SFM Models

These models were developed to be compatible with spindle applications on machine tools. They are disc spring couplings capable of high precision and high speed. To enable high-precision mounting, both the flange unit and the pressurization flanges are equipped with centering mechanisms. They are also shaped so that the flange covers the periphery of the disc spring with few raised or lowered surfaces to minimize whistling during high speed rotation. Both single-element types with ultra-high torsional stiffness and flexible double-element types that separate double elements with a spacer are available.

Features

Specifications

Structure and Materials

Downloads

Maximum rotation speed 20000 min ^{- 1}

A design specialized for high-speed operation achieves a top speed of 20000 min-1. It delivers stable power transmission at high speed.

High-precision mounting

Since frictional coupling is used to mount on shafts, you can achieve high coupling strength simply by fastening the pressure bolts at the end surface of the flange, in order. And since the pressurization flange is equipped with a centering mechanism, highly precise mounting is easy.

Low noise

A design that covers the outer periphery of the disc spring with the flange and embeds pressure bolts within the pressurization flange minimizes raised and lowered surfaces on the outer periphery and end surfaces. This can greatly reduce whistling at high speeds.

Supports wide range of shaft dimensional tolerances

The basic class for the shaft dimensional tolerances is h7, but a wide range is supported, including k6, m6, and j6.

Balancing is available

We provide optional balancing. This helps achieve dependable high-speed operation.

SFM Model

[Specifications] -Clamping

Model	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	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]
SFM-060SS-□B-□B-60N	60	0.02	1	±0.3	24000	104000	399	0.22×10^-3	0.52
SFM-060SS-□B-□B-80N	80	0.02	1	±0.3	24000	104000	399	0.23×10^-3	0.49
SFM-070SS-□B-□B-90N	90	0.02	1	±0.5	24000	240000	484	0.40×10^-3	0.72
SFM-070SS-□B-□B-100N	100	0.02	1	±0.5	24000	240000	484	0.42×10^-3	0.67
SFM-080SS-□B-□B-150N	150	0.02	1	±0.5	24000	120000	96	0.79×10^-3	1.04
SFM-080SS-□B-□B-200N	200	0.02	1	±0.5	24000	310000	546	1.25×10^-3	1.40
SFM-090SS-□B-□B-250N	250	0.02	1	±0.6	24000	520000	321	1.54×10^-3	1.62
SFM-090SS-□B-□B-300N	300	0.02	1	±0.6	24000	520000	321	1.58×10^-3	1.53
SFM-100SS-□B-□B-450N	450	0.02	1	±0.65	20000	740000	540	3.27×10^-3	2.53
SFM-120SS-□B-□B-600N	600	0.02	1	±0.8	20000	970000	360	6.90×10^-3	3.78

*Torsional stiffness values given are calculated for the element alone. *The moment of inertia and mass are measured for the maximum bore diameter.

[Dimensions] -Clamping

Unit [mm]

Model	d1[mm]	d2[mm]	D[mm]	L[mm]	N1･N2[mm]	LF[mm]	S[mm]	K[mm]	M1･M2 Quantity -Nominal dia.	M1･M2 Tightening torque [N･m]
Model	d1[mm]	d2[mm]	D[mm]	L[mm]	N1･N2[mm]	LF[mm]	S[mm]	K[mm]	M1･M2 Quantity -Nominal dia.	M1･M2 Tightening torque [N･m]	SFM-060SS-□B-□B-60N	12･14･15･16･17･18･19	12･14･15･16･17･18･19･20･22	58	53.4	44	24	5.4	32	2-M6	14
-	24･25･28	58	53.4	48	24	5.4	32	2-M5	7
-	30	58	53.4	52	24	5.4	32	2-M5	7
SFM-060SS-□B-□B-80N	20･22	20･22	58	53.4	44	24	5.4	32	2-M6	14
	24･25･28	24･25･28	58	53.4	48	24	5.4	32	2-M5	7
	30	30	58	53.4	52	24	5.4	32	2-M5	7
SFM-070SS-□B-□B-90N	18･19	18･19･20･22･24･25	68	55.9	47	25	5.9	38	2-M6	14
SFM-070SS-□B-□B-90N	-	28･30･32･35	68	55.9	56	25	5.9	38	2-M6	14
SFM-070SS-□B-□B-100N	20･22･24･25	20･22･24･25	68	55.9	47	25	5.9	38	2-M6	14
SFM-070SS-□B-□B-100N	28･30･32･35	28･30･32･35	68	55.9	56	25	5.9	38	2-M6	14
SFM-080SS-□B-□B-150N	22･24･25	22･24･25	78	68.3	53	30	8.3	37	2-M8	34
SFM-080SS-□B-□B-150N	28･30･32･35	28･30･32･35	78	68.3	56	30	8.3	37	2-M6	14
SFM-080SS-□B-□B-200N	22･24･25	22･24･25	78	67.7	53	30	7.7	42	2-M8	34
	28･30･32･35	28･30･32･35	78	67.7	70	30	7.7	42	2-M8	34
	38	38	78	67.7	74	30	7.7	42	2-M8	34
SFM-090SS-□B-□B-250N	25･28	25･28･30･32	88	68.3	66	30	8.3	50	2-M8	34
SFM-090SS-□B-□B-250N	-	35･38･40･42	88	68.3	74	30	8.3	50	2-M8	34
SFM-090SS-□B-□B-300N	30･32	30･32	88	68.3	66	30	8.3	50	2-M8	34
SFM-090SS-□B-□B-300N	35･38･40･42	35･38･40･42	88	68.3	74	30	8.3	50	2-M8	34
SFM-100SS-□B-□B-450N	32･35･38･40･42･45･48	32･35･38･40･42･45･48	98	90.2	84	40	10.2	56	2-M10	68
SFM-120SS-□B-□B-600N	32･35･38･40･42･45	32･35･38･40･42･45	118	90.2	84	40	10.2	68	2-M10	68
SFM-120SS-□B-□B-600N	48･50･55	48･50･55	118	90.2	100	40	10.2	68	2-M10	68

* Nominal diameter of clamping bolt M1/M2 is given as number of bolts - nominal diameter, and the number is the number for one hub.

[Standard bore diameter combinations] -Clamping

Model	Standard bore diameter d1･d2[mm]
Model	Nominal diameter	12	14	15	16	17	18	19	20	22	24	25	28	30	32	35	38	40	42	45	48	50	55
SFM-060SS-□B-□B-60N	d1	●	●	●	●	●	●	●
SFM-060SS-□B-□B-60N	d2	●	●	●	●	●	●	●	●	●	●	●	●	●
SFM-060SS-□B-□B-80N	d1								●	●	●	●	●	●
SFM-060SS-□B-□B-80N	d2								●	●	●	●	●	●
SFM-070SS-□B-□B-90N	d1						●	●
SFM-070SS-□B-□B-90N	d2						●	●	●	●	●	●	●	●	●	●
SFM-070SS-□B-□B-100N	d1								●	●	●	●	●	●	●	●
SFM-070SS-□B-□B-100N	d2								●	●	●	●	●	●	●	●
SFM-080SS-□B-□B-150N	d1									●	●	●	●	●	●	●
SFM-080SS-□B-□B-150N	d2									●	●	●	●	●	●	●
SFM-080SS-□B-□B-200N	d1									●	●	●	●	●	●	●	●
SFM-080SS-□B-□B-200N	d2									●	●	●	●	●	●	●	●
SFM-090SS-□B-□B-250N	d1											●	●
SFM-090SS-□B-□B-250N	d2											●	●	●	●	●	●	●	●
SFM-090SS-□B-□B-300N	d1													●	●	●	●	●	●
SFM-090SS-□B-□B-300N	d2													●	●	●	●	●	●
SFM-100SS-□B-□B-450N	d1														●	●	●	●	●	●	●
SFM-100SS-□B-□B-450N	d2														●	●	●	●	●	●	●
SFM-120SS-□B-□B-600N	d1														●	●	●	●	●	●	●	●	●
SFM-120SS-□B-□B-600N	d2														●	●	●	●	●	●	●	●	●

* The bore diameters marked with ● are supported as standard bore diameter.

[Balance correction] -Clamping

Model（Size）	Balance classification	Supported rotational speed[min^-1]
Model（Size）	Balance classification	10000 or less	15000 or less	18000 or less	20000 or less	24000 or less
SFM-060SS	G6.3・G2.5	●	●	●	●	●
SFM-070SS	G6.3・G2.5	●	●	●	●	●
SFM-080SS	G6.3・G2.5	●	●	●	●	●
SFM-090SS	G6.3・G2.5	●	●	●	●	●
SFM-100SS	G6.3・G2.5	●	●	●	●
SFM-120SS	G6.3・G2.5	●	●	●	●

* We will perform balance correction for supported rotational speeds marked with ● .

[Specifications] - Wedge Coupling

Model	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	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]
SFM-070SS-□K-□K-100N	100	0.02	1	±0.5	24000	240000	484	0.66×10^-3	0.92
SFM-080SS-□K-□K-150N	150	0.02	1	±0.5	24000	120000	96	1.21×10^-3	1.03
SFM-080SS-□K-□K-200N	200	0.02	1	±0.5	24000	310000	546	1.11×10^-3	1.26
SFM-090SS-□K-□K-300N	300	0.02	1	±0.6	24000	520000	321	1.75×10^-3	1.48
SFM-100SS-□K-□K-450N	450	0.02	1	±0.65	20000	740000	540	2.56×10^-3	1.87
SFM-120SS-□K-□K-600N	600	0.02	1	±0.8	20000	970000	360	5.33×10^-3	2.50
SFM-140SS-□K-□K-800N	800	0.02	1	±1.0	20000	1400000	360	10.28×10^-3	4.66
SFM-140SS-□K-□K-1000N	1000	0.02	1	±1.0	20000	1400000	360	14.70×10^-3	5.01

*Torsional stiffness values given are calculated for the element alone. *The moment of inertia and mass are measured for the maximum bore diameter.

[Dimensions] - Wedge Coupling

Unit [mm]

Model	d1[mm]	d2[mm]	D[mm]	L[mm]	N1･N2[mm]	LF[mm]	S[mm]	C[mm]	K[mm]	H[mm]	M1 Quantity -Nominal dia.	M1 Tightening torque [N･m]	M2 Quantity -Nominal dia.
Model	d1[mm]	d2[mm]	D[mm]	L[mm]	N1･N2[mm]	LF[mm]	S[mm]	C[mm]	K[mm]	H[mm]	M1 Quantity -Nominal dia.	M1 Tightening torque [N･m]	M2 Quantity -Nominal dia.	SFM-070SS-□K-□K-100N	18･19	18･19	68	62.9	53	23.5	5.9	5	38	3-5.1	6-M6	10	3-M6
20･22･24･25	20･22･24･25	58
28･30	28･30	63
32･35	32･35	68
SFM-080SS-□K-□K-150N	22･24･25	22･24･25	78	69.3	58	25.5	8.3	5	37	4-5.1	4-M6	10	2-M6
	28･30	28･30			63
	32･35	32･35			68
	-	38			73
SFM-080SS-□K-□K-200N	22･24･25	22･24･25	78	68.7	58	25.5	7.7	5	42	3-5.1	6-M6	10	3-M6
	28･30	28･30			63
	32･35	32･35			68
	38	38			73
SFM-090SS-□K-□K-300N	28･30	28･30	88	69.3	63	25.5	8.3	5	50	3-6.8	6-M6	10	3-M6
	32･35	32･35			68
	38･40･42	38･40･42			73
	45	45			78
	48	48			83
SFM-100SS-□K-□K-450N	32･35	32･35	98	75.2	68	27.5	10.2	5	56	3-6.8	6-M6	10	3-M6
	38･40･42	38･40･42			73
	45	45			78
	48･50	48･50			83
SFM-120SS-□K-□K-600N	35	35	118	75.2	68	27.5	10.2	5	68	3-6.8	6-M6	10	3-M6
	38･40･42	38･40･42			73
	45	45			78
	48･50･52	48･50･52			83
	55	55			88
	60･62･65	60･62･65			98
	-	70			108
SFM-140SS-□K-□K-800N	35･38	35･38	138	94.6	83	36.5	10.6	5.5	78	3-8.6	6-M8	24	3-M8
	40･42･45	40･42･45			88
	-	48･50･52			98
		55･60			108
		62･65･70			118
		75･80			128
SFM-140SS-□K-□K-1000N	48･50･52	48･50･52	138	94.6	98	36.5	10.6	5.5	78	3-8.6	6-M8	24	3-M8
	55･60	55･60			108
	62･65･70	62･65･70			118
	75	75･80			128

* The nominal diameters of the pressure bolt M1 and detachment screw hole M2 are equal to the quantity minus the nominal diameter of the screw threads. The quantities of H, M1 and M2 are the same as the quantity for a hub on one side.

[Standard Bore Diameter] - Wedge Coupling

Model	Standard bore diameter d1･d2[mm]
Model	Nominal diameter	18	19	20	22	24	25	28	30	32	35	38	40	42	45	48	50	52	55	60	62	65	70	75	80
SFM-070SS-□K-□K-100N	d1	●	●	●	●	●	●	●	●	●	●
SFM-070SS-□K-□K-100N	d2	●	●	●	●	●	●	●	●	●	●
SFM-080SS-□K-□K-150N	d1				●	●	●	●	●	●	●
SFM-080SS-□K-□K-150N	d2				●	●	●	●	●	●	●	●
SFM-080SS-□K-□K-200N	d1				●	●	●	●	●	●	●	●
SFM-080SS-□K-□K-200N	d2				●	●	●	●	●	●	●	●
SFM-090SS-□K-□K-300N	d1							●	●	●	●	●	●	●	●	●
SFM-090SS-□K-□K-300N	d2							●	●	●	●	●	●	●	●	●
SFM-100SS-□K-□K-450N	d1									●	●	●	●	●	●	●	●
SFM-100SS-□K-□K-450N	d2									●	●	●	●	●	●	●	●
SFM-120SS-□K-□K-600N	d1										●	●	●	●	●	●	●	●	●	●	●	●
SFM-120SS-□K-□K-600N	d2										●	●	●	●	●	●	●	●	●	●	●	●	●
SFM-140SS-□K-□K-800N	d1										●	●	●	●	●
SFM-140SS-□K-□K-800N	d2										●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SFM-140SS-□K-□K-1000N	d1															●	●	●	●	●	●	●	●	●
SFM-140SS-□K-□K-1000N	d2															●	●	●	●	●	●	●	●	●	●

* The bore diameters marked with ● are supported as standard bore diameter.

[Balance correction] - Wedge Coupling

Model（Size）	Balance classification	Supported rotational speed[min^-1]
Model（Size）	Balance classification	10000 or less	15000 or less	18000 or less	20000 or less	24000 or less
SFM-070SS	G6.3・G2.5	●	●	●	●	●
SFM-080SS	G6.3・G2.5	●	●	●	●	●
SFM-090SS	G6.3・G2.5	●	●	●	●	●
SFM-100SS	G6.3・G2.5	●	●	●	●
SFM-120SS	G6.3・G2.5	●	●	●	●
SFM-140SS	G6.3・G2.5	●	●	●	●

* We will perform balance correction for supported rotational speeds marked with ● .

SFM Models

Maximum rotation speed 20000 min ^{- 1}

High-precision mounting

Low noise

Supports wide range of shaft dimensional tolerances

Balancing is available

SFM Model

Lineup

SFM (SS)

SFM (DS)

Maximum rotation speed 20000 min - 1

High-precision mounting

Low noise

Supports wide range of shaft dimensional tolerances

Balancing is available

Maximum rotation speed 20000 min ^{- 1}