Stationary Field Disc Clutch

SFDC Series

Stationary Field Disc Clutch

  • 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
STP File Model
Model: SFDC - 395
3D
Model: SFDC - 435
3D
Model: SFDC - 475
3D
Model: SFDC - 520
3D
Model: SFDC - 580
3D
Model: SFDC - 640
3D
Model: SFDC - 720
3D
Model: SFDC - 795
3D
Model: SFDC - 925
3D
Torque Static (Wet) lb-ft
Model: SFDC - 395
11
Model: SFDC - 435
21
Model: SFDC - 475
42
Model: SFDC - 520
68
Model: SFDC - 580
106
Model: SFDC - 640
170
Model: SFDC - 720
272
Model: SFDC - 795
459
Model: SFDC - 925
722
(Nm)
Model: SFDC - 395
(14.9)
Model: SFDC - 435
(28.5)
Model: SFDC - 475
(56.9)
Model: SFDC - 520
(92.2)
Model: SFDC - 580
(143.7)
Model: SFDC - 640
(230.5)
Model: SFDC - 720
(368.8)
Model: SFDC - 795
(622.3)
Model: SFDC - 925
(978.9)
Torque Starting (Wet) lb-ft
Model: SFDC - 395
6
Model: SFDC - 435
11
Model: SFDC - 475
23
Model: SFDC - 520
38
Model: SFDC - 580
59
Model: SFDC - 640
97
Model: SFDC - 720
153
Model: SFDC - 795
255
Model: SFDC - 925
408
(Nm)
Model: SFDC - 395
(8.1)
Model: SFDC - 435
(14.9)
Model: SFDC - 475
(31.2)
Model: SFDC - 520
(51.5)
Model: SFDC - 580
(80.0)
Model: SFDC - 640
(131.5)
Model: SFDC - 720
(207.4)
Model: SFDC - 795
(345.7)
Model: SFDC - 925
(533.2)
Torque Static (Dry) lb-ft
Model: SFDC - 395
12
Model: SFDC - 435
23
Model: SFDC - 475
47
Model: SFDC - 520
76
Model: SFDC - 580
118
Model: SFDC - 640
189
Model: SFDC - 720
302
Model: SFDC - 795
510
Model: SFDC - 925
802
(Nm)
Model: SFDC - 395
(16.2)
Model: SFDC - 435
(31.2)
Model: SFDC - 475
(63.7)
Model: SFDC - 520
(103)
Model: SFDC - 580
(160)
Model: SFDC - 640
(256.2)
Model: SFDC - 720
(409.5)
Model: SFDC - 795
(691.5)
Model: SFDC - 925
(1087.4)
Torque Starting (Dry) lb-ft
Model: SFDC - 395
9
Model: SFDC - 435
17
Model: SFDC - 475
35
Model: SFDC - 520
57
Model: SFDC - 580
89
Model: SFDC - 640
146
Model: SFDC - 720
230
Model: SFDC - 795
383
Model: SFDC - 925
612
(Nm)
Model: SFDC - 395
(12.2)
Model: SFDC - 435
(23)
Model: SFDC - 475
(47.4)
Model: SFDC - 520
(77.3)
Model: SFDC - 580
(120.7)
Model: SFDC - 640
(198)
Model: SFDC - 720
(311.8)
Model: SFDC - 795
(519.3)
Model: SFDC - 925
(829.8)
Max Speed rpm
Model: SFDC - 395
4200
Model: SFDC - 435
4000
Model: SFDC - 475
3500
Model: SFDC - 520
3200
Model: SFDC - 580
3000
Model: SFDC - 640
2500
Model: SFDC - 720
2200
Model: SFDC - 795
2000
Model: SFDC - 925
1750
Overall Diameter in
Model: SFDC - 395
3.93
Model: SFDC - 435
4.33
Model: SFDC - 475
4.72
Model: SFDC - 520
5.19
Model: SFDC - 580
5.78
Model: SFDC - 640
6.37
Model: SFDC - 720
7.16
Model: SFDC - 795
7.95
Model: SFDC - 925
9.25
(mm)
Model: SFDC - 395
(99.8)
Model: SFDC - 435
(110)
Model: SFDC - 475
(119.9)
Model: SFDC - 520
(131.8)
Model: SFDC - 580
(146.8)
Model: SFDC - 640
(161.8)
Model: SFDC - 720
(181.9)
Model: SFDC - 795
(201.9)
Model: SFDC - 925
(234.9)
Overall Length (ref) in
Model: SFDC - 395
2.56
Model: SFDC - 435
2.75
Model: SFDC - 475
3.06
Model: SFDC - 520
3.37
Model: SFDC - 580
3.56
Model: SFDC - 640
3.75
Model: SFDC - 720
4.16
Model: SFDC - 795
4.75
Model: SFDC - 925
5.44
(mm)
Model: SFDC - 395
(65)
Model: SFDC - 435
(70)
Model: SFDC - 475
(77.7)
Model: SFDC - 520
(85.6)
Model: SFDC - 580
(90.4)
Model: SFDC - 640
(95.3)
Model: SFDC - 720
(105.7)
Model: SFDC - 795
(120.6)
Model: SFDC - 925
(138.2)
Rotor Bore (max.) in
Model: SFDC - 395
0.875
Model: SFDC - 435
1.125
Model: SFDC - 475
1.25
Model: SFDC - 520
1.5
Model: SFDC - 580
1.687
Model: SFDC - 640
1.875
Model: SFDC - 720
2
Model: SFDC - 795
2.25
Model: SFDC - 925
2.875
(mm)
Model: SFDC - 395
(22.2)
Model: SFDC - 435
(28.6)
Model: SFDC - 475
(31.7)
Model: SFDC - 520
(38.1)
Model: SFDC - 580
(42.8)
Model: SFDC - 640
(47.6)
Model: SFDC - 720
(50.8)
Model: SFDC - 795
(57.2)
Model: SFDC - 925
(73)

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.