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Metal Disc Couplings

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Servo Flex Line-up

Metal Disc Couplings

Miki Pulley developed the Servo-Flex line of couplings to fulfill the high performance required by servo motor applications.   The flexible metal disc elements allow for varying degrees of misalignment, while offering superior torsional rigidity.  Through finite element analysis in the rigorous research and development phase, Miki Pulley engineers designed the optimal size and shape of the leaf spring element.  We offer an extensive line-up of metal disc couplings that may be applied to a wide range of demanding applications. Contact Miki Pulley to learn more!

Common industry uses include:  machine tools, semiconductor manufacturing, actuators, surface chip mounting, printing machines, and packaging equipment.

Additional attributes:

  • Ultra low inertia
  • Simple yet reliable design with zero backlash
  • Dampens conductive heat transfer from motor to output shaft
  • Mounting styles available in: clamp, taper-lock, and keyed shaft

SFC Model SFF(N) Model SFS Model
SFF Model
SFM Model
SFH Model
SFC
coupling
SFF(N)
coupling
SFS
coupling
SFF
coupling
SFM
coupling
SFH
coupling

SFC coupling

SFC Model:
The SFC model utilizes metal plate springs to offer high torsional stiffness, while forgiving a degree of misalignment. Using aluminum clad in a clear anodized finish, the SFC performs with low inertia given its torsional stiffness and strength. The flexible element gap also dampens conductive heat transfer from motor to output shaft.

Single and double element configurations are available. Bores can be configured with clamp, taper-lock, or keyed styles.

  • Maximum allowable torque: 184.39 ft-lbs (250Nm)
  • Bore size range: 0.118” - 1.772” (3mm ~ 45mm)
  • Backlash: Zero
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SFF(N) coupling

SFF-(N) Model:
The additional plate spring connection bolts on the SFF-(N) model provides higher torsional stiffness, while accepting limited misalignment. Using high grade steel clad in a black oxide finish, the SFF-(N) offers exceptional torsional stiffness and strength. The flexible element gap also dampens conductive heat transfer from motor to output shaft.

Single and double element configurations are available. Bores can be configured with clamp, taper-lock, or keyed styles.

  • Maximum allowable torque: 221.27 ft-lbs (300Nm)
  • Bore size range: 0.315” - 1.654” (8mm ~ 42mm)
  • Backlash: Zero
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SFS coupling

SFS Model:
This basic Servo-Flex variant offers more axial flexibility than its counterparts. When paired with a floating shaft spacer, the SFS may transmit torque at a greater DBSE (distance between shaft ends), while absorbing misalignment. Using high grade steel with a black oxide finish, the SFS offers exceptional torsional stiffness and strength. The flexible element gap also dampens conductive heat transfer from the motor to output shaft.

Single and double element configurations are available as-well as varying lengths of an intermediate floating shaft. Bores can be configured with clamp, taper-lock, or keyed styles.

  • Maximum allowable torque: 590.05 ft-lbs (800Nm)
  • Bore size range: 0.315” - 1.654” (8mm ~ 42mm)
  • Backlash: Zero
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SFF coupling

SFF Model:
The SFF coupling is ideal for feed shafts on machine tools due to its high torque rating. With robust steel hubs (in a black oxide finish), the SFF offers exceptional torsional stiffness and strength. This design assures accurate shaft rotation with precise control. The flexible element gap also dampens conductive heat transfer from motor to output shaft.

Single and double element configurations are available. Bores can be arranged with clamp, taper-lock, or keyed styles.

  • Maximum allowable torque: 221.27 ft-lbs (800Nm)
  • Bore size range: 0.709” – 3.15” (18mm ~ 80mm)
  • Backlash: Zero
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SFM coupling

SFM Model:
The SFM coupling was developed in response to demanding spindle tool applications. It can perform at high speeds with precise rotation. The outside profile is free of irregularities that would produce noise during high speed rotation. Also, the SFM offers a centering pressure flange in the bore to ensure concentricity. The double elements offer ultra-high rigidity with limited flexibility.

  • Maximum allowable torque: 221.27 ft-lbs (800Nm)
  • Bore size range: 1.102” – 3.15” (28mm ~ 80mm)
  • Backlash: Zero
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SFH coupling

SFH Model:
With a 5900 ft/lbs (8000 Nm) torque rating, and maximum outer diameter of 10.32” (262mm), the SFH is intended for high power applications in large industrial equipment. 

The metal plate spring and steel hub construction allows for misalignment flexibility while offering rotational rigidity and precision.  Also, it is available in a double-element floating shaft configuration.  Floating shafts are offered in specific sizes, or made to customer length requirements.

  • Maximum allowable torque: 5900.50 ft-lbs (8000Nm)
  • Bore size range: 0.866” – 4.528”   (22mm ~ 115mm)
  • Backlash: Zero
  • RoHS compliant
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