	>15	24		29.6						11	17						B
	>15	19	>15	24		--						--	17						C
SFC-050DA2	8	19	8	19	56	38	59.8	53	80	20.5	2.4	14.5	--	6	26	26	1-M5	7.0 to 8.5	A
	8	19	>19	30		38						14.5	22						B
	>19	25	>19	30		--						--	22						C
SFC-055DA2	10	30	10	30	63	--	68.7	60	85	24	2.6	--	23	7.75	31	31	1-M6	14 to 15	C
SFC-060DA2	11	24	11	24	68	46	73.3	65	90	25.2	3.2	17.5	--	7.75	31	31	1-M6	14 to 15	A
	11	24	>24	35		46						17.5	26.5						B
	>24	30	>24	35		--						--	26.5						C

* Types A / B / C are automatically specified by Miki Pulley according to the combination of bore diameters you select, and cannot be specified by the customer.

* The nominal diameter for the clamping bolt M is equal to the quantity minus the nominal diameter of the screw threads, where the quantity is for a hub on one side.

* The figures in parentheses ( ) for the SFC-010 are the values when d1 or d2 is ø8 mm.

* Compatible lengths L range from the minimum L dimension to the maximum L dimension shown in the above table. Specify in 1 mm units.

* When the L dimension is shorter than the standard, the left/right clamping bolt phases will be off by 45°.

* Check Standard Bore Diameters for SFC(DA2) for the standard bore diameters.

Tapered shaft supported
- • SFC (SA2)
  Specifications
  
  Dimensions
- • SFC (DA2)
  Specifications
  
  Dimensions
For length-specifi ed special order parts
- • SFC (DA2)
  Specifications
  
  Dimensions
For keyway milling applications
- • SFC (SA2/DA2)
  Dimensions
  
  Standard Bore Diameter

Keyway milling applications If you are using a keyed shaft, we can mill a keyway in the clamping hub to your specifications.

SFC (SA2/DA2)

Dimensions

Unit [mm]

Compatible with H9 Class standard keyway widths				Compatible with JS9 Class standard keyway widths
Nominal bore diameter	Bore diameter (d1, d2)	Keyway width (W1, W2)	Keyway height (T1, T2)	Nominal bore diameter	Bore diameter (d1, d2)	Keyway width (W1, W2)	Keyway height (T1, T2)
8BH	8	3^+0.025₀	9.4^+0.3₀	8BJ	8	3±0.0125	9.4^+0.3₀
9BH	9	3^+0.025₀	10.4^+0.3₀	9BJ	9	3±0.0125	10.4^+0.3₀
10BH	10	3^+0.025₀	11.4^+0.3₀	10BJ	10	3±0.0125	11.4^+0.3₀
11BH	11	4^+0.030₀	12.8^+0.3₀	11BJ	11	4±0.0150	12.8^+0.3₀
12BH	12	4^+0.030₀	13.8^+0.3₀	12BJ	12	4±0.0150	13.8^+0.3₀
13BH	13	5^+0.030₀	15.3^+0.3₀	13BJ	13	5±0.0150	15.3^+0.3₀
14BH	14	5^+0.030₀	16.3^+0.3₀	14BJ	14	5±0.0150	16.3^+0.3₀
15BH	15	5^+0.030₀	17.3^+0.3₀	15BJ	15	5±0.0150	17.3^+0.3₀
16BH	16	5^+0.030₀	18.3^+0.3₀	16BJ	16	5±0.0150	18.3^+0.3₀
17BH	17	5^+0.030₀	19.3^+0.3₀	17BJ	17	5±0.0150	19.3^+0.3₀
18BH	18	6^+0.030₀	20.8^+0.3₀	18BJ	18	6±0.0150	20.8^+0.3₀
19BH	19	6^+0.030₀	21.8^+0.3₀	19BJ	19	6±0.0150	21.8^+0.3₀
20BH	20	6^+0.030₀	22.8^+0.3₀	20BJ	20	6±0.0150	22.8^+0.3₀
22BH	22	6^+0.030₀	24.8^+0.3₀	22BJ	22	6±0.0150	24.8^+0.3₀
24BH	24	8^+0.036₀	27.3^+0.3₀	24BJ	24	8±0.0180	27.3^+0.3₀
25BH	25	8^+0.036₀	28.3^+0.3₀	25BJ	25	8±0.0180	28.3^+0.3₀
28BH	28	8^+0.036₀	31.3^+0.3₀	28BJ	28	8±0.0180	31.3^+0.3₀
30BH	30	8^+0.036₀	33.3^+0.3₀	30BJ	30	8±0.0180	33.3^+0.3₀
32BH	32	10^+0.036₀	35.3^+0.3₀	32BJ	32	10±0.0180	35.3^+0.3₀
35BH	35	10^+0.036₀	38.3^+0.3₀	35BJ	35	10±0.0180	38.3^+0.3₀
38BH	38	10^+0.036₀	41.3^+0.3₀	38BJ	38	10±0.0180	41.3^+0.3₀
40BH	40	12^+0.043₀	43.3^+0.3₀	40BJ	40	12±0.0215	43.3^+0.3₀
42BH	42	12^+0.043₀	45.3^+0.3₀	42BJ	42	12±0.0215	45.3^+0.3₀
45BH	45	14^+0.043₀	48.8^+0.3₀	45BJ	45	14±0.0215	48.8^+0.3₀

*We can also handle standards not listed above. Consult Miki Pulley.

Standard Bore Diameter

Model	Standard bore diameter, d2 (mm)
Model	8	9	10	11	12	13	14	15	16	17	18	19	20	22	24	25	28	30	32	35	38	40	42	45
SFC-025	●	●	●	●	●	●	●
SFC-030	●	●	●	●	●	●	●	○	○
SFC-035	●	●	●	●	●	●	●	●	●	○	○	○
SFC-040	9	●	●	●	●	●	●	●	●	●	●	●	○	○	○
SFC-050	18	20	22	●	●	●	●	●	●	●	●	●	●	●	●	●	○	○
SFC-055			31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
SFC-060				50	51	●	●	●	●	●	●	●	●	●	●	●	●	●	○	○
SFC-080											●	●	●	●	●	●	●	●	●	●	○	○
SFC-090																●	●	●	●	●	●	●	○	○
SFC-100																			226	●	●	●	●	●

* The shaft tolerance for standard bore diameter is h7 (h6 or g6): designation B. However, for a bore diameter of ø35, the shaft tolerance is －0.025 to ＋0.010.

* Shaft tolerances j6/k6: designations J/K are optional, and are only supported for bore diameters marked with ○ .

* Bore diameters marked with ● or numbers are supported as the standard bore diameters. Consult Miki Pulley regarding special arrangements which may be possible for other bore diameters.

Related Product

Basic Specifications

Max. nominal torque 30N･m

Bore ranges 3 mm to 30 mm

Backlash Zero

Basic Specifications

Max. nominal torque 18000 N･m

Pilot-bore additional processing range 11 mm to 180 mm

Operating temperature -30℃ to 90℃

Basic Specifications

Max. nominal torque 2.0 N･m

Pilot-bore additional processing range 3 mm to 14 mm

Operating temperature -40℃ to 100℃

Basic Specifications

Max. rated torque 490 N･m

Bore ranges 16 mm to 48 mm

Backlash Zero

SFC Models

Features of SFC Models

SFC Models Specifications

Lineup

Structure and Materials

Options of SFC Models

Tapered shaft supported Allows coupling clamping hub when a taper adapter is mounted on the tapered shaft of a servo motor.

For length-specifi ed special order parts SFC (DA2) couplings can be made in specific lengths that match the distance between shafts by changing the length of the spacer. Specify the length in 1 mm units.

Keyway milling applications If you are using a keyed shaft, we can mill a keyway in the clamping hub to your specifications.

Related Product