Magnetic Disc Brake
Johnson Magnetic Disc Brakes are DC magnet, spring-set / electrically-released disc brakes, available in Service Duty (Type CU) and Emergency Stop Duty (Type CX) versions, plus the General Duty MBC caliper series. Foot-mounted, fabricated steel construction with ground stainless steel pins and high-temperature non-asbestos friction linings.
Applications: Mechanical handling equipment, cranes, winches, conveyors and mills. Emergency stop brakes (CX) are often installed on the flange of a crane winding drum.
Options: Self-adjusting device to compensate for lining wear, limit switches to monitor release/set/wear, special materials and finishes for high-integrity applications such as the nuclear industry. Electrical control units are available for DC or AC supplies, with shunt or series magnets and optional economy circuits to reduce release and set times.
Applications: Cranes, Winches, Skip Hoists, Conveyors, Escalators, Ports, Nuclear, Naval, Steel Mills, Power Generation, Metro
MBC Series — General Duty
MBC brakes are drop-in disc brake replacements for DIN Metric and AISE Imperial drum brakes, matching the same mounting footprint and drum centre height as the equivalent drum brake — for example, an MBC part number referencing a 16” drum brake size will share that unit’s footprint even though the actual disc diameter differs.
Disc Diameter Range: 17–29 in / 432–737 mm
Max Dynamic Torque Range: 700–6,000 lb-ft / 950–8,100 Nm
Max Dynamic Torque: 700 lb-ft / 950 Nm
Weight: 356 lb / 162 kg
DC Coil (Start/Run): 800 W
Pad Total Area: 45 in² / 288 cm²
Full dimensional drawings available on request.
Max Dynamic Torque: 700 lb-ft / 950 Nm
Weight: 356 lb / 162 kg
DC Coil (Start/Run): 800 W
Pad Total Area: 45 in² / 288 cm²
Full dimensional drawings available on request.
Max Dynamic Torque: 1,250 lb-ft / 1,700 Nm
Weight: 540 lb / 245 kg
DC Coil (Start/Run): 1,100 W
Pad Total Area: 75 in² / 420 cm²
Full dimensional drawings available on request.
Max Dynamic Torque: 1,250 lb-ft / 1,700 Nm
Weight: 540 lb / 245 kg
DC Coil (Start/Run): 1,100 W
Pad Total Area: 75 in² / 420 cm²
Full dimensional drawings available on request.
Max Dynamic Torque: 2,650 lb-ft / 3,600 Nm
Weight: 810 lb / 367 kg
DC Coil (Start/Run): 2,700 W
Pad Total Area: 84 in² / 542 cm²
Full dimensional drawings available on request.
Max Dynamic Torque: 2,650 lb-ft / 3,600 Nm
Weight: 810 lb / 367 kg
DC Coil (Start/Run): 2,700 W
Pad Total Area: 84 in² / 542 cm²
Full dimensional drawings available on request.
Max Dynamic Torque: 6,000 lb-ft / 8,100 Nm
Weight: 1,765 lb / 800 kg
DC Coil (Start/Run): 4,600 W
Pad Total Area: 122 in² / 787 cm²
Full dimensional drawings available on request.
Max Dynamic Torque: 6,000 lb-ft / 8,100 Nm
Weight: 1,765 lb / 800 kg
DC Coil (Start/Run): 4,600 W
Pad Total Area: 122 in² / 787 cm²
Full dimensional drawings available on request.
CX Series — Emergency Duty
Min Disc Diameter: 15–39.8 in / 380–1,010 mm
Braking Force: 2,248–30,350 lbf / 10,000–135,000 N
CX brakes are intended for Emergency Duty only. Braking torque depends on disc diameter — see the formula note on each model tab.
Braking Force: 2,248 lbf / 10,000 N
Weight: 196 lb / 89 kg
DC Coil (Start/Run): 2,200 W / 100 W
Total Pad Area: 15.5 in² / 100 cm²
Min Disc Diameter: 15 in / 380 mm
CX Series brakes are intended for Emergency Duty only. Actual braking torque depends on disc diameter — full dimensional drawings available on request.
Braking Force: 4,496 lbf / 20,000 N
Weight: 225 lb / 102 kg
DC Coil (Start/Run): 2,500 W / 120 W
Total Pad Area: 31 in² / 200 cm²
Min Disc Diameter: 17.7 in / 450 mm
CX Series brakes are intended for Emergency Duty only. Actual braking torque depends on disc diameter — full dimensional drawings available on request.
Braking Force: 8,992 lbf / 40,000 N
Weight: 346 lb / 157 kg
DC Coil (Start/Run): 3,800 W / 200 W
Total Pad Area: 46.5 in² / 300 cm²
Min Disc Diameter: 19.7 in / 500 mm
CX Series brakes are intended for Emergency Duty only. Actual braking torque depends on disc diameter — full dimensional drawings available on request.
Braking Force: 13,489 lbf / 60,000 N
Weight: 617 lb / 280 kg
DC Coil (Start/Run): 4,200 W / 230 W
Total Pad Area: 64.3 in² / 415 cm²
Min Disc Diameter: 23.6 in / 600 mm
CX Series brakes are intended for Emergency Duty only. Actual braking torque depends on disc diameter — full dimensional drawings available on request.
Braking Force: 20,233 lbf / 90,000 N
Weight: 970 lb / 440 kg
DC Coil (Start/Run): 5,700 W / 290 W
Total Pad Area: 101 in² / 650 cm²
Min Disc Diameter: 37.8 in / 960 mm
CX Series brakes are intended for Emergency Duty only. Actual braking torque depends on disc diameter — full dimensional drawings available on request.
CU Series — Service Duty
MBC brakes are drop-in disc brake replacements for DIN Metric and AISE Imperial drum brakes, matching the same mounting footprint and drum centre height as the equivalent drum brake — for example, an MBC part number referencing a 16” drum brake size will share that unit’s footprint even though the actual disc diameter differs.
Disc Diameter Range: 9.88–31.50 in / 250–800 mm
Torque Range: 101–7,330 lb-ft / 137–7,330 Nm
CU Series brakes are Spring Applied / DC Magnet Released, intended for Service Duty. Multiple disc-diameter options are available per model.
Minimum Disc Diameter: 9.88 in / 250 mm
Torque: 101 lb-ft / 137 Nm
Shaft Reaction: 332 lbf / 1475 N
Caliper Weight: 66 lb / 30 kg
DC Coil (Inrush/Run): 600/45 W
Braking Force: 324 lbf / 1440 N
Minimum Disc Diameter: 12.38 in / 315 mm
Torque: 137 lb-ft / 186 Nm
Shaft Reaction: 332 lbf / 1475 N
Caliper Weight: 66 lb / 30 kg
DC Coil (Inrush/Run): 600/45 W
Braking Force: 324 lbf / 1440 N
Minimum Disc Diameter: 15.75 in / 400 mm
Torque: 188 lb-ft / 255 Nm
Shaft Reaction: 332 lbf / 1475 N
Caliper Weight: 66 lb / 30 kg
DC Coil (Inrush/Run): 600/45 W
Braking Force: 324 lbf / 1440 N
Minimum Disc Diameter: 12.38 in / 315 mm
Torque: 174 lb-ft / 236 Nm
Shaft Reaction: 431 lbf / 1920 N
Caliper Weight: 110 lb / 50 kg
DC Coil (Inrush/Run): 400/100 W
Braking Force: 413 lbf / 1840 N
Minimum Disc Diameter: 15.75 in / 400 mm
Torque: 229 lb-ft / 316 Nm
Shaft Reaction: 431 lbf / 1920 N
Caliper Weight: 110 lb / 50 kg
DC Coil (Inrush/Run): 400/100 W
Braking Force: 413 lbf / 1840 N
Minimum Disc Diameter: 19.69 in / 500 mm
Torque: 287 lb-ft / 405 Nm
Shaft Reaction: 431 lbf / 1920 N
Caliper Weight: 110 lb / 50 kg
DC Coil (Inrush/Run): 400/100 W
Braking Force: 413 lbf / 1840 N
Minimum Disc Diameter: 12.38 in / 315 mm
Torque: 232 lb-ft / 314 Nm
Shaft Reaction: 573 lbf / 2550 N
Caliper Weight: 110 lb / 50 kg
DC Coil (Inrush/Run): 690/100 W
Braking Force: 550 lbf / 2450 N
Minimum Disc Diameter: 15.75 in / 400 mm
Torque: 311 lb-ft / 421 Nm
Shaft Reaction: 573 lbf / 2550 N
Caliper Weight: 110 lb / 50 kg
DC Coil (Inrush/Run): 690/100 W
Braking Force: 550 lbf / 2450 N
Minimum Disc Diameter: 19.69 in / 500 mm
Torque: 398 lb-ft / 540 Nm
Shaft Reaction: 573 lbf / 2550 N
Caliper Weight: 110 lb / 50 kg
DC Coil (Inrush/Run): 690/100 W
Braking Force: 550 lbf / 2450 N
Minimum Disc Diameter: 15.75 in / 400 mm
Torque: 745 lb-ft / 1010 Nm
Shaft Reaction: 1540 lbf / 6870 N
Caliper Weight: 313 lb / 142 kg
DC Coil (Inrush/Run): 1900/200 W
Braking Force: 1480 lbf / 6570 N
Minimum Disc Diameter: 19.69 in / 500 mm
Torque: 996 lb-ft / 1350 Nm
Shaft Reaction: 1540 lbf / 6870 N
Caliper Weight: 313 lb / 142 kg
DC Coil (Inrush/Run): 1900/200 W
Braking Force: 1480 lbf / 6570 N
Minimum Disc Diameter: 24.81 in / 630 mm
Torque: 1330 lb-ft / 1800 Nm
Shaft Reaction: 1540 lbf / 6870 N
Caliper Weight: 313 lb / 142 kg
DC Coil (Inrush/Run): 1900/200 W
Braking Force: 1480 lbf / 6570 N
Minimum Disc Diameter: 27.94 in / 710 mm
Torque: 1520 lb-ft / 2060 Nm
Shaft Reaction: 1540 lbf / 6870 N
Caliper Weight: 313 lb / 142 kg
DC Coil (Inrush/Run): 1900/200 W
Braking Force: 1480 lbf / 6570 N
Minimum Disc Diameter: 19.69 in / 500 mm
Torque: 2120 lb-ft / 2870 Nm
Shaft Reaction: 3575 lbf / 15900 N
Caliper Weight: 507 lb / 230 kg
DC Coil (Inrush/Run): 2500/390 W
Braking Force: 3410 lbf / 15150 N
Minimum Disc Diameter: 24.81 in / 630 mm
Torque: 2840 lb-ft / 3850 Nm
Shaft Reaction: 3575 lbf / 15900 N
Caliper Weight: 507 lb / 230 kg
DC Coil (Inrush/Run): 2500/390 W
Braking Force: 3410 lbf / 15150 N
Minimum Disc Diameter: 27.94 in / 710 mm
Torque: 3290 lb-ft / 4460 Nm
Shaft Reaction: 3575 lbf / 15900 N
Caliper Weight: 507 lb / 230 kg
DC Coil (Inrush/Run): 2500/390 W
Braking Force: 3410 lbf / 15150 N
Minimum Disc Diameter: 31.50 in / 800 mm
Torque: 3790 lb-ft / 5140 Nm
Shaft Reaction: 3575 lbf / 15900 N
Caliper Weight: 507 lb / 230 kg
DC Coil (Inrush/Run): 2500/390 W
Braking Force: 3410 lbf / 15150 N
Minimum Disc Diameter: 24.81 in / 630 mm
Torque: 4050 lb-ft / 5500 Nm
Shaft Reaction: 5080 lbf / 22600 N
Caliper Weight: 645 lb / 292 kg
DC Coil (Inrush/Run): 2950/460 W
Braking Force: 4860 lbf / 21600 N
Minimum Disc Diameter: 27.94 in / 710 mm
Torque: 4690 lb-ft / 6360 Nm
Shaft Reaction: 5080 lbf / 22600 N
Caliper Weight: 645 lb / 292 kg
DC Coil (Inrush/Run): 2950/460 W
Braking Force: 4860 lbf / 21600 N
Minimum Disc Diameter: 31.50 in / 800 mm
Torque: 5400 lb-ft / 7330 Nm
Shaft Reaction: 5080 lbf / 22600 N
Caliper Weight: 645 lb / 292 kg
DC Coil (Inrush/Run): 2950/460 W
Braking Force: 4860 lbf / 21600 N