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Multiple Disc Electric Clutches (EMA) Specifications

Advantages

  • Highest torque in the smallest space
  • Exclusive floating disc pacs for lowest drag, consistent release
  • Stationary field eliminates brushes & rings
  • Computer designed magnetic flux circuits
  • Complete, compact, self-contained unit

Operation

  • Through-the-disc magnetic flux path
  • Self adjusting for wear
  • Positive engagement / disengagement possible at any speed
  • Operate in oil or dry applications
electric clutch diagram

Specifications / Dimensions - EMA Electric Clutches

Model Dyn. Torque (lb. ft.) St. Torque (lb. ft.)
A
B
C		 Min. Position
D		 Bores Keyway Watts
EMA-0265 8 15 2.625 2.156 2.781 .188 1/2 or 5/8 1/8 x 1/16 40
EMA-0325 8 15 2.266 2.344 3.516 .25 1/2 or 5/8 1/8 x 1/16 40
EMA-0375 15 30 3.797 2.563 4.047 .25 3/4 or 7/8 3/16 x 3/32 40
EMA-0425 35 70 4.359 2.75 4.625 .25 1 or 1 1/8 3/16 x 3/32 40
EMA-0475 75 150 4.828 3.063 5.188 .313 1 1/4 or 1 3/8 1/4 x 1/8 50
EMA-0625 150 300 6.359 3.625 6.75 .375 1 3/4 or 1 7/8 3/8 x 3/16 50
EMA-0800 300 600 8.094 4.063 8.5 .375 2 or 2 1/4 7/16 x 7/32 80
EMA-0950 600 1200 9.641 4.438 10.063 .375 2 3/4 or 3 9/16 x 9/32 90
EMA-1150 1200 2400 11.5 5.063 11.813 .375 3 1/4 or 3 1/2 3/4 x 3/8 100

All models offer 100 or 24 D.C. volts. All Fail-Safe Coils will operate at rated voltage ± 10%.
Standard lead length is 73", special voltage available. Dyn = Dynamic. St = Static. Model refers to clutch size.

Flange Diagram of EMA Electric Clutches
Internal Flange
Drive Cup # A B (b.c.) Screw Size Holes C D E F Slots
EMA-0265-106-30 2.787 - 2.785 1.880 - 1.870 10 3 1.377 - 1.375 2.625 .989 .188 8
EMA-0325-106-30 3.526 - 3.560 2.567 - 2.557 1/4 3 1.877 - 1.875 3.5 1.063 .188 8
EMA-0375-106-30 4.250 - 4.248 3.067 - 3.057 1/4 3 2.017 - 2.015 4.188 1.188 .188 8
EMA-0425-106-30 4.750 - 4.748 3.630 - 3.620 1/4 3 2.517 - 2.515 4.688 1.25 .188 8
EMA-0475-106-30 5.520 - 5.248 3.932 - 3.932 5/16 3 2.517 - 2.515 5.188 1.375 .25 8
EMA-0625-106-30 6.812 - 6.810 5.317 - 5.307 3/8 4 3.767 - 3.765 6.75 1.656 .313 8
EMA-0800-106-30 8.562 - 8.560 6.255 - 6.245 1/2 4 4.517 - 4.515 8.5 1.703 .313 12
EMA-0950-106-30 10.062 - 10.060 8.067 - 8.057 1/2 4 5.517 - 5.515 10 1.781 .313 12
EMA-1150-106-30 11.812 - 11.809 9.817 - 9.807 1/2 6 8.017 - 8.015 11.75 2 .313 12

External Flange
Drive Cup # A B (b.c.) Screw Size Holes C D E F Slots
EMA-0325-106-20 4.625 - 4.623 4.130 - 4.120 1/4 3 3.300 - 3.298 3.5 1.063 .25 8
EMA-0375-106-20 5.625 - 5.623 4.880 - 4.870 1/4 3 3.814 - 3.812 4.188 1.188 .25 8
EMA-0425-106-20 6.125 - 6.123 5.380 - 5.370 1/4 4 4.314 - 4.312 4.688 1.25 .25 8
EMA-0475-106-20 6.875 - 6.873 6.005 - 5.995 5/16 4 4.814 - 4.812 5.188 1.375 .25 8
EMA-0625-106-20 8.500 - 8.498 7.692 - 7.682 3/8 4 6.377 - 6.375 6.75 1.656 .313 12
EMA-0800-106-20 10.625 - 10.623 9.630 - 9.620 1/2 4 8.095 - 8.093 8.5 1.781 .313 12
EMA-0950-106-20 12.250 - 12.249 11.130 - 11.120 1/2 4 9.533 - 9.531 10 1.781 .313 12
EMA-1150-106-20 14.250 - 14.247 13.005 - 12.995 1/2 6 11.253 - 11.250 11.75 2 .375 12

In addition to our standard Multiple Disc Electric Clutches, our engineering department can custom design and manufacture a new component to meet your specific requirements. If you have further questions or would like to discuss your specific needs, please contact us.


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