SFR Models

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Features of SFR Models

High damping performance rubber coupling for servo motors and stepping motors. The newly developed rubber element achieves high damping and low reaction force. It absorbs vibrations more quickly than flexible couplings that use metal for their elastic parts. This suppresses the resonance phenomenon that can occur in stepping motors, etc.

Excellent damping performance

The SERVOFLEX SFR rubber element couplings provide better damping performance than standard metal disc couplings.

Shaft counterforce is also reduced

Assembly structure with certain gap greatly reduce the reaction force in the eccentric and axial directions.

A wide range of variations and options available

Low inertia by suitable hub shape depends on bore size. You can also select various options.

Integrated element structure of hard rubber and insert

Clamp hub and element is assembled by friction force of tightening bolts. Optimal design with the help of the latest CAE system,FEM (finite element method).

SFR Models Specifications

SFR Models

SFR Models

[Specifications]

Model	Shape type	Rated	Misalignment			Max. rotation speed ［min^-1］	Torsional stiffness ［N･m/rad］	Axial stiffness [N/mm]	Moment of inertia ［kg･m²］	Mass［kg］
Model	Shape type	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］
SFR-030SA1	A	5	0.2	1.5	±0.3	10000	396	413	6.62×10^-6	0.048
	B								8.65×10^-6	0.054
	C								10.76×10^-6	0.063
SFR-035SA1	C	10	0.2	1.5	±0.3	10000	607	416	26.98×10^-6	0.105
SFR-040SA1	A	12	0.2	1.5	±0.3	10000	1128	605	25.37×10^-6	0.103
	B								31.96×10^-6	0.114
	C								38.64×10^-6	0.128
SFR-050SA1	A	25	0.2	1.5	±0.3	10000	2775	658	85.36×10^-6	0.216
	B								105.75×10^-6	0.234
	C								128.36×10^-6	0.263

* 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 are analysis values for the element taken at a temperature of 20℃.

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

[Dimensions]

Model	Shape type	d1[mm]		d2[mm]		D[mm]	N[mm]	L[mm]	LF[mm]	LP[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	d3 [mm]	M Quantity - Nominal dia.	Tightening torque [N・m]
Model	Shape type	Min.	Max.	Min.	Max.	D[mm]	N[mm]	L[mm]	LF[mm]	LP[mm]	S[mm]	A1[mm]	A2[mm]	C[mm]	d3 [mm]	M Quantity - Nominal dia.	Tightening torque [N・m]
SFR-030SA1	A	5	10	5	10	34	21.6	37.8	12.4	11	1	8	-	3.75	15.5	1-M3	1.5～1.9
	B	5	10	Over10	16		21.6					8	12.5			1-M3	1.5～1.9
	C	Over10	15	Over10	16		-					-	12.5			1-M3	1.5～1.9
SFR-035SA1	C	6	18	6	19	39	-	48	15.5	15	1	-	14	4.5	18.5	1-M4	3.4~4.1
SFR-040SA1	A	8	15	8	15	44	29.6	48	15.5	15	1	11	-	4.5	23.5	1-M4	3.4~4.1
	B	8	15	Over15	24		29.6					11	17			1-M4	3.4~4.1
	C	Over15	22	Over15	24		-					-	17			1-M4	3.4~4.1
SFR-050SA1	A	8	19	8	19	56	38	59.8	20.5	17.4	0.7	14.5	-	6	29.5	1-M5	7.0~8.5
	B	8	19	Over19	30		38					14.5	22			1-M5	7.0~8.5
	C	Over19	28	Over19	30		-					-	22			1-M5	7.0~8.5

* 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 d3 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.

[Standard bore diameter]

Standard (option) bore diameter, d1/d2 [mm] and restricted rated torque [N･m]
Nominal bore diameter			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
Shaft tolerance	h7(h6･g6)	B	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J																	〇		〇	〇		〇
	k6(Option)	K					〇	〇						〇		〇			〇		〇	〇
Supported bore diameter for each mode	SFR-030SA1	d1	2.8	3.4	●	●	●	●	●	●	●	●	●	●	●
	SFR-030SA1	d2	2.8	3.4	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-035SA1	d1		5	5	6.6	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-035SA1	d2		5	5	6.6	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-040SA1	d1					9	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-040SA1	d2					9	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1	d1					18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1	d2					18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

* 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.

* 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].

Options of SFR Models

Tapered shaft supported
- Specifications
  
  Dimensions
  
  Standard bore diameter
Keyway milling standard
- Standard bore diameters
  
  Standard bore diameter

Tapered shaft supportedAllows coupling via a clamp hub when a taper adapter is mounted on the tapered shaft of a servo motor.

Specifications

Model	Shape 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］
			Parallel	Angular	Axial
			［mm］	［°］	［mm］
SFR-040SA1-□B-11BC	B	12	0.15	1.5	±0.3	10000	1128	605	35.95×10^-6	0.162
SFR-040SA1-□B-11BC	C	12	0.15	1.5	±0.3	10000	1128	605	42.24×10^-6	0.174
SFR-050SA1-□B-11BC	B	25	0.15	1.5	±0.3	10000	2775	658	111.04×10^-6	0.297
SFR-050SA1-□B-11BC	C	25	0.15	1.5	±0.3	10000	2775	658	133.26×10^-6	0.325
SFR-050SA1-□B-14BC	B	25	0.15	1.5	±0.3	10000	2775	658	118.21×10^-6	0.328
SFR-050SA1-□B-14BC	C	25	0.15	1.5	±0.3	10000	2775	658	141.08×10^-6	0.369
SFR-050SA1-□B-16BC	B	25	0.15	1.5	±0.3	10000	2775	658	124.92×10^-6	0.366
SFR-050SA1-□B-16BC	C	25	0.15	1.5	±0.3	10000	2775	658	147.53×10^-6	0.395

* 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 Quantity - Nominal dia.
SFR-040SA1-□B-11BC	11	4	12.2	18	16	17	22	58	44	48	15.5	4.5	11	17	1-M4
SFR-050SA1-□B-11BC	11	4	12.2	18	16	17	22	64.8	56	59.8	20.5	6	14.5	22	1-M5
SFR-050SA1-□B-14BC	14	4	15.1	24	19	22	28	69.8	56	59.8	20.5	6	14.5	22	1-M5
SFR-050SA1-□B-16BC	16	5	17.3	24	29	26	30	79.8	56	59.8	20.5	6	14.5	22	1-M5

* For other dimensions, see dimensions for SFR MODEL

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
Shaft tolerance	h7(h6･g6)	B	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J													〇		〇	〇		〇
	k6(Option)	K	〇	〇						〇		〇			〇		〇	〇
Bore diameter	SFR-040SA1-□B-11BC		9	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1-□B-11BC		18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1-□B-14BC		18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1-□B-16BC		18	20	22	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●

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.

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

Keyway milling standard

Unit [mm]

H9 keyway width standards														JS9 keyway width standards
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 dia.	Shaft tolerance						Shaft dia.	Shaft tolerance						Shaft dia.	Shaft tolerance						Shaft dia.	Shaft tolerance
Shaft dia.	h7	j6	k6				Shaft dia.	h7	j6	k6				Shaft dia.	h7	j6	k6				Shaft dia.	h7	j6	k6
8	BH	-	KH	8	3^+0.025₀	9.4^+0.3₀	17	BH	-	-	17	5^+0.030₀	19.3^+0.3₀	8	BJ	-	KJ	8	3±0.0125	9.4^+0.3₀	17	BJ	-	-	17	5±0.0150	19.3^+0.3₀
9	BH	-	KH	9	3^+0.025₀	10.4^+0.3₀	18	BH	-	-	18	6^+0.030₀	20.8^+0.3₀	9	BJ	-	KJ	9	3±0.0125	10.4^+0.3₀	18	BJ	-	-	18	6±0.0150	20.8^+0.3₀
10	BH	-	-	10	3^+0.025₀	11.4^+0.3₀	19	BH	JH	KH	19	6^+0.030₀	21.8^+0.3₀	10	BJ	-	-	10	3±0.0125	11.4^+0.3₀	19	BJ	JJ	KJ	19	6±0.0150	21.8^+0.3₀
11	BH	-	-	11	4^+0.030₀	12.8^+0.3₀	20	BH	-	-	20	6^+0.030₀	22.8^+0.3₀	11	BJ	-	-	11	4±0.0150	12.8^+0.3₀	20	BJ	-	-	20	6±0.0150	22.8^+0.3₀
12	BH	-	-	12	4^+0.030₀	13.8^+0.3₀	22	BH	JH	KH	22	6^+0.030₀	24.8^+0.3₀	12	BJ	-	-	12	4±0.0150	13.8^+0.3₀	22	BJ	JJ	KJ	22	6±0.0150	24.8^+0.3₀
13	BH	-	-	13	5^+0.030₀	15.3^+0.3₀	24	BH	JH	KH	24	8^+0.036₀	27.3^+0.3₀	13	BJ	-	-	13	5±0.0150	15.3^+0.3₀	24	BJ	JJ	KJ	24	8±0.0180	27.3^+0.3₀
14	BH	-	KH	14	5^+0.030₀	16.3^+0.3₀	25	BH	-	-	25	8^+0.036₀₀	28.3^+0.3₀	14	BJ	-	KJ	14	5±0.0150	16.3^+0.3₀	25	BJ	-	-	25	8±0.0180	28.3^+0.3₀
15	BH	-	-	15	5^+0.030₀	17.3^+0.3₀	28	BH	JH	-	28	8^+0.036₀₀	31.3^+0.3₀	15	BJ	-	-	15	5±0.0150	17.3^+0.3₀	28	BJ	JJ	-	28	8±0.0180	31.3^+0.3₀
16	BH	-	KH	16	5^+0.030₀	18.3^+0.3₀	30	BH	-	-	30	8^+0.036₀	33.3^+0.3₀	16	BJ	-	KJ	16	5±0.0150	18.3^+0.3₀	30	BJ	-	-	30	8±0.0180	33.3^+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 dia.			8	9	10	11	12	13	14	15	16	17	18	19	20	22	24	25	28	30
Shaft tolerance	h7(h6･g6)	B	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	j6(Option)	J												○		○	○		○
	k6(Option)	K	○	○					○		○			○		○	○
Bore diameter	SFR-030SA1	d1	●	●	●	●	●	●	●	●
	SFR-030SA1	d2	●	●	●	●	●	●	●	●	●
	SFR-035SA1	d1	●	●	●	●	●	●	●	●	●	●	●
	SFR-035SA1	d2	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-040SA1	d1	9	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-040SA1	d2	9	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1	d1	18	20	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●
	SFR-050SA1	d2	18	20	22	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

* 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.

Related Product

Basic Specifications

Max. rated torque 220 N･m

Bore ranges 3 mm to 35 mm

Operating temperature -30℃ to 100℃

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. rated torque 800 N･m

Standard bore-drilling range 8 mm to 60 mm

Backlash Zero

Basic Specifications

Max. rated torque 490 N･m

Bore ranges 16 mm to 48 mm

Backlash Zero

SFR Models

Features of SFR Models

SFR Models Specifications

Structure and Materials

Options of SFR Models

Tapered shaft supportedAllows coupling via a clamp hub when a taper adapter is mounted on the tapered shaft of a servo motor.

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

Related Product