Multiple Disc Brake

MDB Series

Multiple Disc Brake

  • Wet Static Torque – 12 to 759 lb-ft
  • Wet Starting Torque – 7 to 449 lb-ft
  • Dry Static Torque – 13 to 882 lb-ft
  • Dry Starting Torque – 10 to 673 lb-ft
  • Max Speed- 1750 to 4200 rpm
  • Nine standard frame sizes
  • Overall Length – 1.7″ to 3.9″
  • Bushing Bore – .9″ to 2.9″
Performance / Mechanical Specifications MDB Series — Model Size
395 435 475 520 580 640 720 795 925
Torque Rating (Static-Wet) lb-ft
Model: 395
12
Model: 435
23
Model: 475
46
Model: 520
75
Model: 580
117
Model: 640
187
Model: 720
300
Model: 795
505
Model: 925
795
(Nm)
Model: 395
(16.2)
Model: 435
(31.2)
Model: 475
(62.4)
Model: 520
(101.7)
Model: 580
(158.6)
Model: 640
(253.5)
Model: 720
(406.7)
Model: 795
(684.7)
Model: 925
(1077.9)
Torque Starting (Wet) lb-ft
Model: 395
7
Model: 435
12
Model: 475
25
Model: 520
42
Model: 580
65
Model: 640
107
Model: 720
168
Model: 795
281
Model: 925
449
(Nm)
Model: 395
(9.5)
Model: 435
(16.2)
Model: 475
(33.9)
Model: 520
(56.9)
Model: 580
(88.1)
Model: 640
(145.1)
Model: 720
(227.8)
Model: 795
(381.0)
Model: 925
(608.8)
Torque Rating (Static-Dry) lb-ft
Model: 395
13
Model: 435
25
Model: 475
52
Model: 520
84
Model: 580
130
Model: 640
208
Model: 720
332
Model: 795
561
Model: 925
882
(Nm)
Model: 395
(17.6)
Model: 435
(33.9)
Model: 475
(70.5)
Model: 520
(113.9)
Model: 580
(176.3)
Model: 640
(282)
Model: 720
(450.1)
Model: 795
(760.6)
Model: 925
(1195.8)
Torque Starting (Dry) lb-ft
Model: 395
10
Model: 435
19
Model: 475
39
Model: 520
63
Model: 580
98
Model: 640
161
Model: 720
253
Model: 795
421
Model: 925
673
(Nm)
Model: 395
(13.6)
Model: 435
(25.8)
Model: 475
(52.9)
Model: 520
(85.4)
Model: 580
(132.9)
Model: 640
(218.3)
Model: 720
(342)
Model: 795
(570.8)
Model: 925
(912.5)
Max Speed rpm
Model: 395
4200
Model: 435
4000
Model: 475
3500
Model: 520
3200
Model: 580
3000
Model: 640
2500
Model: 720
2200
Model: 795
2000
Model: 925
1750
Overall Length (ref) in
Model: 395
1.77
Model: 435
1.88
Model: 475
2.04
Model: 520
2.16
Model: 580
2.28
Model: 640
2.44
Model: 720
2.67
Model: 795
2.99
Model: 925
3.38
(mm)
Model: 395
(44.9)
Model: 435
(47.7)
Model: 475
(51.8)
Model: 520
(54.8)
Model: 580
(57.9)
Model: 640
(62)
Model: 720
(67.8)
Model: 795
(75.9)
Model: 925
(85.8)
Spider Bore (max.) in
Model: 395
2.75
Model: 435
2.95
Model: 475
3.34
Model: 520
3.54
Model: 580
4.13
Model: 640
4.52
Model: 720
5.31
Model: 795
5.9
Model: 925
6.88
(mm)
Model: 395
(69.8)
Model: 435
(74.9)
Model: 475
(84.8)
Model: 520
(89.9)
Model: 580
(104.9)
Model: 640
(114.8)
Model: 720
(134.9)
Model: 795
(149.9)
Model: 925
(174.7)
Bushing Bore in
Model: 395
0.906
Model: 435
1.156
Model: 475
1.281
Model: 520
1.469
Model: 580
1.719
Model: 640
1.906
Model: 720
2.219
Model: 795
2.513
Model: 925
2.906
(mm)
Model: 395
(23)
Model: 435
(29.4)
Model: 475
(32.5)
Model: 520
(37.3)
Model: 580
(43.7)
Model: 640
(48.4)
Model: 720
(56.4)
Model: 795
(63.8)
Model: 925
(73.8)
Pilot Diameter (max.) in
Model: 395
1.375
Model: 435
1.625
Model: 475
1.875
Model: 520
2.00
Model: 580
2.5
Model: 640
2.625
Model: 720
2.875
Model: 795
3.25
Model: 925
3.625
(mm)
Model: 395
(34.9)
Model: 435
(41.3)
Model: 475
(47.6)
Model: 520
(50.8)
Model: 580
(63.5)
Model: 640
(66.7)
Model: 720
(73.1)
Model: 795
(82.6)
Model: 925
(92.1)
STP File Model
Model: 395
3D
Model: 435
3D
Model: 475
3D
Model: 520
3D
Model: 580
3D
Model: 640
3D
Model: 720
3D
Model: 795
3D
Model: 925
3D

MDB Operation

This SEPAC multiple disc brake is designed to operate both dry and in oil. The magnet body is secured to a wall or can be shaft mounted with torque arm. 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 magnet body face. This causes the outer discs to be squeezed between the inner discs and the drag created stops the load.