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MH Series Aluminum Plum Flexible Shaft Coupling

Home · Products · Coupling / Nut Housing · MH Series Aluminum Plum Flexible Shaft Coupling
  • MH series aluminum plum flexible shaft coupling with red elastomer spider, used for torque transmission and shaft misalignment compensation in servo motors, CNC machinery and automation equipment.
MH series aluminum plum flexible shaft coupling with red elastomer spider, used for torque transmission and shaft misalignment compensation in servo motors, CNC machinery and automation equipment.

MH Series Aluminum Plum Flexible Shaft Coupling

The MH Series Plum Flexible Shaft Coupling features a main body precisely machined from high-strength aluminum alloy, with a polyurethane (PU) plum-shaped elastic pad embedded in the center. It utilizes the compressive deformation of the elastomer to compensate for radial, angular, and axial deviations between the two shafts, and to buffer impact loads. Its simple structure, maintenance-free operation, and ease of installation make it widely used in precision transmission connections such as servo motors, stepper motors, ball screws, and encoders.

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Technology

The core value of the MH Series Plum Flexible Shaft Coupling lies in its excellent overall performance and high cost-effectiveness. The following is a comparison with common couplings.

Performance Dimensions MH Series Aluminium Star Couplings Rigid coupling Metal diaphragm couplings
Core Functions Compensates for misalignment, dampens vibrations and provides electrical insulation; suitable for general-precision power transmission. Rigid connection, zero backlash, requiring extremely high alignment accuracy. High torque, zero backlash, high-precision misalignment compensation.
Deviation Compensation Capability Excellent. Can simultaneously compensate for radial, angular and axial misalignment. No compensation; installation errors will result in damage to bearings and shafts. Excellent. Particularly effective at compensating for large angular and axial misalignments.
Torsional Rigidity Moderate, with elasticity. Can filter out some vibrations and shocks, but has a slight torsional backlash. Extremely high, absolute rigidity. Extremely high, with zero backlash.
Shock Absorption and Vibration Damping Good. The elastomer effectively absorbs vibration and shock loads, protecting the equipment at both ends. None; vibrations are transmitted directly. Average. Relying primarily on the deformation of the metal diaphragm for compensation, with limited shock-absorbing capability.
Electrical Insulation Yes. The polyurethane elastomer offers good insulation properties and blocks shaft currents. No. Usually not (metal connection).
Maintenance and Costs Maintenance-free and low-cost; only the shims need to be replaced when the elastomer wears out. Maintenance-free, low cost. Maintenance-free, high cost.

Main Technical Parameters and Selection

Structure and Material:
Main body: 6061-T6 aluminum alloy, lightweight and sufficiently strong.
Elastomer: Polyurethane (PU) plum-shaped pad, available in various hardnesses (e.g., Shore A 92°, 98°). Higher hardness results in greater torque transmission but slightly reduced compensation capability.

Key Performance Parameters:
Rated torque: Covers a wide range from a few tenths of a Newton-meter to hundreds of Newton-meters.
Maximum speed: Usually high, meeting the speed requirements of most servo motors.
Compensation capability: Radial deviation typically ≤0.2mm, angular deviation ≤1°, axial deviation ±0.5mm (specific values ​​depend on the model).
Mounting methods: Provides two main methods: set screw fixing (clamping type) and flange + keyway fixing. The clamping type is more commonly used, offering easy installation and no backlash.
Selection points: Selection is mainly based on the driving side torque (considering the safety factor), the deviation between the two shafts, bore and keyway dimensions, and space limitations.

Applications
Due to its excellent overall performance and cost-effectiveness, the MH Series Plum Flexible Shaft Coupling is suitable for almost all general industrial automation fields:
CNC machine tools and laser equipment: Connecting servo motors and ball screws.
Packaging and printing machinery: Transmission connection of conveyor rollers and printing rollers.
Textile and food machinery: Light-load transmission requiring buffering and deviation compensation.
Robots and automated production lines: Joint drives, conveyor belt drives, etc.
Connection of encoders and sensors: Utilizing its insulation and low inertia characteristics. The MH Series Plum Flexible Shaft Coupling is a versatile and all-around performer in automated transmission design. With its simple structure, reliable function, and economical cost, it solves the problems of shaft connection, misalignment compensation, and vibration isolation in most applications. Choosing the MH series means you are selecting a reliable, worry-free, and cost-effective connection solution for your equipment, providing a fundamental component for stable operation.

Parameters

Model No.

d1/d2

pore size

 D
(mm)		 L
(mm)		 L1
(mm)		 L2
(mm)		 L3
(mm)		 S
(mm)		 Screw size
M		 Tightening torque
(N·m)		 Rated torque
(N·m)		 Maximum torque
(N·m)		 Maximum speed
(RPM)		 Moment of inertia
(kg·m²)		 Static torsional stiffness
(N·m/rad)		 Permissible eccentricity
(mm)		 Permissible deviation
(°)		 Axial runout
(mm)
Min Max
MH-D14L22 3 6.35 14 22 6.5 9 3 3.5 M2.5 1 1.5 3 19000 1.0*10-7 46 0.02 1 ±0.6
MH-D20L30 3  10  20  30  10  10  3.5  6.5  M3 1.5  2.8  5.6  17000  1.0*10-6 55  0.02  1  ±0.6
MH-D25L30 4  12  25  30  10  10  5  5  M3 1.5  6  12  16000  5.2*10-6 63  0.02  1  ±0.6
MH-D25L35 4  12  25  35  12.5  10  5  7.5  M3 1.5  6  12  16000  5.2*10-6 63  0.02  1  ±0.6
MH-D30L35 5  16  30  35  11.5  12  5  6.5  M4 2.5  6.5  13  15000  6.2*10-6 72  0.02  1  ±0.6
MH-D30L42 5  16  30  42  15  12  5  10  M4 2.5  6.5  13  15000  6.2*10-6 72  0.02  1  ±0.6
MH-D30L50 5  16  30  50  20  12  5  15  M4 2.5  6.5  13  15000  6.2*10-6 72  0.02  1  ±0.6
MH-D35L50 5  19  35  50  19  12  5  14  M4 2.5  15  30  14000  8.1*10-6 200  0.02  1  ±0.6
MH-D40L40 5  20  40  40  13  14  5  8  M4 2.5  32  64  13000  8.1*10-6 260  0.02  1  ±0.6
MH-D40L50 5  22  40  50  16.5  14  8  8.5  M5 5  32  64  13000  3.8*10-5 450  0.02  1  ±0.6
MH-D40L55 5  22  40  55  19.5  14  9  10.5  M6 8  32  64  13000  3.8*10-5 500  0.02  1  ±0.6
MH-D40L66 5  22  40  66  26  14  9  17  M6 8  32  64  13000  3.8*10-5 550  0.02  1  ±0.6
MH-D40L75 5  22  40  75  26  14  9  24  M6 8  32  64  13000  3.8*10-5 600  0.02  1  ±0.6
MH-D40L85 5  22  40  85  35  15  9  24  M6 8  32  64  13000  3.9*10-5 650  0.02  1  ±0.6
MH-D45L55 6  25  45  55  20.5  14  9  11.5  M6 8  40  80  12000  5.9*10-5 750  0.02  1  ±0.6
MH-D45L66 6  25  45  66  26  14  9  17  M6 8  40  80  12000  5.9*10-5 800  0.02  1  ±0.6
MH-D45L75 6  25  45  75  26  14  9  26  M6 8  40  80  12000  6.9*10-5 825  0.02  1  ±0.6
MH-D45L80 6  25  45  80  32.5  15  9  23.5  M6 8  40  80  12000  6.9*10-5 850  0.02  1  ±0.6
MH-D45L85 6  25  45  85  35  15  9  26  M6 8  40  80  12000  6.9*10-5 850  0.02  1  ±0.6
MH-D55L66 8  30  55  66  25  16  13  12  M8 8  46  92  10500  1.8*10-3 1400  0.02  1  ±0.6
MH-D55L78 8  30  55  78  31  16  13  18  M8 20  46  92  10500  1.8*10-3 1500  0.02  1  ±0.6
MH-D55L95 8  30  55  95  31  16  13  33.5  M8 20  46  92  10500  1.8*10-3 1550  0.02  1  ±0.6
MH-D55L110 8  30  55  110  46.5  17  13  33.5  M8 20  46  92  10500  2.0*10-3 1600  0.02  1  ±0.6
MH-D65L80 10  38  65  80  31.5  17  13  18.5  M8 20  110  220  8300  3.8*10-3 2600  0.02  1  ±0.6
MH-D65L90 10  38  65  90  36.5  17  13  23.5  M8 20  110  220  8300  3.8*10-3 2800  0.02  1  ±0.6
MH-D65L110 10  38  65  110  46.5  17  13  33.5  M8 20  110  220  8300  2.0*10-3 3000  0.02  1  ±0.6
MH-D65L130 10  38  65  130  56.5  17  13  43.5  M8 20  110  220  8300  2.0*10-3 3200  0.02  1  ±0.6
MH-D80L90 14  45  80  90  35  20  15  20  M10 40  135  270  7000  1.8*10-3 3200  0.02  1  ±0.6
MH-D80L114 14  45  80  114  47  20  15  32  M10 40  135  270  7000  1.8*10-3 3500  0.02  1  ±0.6
MH-D80L130 14  45  80  130  55  20  15  32  M10 40  135  270  7000  1.8*10-3 3500  0.02  1  ±0.6
MH-D95L126 16  55  95  126  52  22  20  32  M12 75  260  520  6000  3.2*10-3 4600  0.02  1  ±0.6
MH-D95L150 16  55  95  150  64  22  20  44  M12 75  260  520  6000  3.2*10-3 4600  0.02  1  ±0.6
MH-D105L140 19  65  105  140  58.5  23  20  38.5  M12 75  430  860  5500  4.5*10-3 5800  0.02  1  ±0.6

Drawings

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