SFC-DA2 Types - SERVOFLEX - Coupling Miki Pulley - Miki Pullley Vietnam

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-DA2 Types
[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］
		Parallel ［mm］	Angular ［°］	Axial ［mm］
SFC-002DA2	0.25	0.03	0.5 (On one side)	±0.08	10000	95	17	C	0.07×10-6	0.004
SFC-005DA2	0.6	0.05	0.5 (On one side)	±0.1	10000	250	70	C	0.37×10-6	0.010
SFC-010DA2	1	0.11	1 (On one side)	±0.2	10000	700	70	C	0.80×10-6	0.015
SFC-020DA2	2	0.15	1 (On one side)	±0.33	10000	1850	32	C	3.43×10-6	0.035
SFC-025DA2	4	0.16	1 (On one side)	±0.38	10000	2800	30	C	5.26×10-6	0.040
SFC-030DA2	5	0.18	1 (On one side)	±0.4	10000	4000	32	A	7.43×10-6	0.054
								B	9.45×10-6	0.060
								C	11.56×10-6	0.068
SFC-035DA2	8	0.24	1 (On one side)	±0.5	10000	9000	56	C	27.05×10-6	0.122
SFC-040DA2	10	0.24	1 (On one side)	±0.6	10000	10000	40	A	29.98×10-6	0.124
								B	36.25×10-6	0.134
								C	42.95×10-6	0.149
SFC-050DA2	25	0.28	1 (On one side)	±0.8	10000	16000	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 (On one side)	±0.9	10000	25000	21.5	C	261.3×10-6	0.459
SFC-060DA2	60	0.34	1 (On one side)	±0.9	10000	35000	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 (On one side)	±1.10	10000	70000	64	C	1039×10-6	1.037
SFC-090DA2	180	0.52	1 (On one side)	±1.30	10000	50000	54	C	1798×10-6	1.369
SFC-100DA2	250	0.55	1 (On one side)	±1.48	10000	60000	55.5	C	2754×10-6	1.739
*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	d1*1		d2*1		D	DB	N	L	LF	LP	S	A1	A2	C	d3	K	M	Tightening torque ［N・m］	Type
	Min.	Max.	Min.	Max.
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＊2	3.15	8.5	8.5	1-M2.5*3	1.0～1.1＊3	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	18	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	Over 15	22								11	17						B
	Over 15	19	Over 15	22			─					─	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	Over 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 rated torque of the coupling may be limited for bore diameters marked with *1. Consult "Standard Bore Diameters".
*The øDB value is measured assuming that the head of the clamping bolt is larger than the external diameter of the 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.
*For items marked with *2, d1 or d2 may be from ø3 to ø7 in some cases. If d1 or d2 is ø8, this value is 6.
*For items marked with *3, d1 or d2 may range from φ3 mm to φ7 mm. The value is M2 for a d1 or d2 of φ8 mm. The tightening torque for M2 is 0.4 N·m to 0.5 N·m.
*The recommended processing tolerance for paired mounting shafts is the h7 class. However, for a shaft diameter of ø35, the tolerance is －0.025 to ＋0.010. Consult Miki Pulley for special tolerances other than h7 class.
[Standard bore diameter]
Model	Standard bore diameter d1 ［mm］		Standard bore diameter d2 ［mm］
	Min.	Max.	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
SFC-002DA2	3	5	●	●	●
SFC-005DA2	3	6	●	●	●	●
SFC-010DA2	3	8	●	●	●	●	●	●	●
SFC-020DA2	4	10		●	●	●	●	●	●	●	●	●	○
SFC-025DA2	5	14			2.1	●	●	●	●	●	●	●	●	●	●	●
SFC-030DA2	5	14			2.8	3.4	●	●	●	●	●	●	●	●	●	●	○	○
SFC-035DA2	6	16				5	5	6.6	●	●	●	●	●	●	●	●	●	●	○	○
SFC-040DA2	8	19							9	●	●	●	●	●	●	●	●	●	●	●	●	○	○
SFC-050DA2	8	25							18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	○	○
SFC-055DA2	10	30										31	34	36	38	●	●	●	●	●	●	●	●	●	●	●	●
SFC-060DA2	11	30											50	51	●	●	●	●	●	●	●	●	●	●	●	●	●	○	○
SFC-080DA2	18	35																		●	●	●	●	●	●	●	●	●	●	○	○
SFC-090DA2	25	40																							●	●	●	●	●	●	●	○	○
SFC-100DA2	32	45																										226	●	●	●	●	●
*Bore diameters marked with ● , ○ , or numbers are supported as the standard bore diameters.
*Bore diameters marked with ○ have restrictions on the inner diameter of the element, so they can only be used with d2 side hubs. Example of product that cannot be manufactured: SFC-020DA2-11B-11B; example of product that can be manufactured: SFC-020DA2-10B-11B
*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].
*These range of applicable bore diameters is between the minimum and maximum bore diameters of the dimensions table. Consult Miki Pulley regarding special arrangements for other bore diameters.



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