Stationary Field Tooth Clutches

SFTC Series

Stationary Field Tooth Clutches

  • 3 to 10.5” diameter; 2 to 7.5” length
  • Bore sizes from 0.5 to 4.25”
  • Static torque from 40 to 5200 lb-ft
  • 1400 to 3500 RPM
  • Operates both dry and in oil
  • Modified designs and customized assemblies available
Performance / Mechanical SpecificationsSFTC Series — Model Size
SFTC - 320SFTC - 375SFTC - 450SFTC - 525SFTC - 630SFTC - 760SFTC - 895SFTC - 1065
STP File Model
Model: SFTC - 320
Model: SFTC - 375
Model: SFTC - 450
Model: SFTC - 525
Model: SFTC - 630
Model: SFTC - 760
Model: SFTC - 895
Model: SFTC - 1065
Model:
Torque Rating (Static) lb-ft
Model: SFTC - 320
40
Model: SFTC - 375
80
Model: SFTC - 450
160
Model: SFTC - 525
320
Model: SFTC - 630
650
Model: SFTC - 760
1300
Model: SFTC - 895
2600
Model: SFTC - 1065
5200
Model:
(Nm)
Model: SFTC - 320
(54.2)
Model: SFTC - 375
(108.5)
Model: SFTC - 450
(216.9)
Model: SFTC - 525
(433.9)
Model: SFTC - 630
(881.3)
Model: SFTC - 760
(1762.6)
Model: SFTC - 895
(3525.1)
Model: SFTC - 1065
(7050.2)
Model:
Recommended Max Speed rpm
Model: SFTC - 320
3500
Model: SFTC - 375
3000
Model: SFTC - 450
2500
Model: SFTC - 525
2000
Model: SFTC - 630
1600
Model: SFTC - 760
1500
Model: SFTC - 895
1400
Model: SFTC - 1065
1400
Model:
Body Diameter in
Model: SFTC - 320
3.16
Model: SFTC - 375
3.75
Model: SFTC - 450
4.50
Model: SFTC - 525
5.25
Model: SFTC - 630
6.32
Model: SFTC - 760
7.60
Model: SFTC - 895
8.94
Model: SFTC - 1065
10.65
Model:
(mm)
Model: SFTC - 320
(80.26)
Model: SFTC - 375
(95.25)
Model: SFTC - 450
(114.30)
Model: SFTC - 525
(133.35)
Model: SFTC - 630
(160.53)
Model: SFTC - 760
(193.04)
Model: SFTC - 895
(227.08)
Model: SFTC - 1065
(270.51)
Model:
Overall Length (ref) in
Model: SFTC - 320
2.07
Model: SFTC - 375
2.33
Model: SFTC - 450
2.61
Model: SFTC - 525
2.94
Model: SFTC - 630
3.55
Model: SFTC - 760
4.23
Model: SFTC - 895
5.04
Model: SFTC - 1065
6.18
Model:
(mm)
Model: SFTC - 320
(52.58)
Model: SFTC - 375
(59.18)
Model: SFTC - 450
(66.29)
Model: SFTC - 525
(74.68)
Model: SFTC - 630
(90.17)
Model: SFTC - 760
(107.40)
Model: SFTC - 895
(128.02)
Model: SFTC - 1065
(156.97)
Model:
Rotor Bore – Min in
Model: SFTC - 320
0.500
Model: SFTC - 375
0.750
Model: SFTC - 450
1.000
Model: SFTC - 525
1.125
Model: SFTC - 630
1.375
Model: SFTC - 760
1.750
Model: SFTC - 895
2.250
Model: SFTC - 1065
2.750
Model:
(mm)
Model: SFTC - 320
(12.700)
Model: SFTC - 375
(19.050)
Model: SFTC - 450
(25.400)
Model: SFTC - 525
(28.575)
Model: SFTC - 630
(34.925)
Model: SFTC - 760
(44.450)
Model: SFTC - 895
(57.150)
Model: SFTC - 1065
(69.85)
Model:
Rotor Bore – Max in
Model: SFTC - 320
1.000
Model: SFTC - 375
1.250
Model: SFTC - 450
1.500
Model: SFTC - 525
1.750
Model: SFTC - 630
2.250
Model: SFTC - 760
2.750
Model: SFTC - 895
3.500
Model: SFTC - 1065
4.250
Model:
(mm)
Model: SFTC - 320
(25.400)
Model: SFTC - 375
(31.750)
Model: SFTC - 450
(38.100)
Model: SFTC - 525
(44.450)
Model: SFTC - 630
(57.150)
Model: SFTC - 760
(69.85)
Model: SFTC - 895
(88.900)
Model: SFTC - 1065
(107.95)
Model:

SFTC Operation:

When current is applied to the coil in the stationary magnet body (held from rotating by an anti-rotation pin), a magnetic field is created which attracts the armature toward the rotor. As the teeth engage, torque is transmitted.

When the current is turned off, the armature slides on the splined output plate adapter. Springs pull on the armature to assist disengagement from the rotor.