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SFDC Product Line

SFDC Product Line

SFDC Product Line

  • Wet Static Torque – 11 to 722 lb-ft
  • Wet Starting Torque – 6 to 408 lb-ft
  • Dry Static Torque – 12 to 802 lb-ft
  • Dry Starting Torque – 9 to 612 lb-ft
  • Max Speed – 1750 to 4200 rpm
  • Nine standard frame sizes
  • Overall Length – 2.6″ to 5.4″
  • Overall Dia. – 3.9″ to 9.2″
  • Rotor Bore – .8″ to 2.8″
Performance / Mechanical Specifications SFDC Series — Model Size
SFDC - 395 SFDC - 435 SFDC - 475 SFDC - 520 SFDC - 580 SFDC - 640 SFDC - 720 SFDC - 795 SFDC - 925
Torque Static (Wet) lb-ft 11 21 42 68 106 170 272 459 722
Torque Starting (Wet) lb-ft 6 11 23 38 59 97 153 255 408
Torque Static (Dry) lb-ft 12 23 47 76 118 189 302 510 802
Torque Starting (Dry) lb-ft 9 17 35 57 89 146 230 383 612
Max Speed rpm 4200 4000 3500 3200 3000 2500 2200 2000 1750
Overall Diameter in 3.93 4.33 4.72 5.19 5.78 6.37 7.16 7.95 9.25
Overall Length (ref) in 2.56 2.75 3.06 3.37 3.56 3.75 4.16 4.75 5.44
Rotor Bore (max.) in 0.875 1.125 1.25 1.5 1.687 1.875 2 2.25 2.875

SFDC Operation

This SEPAC stationary field multiple disc clutch is designed to operate both dry and in oil. Bearings used are sealed and permanently lubricated, and do not require a grease fitting like some competitive clutches. Many options are available.

When current is applied to the coil in the magnet body, a magnetic field is created which attracts the armature toward the rotor face. This causes the outer disc to be squeezed between the inner discs and the torque is transmitted from the input (rotor) to the output (spider). The magnet body is held stationary by means of an anti-rotation hole as specified by the customer.

Stationary Field Multiple Friction Disc Clutch (SFDC) 2D Drawing