SFC Model

Features

Specifications

Structure and Materials

Downloads

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]

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

[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]

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. * 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].

Download 3D CAD

SFC-002SA2	(Shaft bore diameter [d1]:3~5 Shaft bore diameter[d2]:3~5)
SFC-005SA2	(Shaft bore diameter [d1]:3~6 Shaft bore diameter[d2]:3~6)
SFC-010SA2	(Shaft bore diameter[d1]:3~8 Shaft bore diameter[d2]:3~8)
SFC-020SA2	(Shaft bore diameter[d1]:4~10 Shaft bore diameter[d2]:4~11)
SFC-025SA2	(Shaft bore diameter[d1]:5~14 Shaft bore diameter[d2]:5~14)
SFC-030SA2	(Shaft bore diameter[d1]:5~14 Shaft bore diameter[d2]:5~16)
SFC-035SA2	(Shaft bore diameter[d1]:6~16 Shaft bore diameter[d2]:6~19)
SFC-040SA2	(Shaft bore diameter[d1]:8~19 Shaft bore diameter[d2]:8~24)
SFC-050SA2	(Shaft bore diameter[d1]:8~25 Shaft bore diameter[d2]:8~30)
SFC-055SA2	(Shaft bore diameter[d1]:10~30 Shaft bore diameter[d2]:10~30)
SFC-060SA2	(Shaft bore diameter[d1]:11~30 Shaft bore diameter[d2]:11~35)
SFC-080SA2	(Shaft bore diameter[d1]:18~35 Shaft bore diameter[d2]:18~40)
SFC-090SA2	(Shaft bore diameter[d1]:25~40 Shaft bore diameter[d2]:25~45)
SFC-100SA2	(Shaft bore diameter[d1]:32~45 Shaft bore diameter[d2]:32~45)
SFC-002DA2	(Shaft bore diameter [d1]:3~5 Shaft bore diameter[d2]:3~5)
SFC-005DA2	(Shaft bore diameter[d1]:3~6 Shaft bore diameter[d2]:3~6)
SFC-010DA2	(Shaft bore diameter[d1]:3~8 Shaft bore diameter[d2]:3~8)
SFC-020DA2	(Shaft bore diameter[d1]:4~10 Shaft bore diameter[d2]:4~11)

SFC Model

Ultra-low inertia

Simple, reliable, no backlash

Blocks heat

For tapered shafts

Custom-ordered specific lengths （SFC DA2 types）

SFC-SA2 Types

[Specifications]

[Dimensions]

[Standard bore diameter]

SFC-DA2 Types

[Specifications]

[Dimensions]

[Standard bore diameter]

Lineup

SFC SA2

SFC DA2

SFC SA2/DA2 BC

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