Bellows Flexible Coupling

MKM-AC Adapter + Clamp Type

Merits

High Torque, High Torsional Stiffness, High Response
Zero Backlash

Bellows type flexible coupling for high torque applications
Spring action bellows configuration absorbs parallel, angular misalignments and shaft end-play
Constant velocity even under misalignment
Identical clockwise and counter-clockwise rotational characteristics
Finished products featuring two different end bore diameters available in stock
Can be applied to tapered shafts of servomotors

Application

Servomotor	A
Stepping Motor	A
General-Purpose Motor	-
Encoder	-

Special Characteristics

Zero Backlash	A
High Torsional Stiffness	A
High Torque	A
Allowable Misalignment	B
Vibration Absorption	-
Electrical Insulation	-
Corrosion Resistant (All Stainless Steel)	-

A : Excellent B : Very Good

Eccentric Reaction Force / Thrust Reaction Force / Changes in Static Torsional Stiffness Caused by Temperature / Slip Torque [PDF 153KB]

Configuration & Material

Dimensions

unit:mm
Catalog Number	A	B	L	W	E	F	G	M	D₃	C	S	T	H	Wrench Torque (N·m)
MKM-56AC	56	56	20	70	38	7.5	19	M6	16	20	16	4	16	14	MKM56AC.dxf	MKM56AC
MKM-56AC-H	56	56	20	70	38	7.5	19	M6	24	30	29	6	27	14	MKM56ACH.dxf	MKM56ACH
MKM-63AC	63	66	22	77	47	8.5	22	M8	24	30	29	6	27	30	MKM63AC.dxf	MKM63AC

Stock Bore Diameters D1	Keyways
	b		k
	Basic Size	Tolerance (JS9)	Basic Size	Tolerance
11T	4	±0.015	12.7	+0.1 0
16T	5	±0.015	18.3	+0.2 0

Specifications

Catalog Number	Max. Bore (mm)	Rated Torque (N·m)	Max. Torque (N·m)	Max. Rotational Frequency (min^-1)	Moment of Inertia^* (kg·m²)	Static Torsional Stiffness (N·m/rad)	Errors of Eccentricity (mm)	Errors of Angularity (°)	Errors of Shaft End-Play (mm)	Mass^* (g)
MKM-56AC	30	20	40	10000	1.3x10^-4	18000	0.2	2	±0.8	250
MKM-56AC-H	30	35	70	10000	1.4x10^-4	22000	0.2	2	±0.8	270
MKM-63AC	34	60	120	8000	2.5x10^-4	33000	0.2	2	±0.9	370

*Adjustment of rated and maximum torque specifications for load fluctuations is not required.
For more detailed information, please refer to Selection Guidelines [PDF 171KB].
**Moment of inertia and mass figures based on maximum bore dimensions.

Stock Bores

Catalog Number	RoHS	Stock Bores D₁·D₂
MKM-56AC	Compliant
MKM-56AC-H	Compliant
MKM-63AC	Compliant

●All products come with cap screws.
●Recommended tolerance for shaft diameters is h6 and h7.
●Bore and keyway modifications are available on request. Please contact the customer service center for more information.