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	Type	Rated torque ［N·m]	Moment of inertia［kg·m²]	Mass ［kg]
Model	SFC-040SA2-□B-11BC	B	12	26.58×10^-6	0.131
C	SFC-040SA2-□B-11BC	12	33.28×10^-6	0.146
SFC-050SA2-□B-11BC	B	25	82.91×10^-6	0.240
SFC-050SA2-□B-11BC	C	25	103.5×10^-6	0.258
SFC-050SA2-□B-14BC	B	25	88.72×10^-6	0.271
SFC-050SA2-□B-14BC	C	25	111.5×10^-6	0.301
SFC-050SA2-□B-16BC	B	25	95.44×10^-6	0.309
SFC-050SA2-□B-16BC	C	25	118.2×10^-6	0.338
SFC-055SA2-□B-14BC	C	40	201.1×10^-6	0.409
SFC-055SA2-□B-16BC	C	40	207.8×10^-6	0.446
SFC-060SA2-□B-16BC	B	60	228.7×10^-6	0.475
SFC-060SA2-□B-16BC	C	60	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 Qty - Nominal dia.
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).

Standard　Bore Diameter

Standard (option) bore diameter, d1 [mm] and restricted rated torque [N∙m]
Nominal bore 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	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J													○		○	○		○
	k6(Option)	K	○	○						○		○			○		○	○				○
Bore diameter	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 shaft tolerance for standard bore diameter is h7 (h6 or g6): designation B.

* 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.

SFC (DA2)

Specifications

Model	Type	Rated torque ［N/mm]	Moment of inertia［kg·m²]	Mass ［kg]
Model	Type	Rated torque ［N/mm]	Moment of inertia［kg·m²]	Mass ［kg]
SFC-040DA2-□B-11BC	B	12	39.42×10^-6	0.180
SFC-040DA2-□B-11BC	C	12	46.12×10^-6	0.195
SFC-050DA2-□B-11BC	B	25	125.5×10^-6	0.331
SFC-050DA2-□B-11BC	C	25	146.1×10^-6	0.349
SFC-050DA2-□B-14BC	B	25	131.1×10^-6	0.362
SFC-050DA2-□B-14BC	C	25	154.1×10^-6	0.392
SFC-050DA2-□B-16BC	B	25	138.1×10^-6	0.400
SFC-050DA2-□B-16BC	C	25	160.8×10^-6	0.430
SFC-055DA2-□B-14BC	C	40	274.0×10^-6	0.530
SFC-055DA2-□B-16BC	C	40	280.5×10^-6	0.567
SFC-060DA2-□B-16BC	B	60	339.4×10^-6	0.638
SFC-060DA2-□B-16BC	C	60	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 Qty - Nominal dia.
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).

Standard Bore Diameter

Standard (option) bore diameter, d1 [mm] and restricted rated torque [N∙m]
Nominal bore 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	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J													○		○	○		○
	k6(Option)	K	○	○						○		○			○		○	○				○
Bore diameter	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 shaft tolerance for standard bore diameter is h7 (h6 or g6): designation B.

* 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.

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	Type	Rated torque ［N·m]	Misalignment				Max. rotation speed ［min^-1]	Moment of inertia ［kg·m²]		Mass ［kg]
			Parallel ［mm]	Parallel ［mm]	Angular ［°]	Axial ［mm]		Moment of inertia ［kg·m²]
			Min. L	Max. L	Angular ［°]	Axial ［mm]		Min. L	Max. L
SFC-005DA2	C	0.6	0.03	0.20	0.5 (On one side)	±0.1	10000	0.33×10^-6	0.62×10^-6	0.009	0.017
SFC-010DA2	C	1	0.08	0.44	1 (On one side)	±0.2	10000	0.72×10^-6	1.38×10^-6	0.014	0.026
SFC-020DA2	C	2	0.10	0.46	1 (On one side)	±0.33	10000	3.02×10^-6	5.30×10^-6	0.031	0.054
SFC-025DA2	C	4	0.09	0.46	1 (On one side)	±0.38	10000	4.55×10^-6	7.95×10^-6	0.036	0.061
SFC-030DA2	A	5	0.11	0.48	1 (On one side)	±0.4	10000	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	C	10	0.15	0.54	1 (On one side)	±0.5	10000	23.85×10^-6	35.97×10^-6	0.108	0.161
SFC-040DA2	A	12	0.15	0.54	1 (On one side)	±0.6	10000	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	A	25	0.16	0.63	1 (On one side)	±0.8	10000	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	C	40	0.16	0.60	1 (On one side)	±0.84	10000	226.8×10^-6	325.0×10^-6	0.378	0.538
SFC-060DA2	A	60	0.19	0.63	1 (On one side)	±0.9	10000	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	Type	d1[mm]		d2[mm]		D	N	L			LF	S	A1	A2	C	d3	K	M	Tightening torque [N·m]
Model	Type	Min.	Max.	Min.	Max.	D	N	Std.	Min.	Max.	LF	S	A1	A2	C	d3	K	M	Tightening torque [N·m]
SFC-005DA2	C	3	6	3	6	16	--	23.2	21	40	7.85	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	24	45	9.15	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	29	50	10.75	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	29	50	10.75	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	34	55	12.4	2.5	8	--	3.75	15	14.5	1-M3	1.5～1.9
	B	5	10	>10	16		21.6						8	12.5
	C	>10	14	>10	16		--						--	12.5
SFC-035DA2	C	6	16	6	19	39	--	48	43	65	15.5	3	--	14	4.5	17	17	1-M4	3.4～4.1
SFC-040DA2	A	8	15	8	15	44	29.6	48	43	65	15.5	3	11	--	4.5	20	19.5	1-M4	3.4～4.1
	B	8	15	>15	24		29.6						11	17
	C	>15	19	>15	24		--						--	17
SFC-050DA2	A	8	19	8	19	56	38	59.8	53	80	20.5	2.4	14.5	--	6	26	26	1-M5	7.0～8.5
	B	8	19	>19	30		38						14.5	22
	C	>19	25	>19	30		--						--	22
SFC-055DA2	C	10	30	10	30	63	--	68.7	60	85	24	2.6	--	23	7.75	31	31	1-M6	14～15
SFC-060DA2	A	11	24	11	24	68	46	73.3	65	90	25.2	3.2	17.5	--	7.75	31	31	1-M6	14～15
	B	11	24	>24	35		46						17.5	26.5
	C	>24	30	>24	35		--						--	26.5

* 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 dia.				Bore dia. d1･d2 mm	Keyway width W1･W2 [mm]	Keyway height T1･T2 [mm]	Nominal bore dia.				Bore dia. d1･d2 mm	Keyway width W1･W2 [mm]	Keyway height T1･T2 [mm]	Nominal bore dia.				Bore dia. d1･d2 mm	Keyway width W1･W2 [mm]	Keyway height T1･T2 [mm]	Nominal bore dia.				Bore dia. d1･d2 mm	Keyway width W1･W2 [mm]	Keyway height T1･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^+0.430₀	43.3^+0.3₀	17	BJ	-	-	17	5±0.0150	19.3^+0.3₀	40	BJ	-	-	40	12±0.0125	43.3^+0.3₀
18	BH	-	-	18	6^+0.030₀	20.8^+0.3₀	42	BH	-	-	42	12^+0.430₀	45.3^+0.3₀	18	BJ	-	-	18	6±0.0150	20.8^+0.3₀	42	BJ	-	-	42	12±0.0125	45.3^+0.3₀
19	BH	-	KH	19	6^+0.030₀	21.8^+0.3₀	45	BH	-	-	45	14^+0.430₀	48.8^+0.3₀	19	BJ	JJ	KJ	19	6±0.0150	21.8^+0.3₀	45	BJ	-	-	45	14±0.0125	48.8^+0.3₀

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

Standard Bore Diameter

Standard (option) bore diameter, d1/d2 [mm] and restricted rated torque [N∙m]
Nominal bore diameter			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 model	SFC-025	d1	●	●	●	●	●	●	●	●
	SFC-025	d2	●	●	●	●	●	●	●	●
	SFC-030	d1	●	●	●	●	●	●	●	●
	SFC-030	d2	●	●	●	●	●	●	●	●	●	●
	SFC-035	d1	●	●	●	●	●	●	●	●	●	●
	SFC-035	d2	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-040	d1	9	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-040	d2	9	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-050	d1	18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-050	d2	18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-055	d1				31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-055	d2				31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-060	d1					50	51	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-060	d2					50	51	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFC-080	d1												●	●	●	●	●	●	●	●	●	●
	SFC-080	d2												●	●	●	●	●	●	●	●	●	●	●	●
	SFC-090	d1																	●	●	●	●	●	●	●
	SFC-090	d2																	●	●	●	●	●	●	●	●	●
	SFC-100	d1																				226	●	●	●	●	●
	SFC-100	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～+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.

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Basic Specifications

Max. nominal torque 370 N･m

Pilot-bore additional processing range 9 mm to 65 mm

Operating temperature -30℃ to 90℃

Basic Specifications

Max. nominal torque 5 N･m

Bore ranges 3 mm to 20 mm

Operating temperature -30℃ to 100℃

Basic Specifications

Max. rated torque 800 N･m

Standard bore-drilling range 8 mm to 60 mm

Backlash Zero

Basic Specifications

Max. nominal torque 310 N･m

Bore ranges 3 mm to 60 mm

Operating temperature -30℃ to 80℃

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.

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