COMPANY HEADER
WPT® Low Inertia Spring-Set (LISS) Brakes are a spring-applied / air-release design well suited for fail-safe applications. The LI Spring Set can also be used as a parking brake since no pressure is required to engage the brake. With adjustable spring release pressures, the LI Spring-Set can provide a range of torques that will suit many applications. WPT®'s Low Inertia Spring-Set Brakes are available in 1, 2, or 3 plate configurations with sizes ranging 6 through 60 inches.
Request Information
Unit of Measure
Items
Low Inertia Spring-Set Brakes

284 Newton Meter (N·m) Static Torque Rating at 60 Pound Force per Square Inch (lbf/in²) Minimum Release Pressure Low Inertia Spring-Set Brake
Low Inertia Spring-Set Brakes

567 Newton Meter (N·m) Static Torque Rating at 60 Pound Force per Square Inch (lbf/in²) Minimum Release Pressure Low Inertia Spring-Set Brake
Low Inertia Spring-Set Brakes

467 Newton Meter (N·m) Static Torque Rating at 60 Pound Force per Square Inch (lbf/in²) Minimum Release Pressure Low Inertia Spring-Set Brake
Low Inertia Spring-Set Brakes

858 Newton Meter (N·m) Static Torque Rating at 60 Pound Force per Square Inch (lbf/in²) Minimum Release Pressure Low Inertia Spring-Set Brake
Low Inertia Spring-Set Brakes

1050 Newton Meter (N·m) Static Torque Rating at 60 Pound Force per Square Inch (lbf/in²) Minimum Release Pressure Low Inertia Spring-Set Brake
Description N/A WPT® Low Inertia Spring-Set (LISS) Brakes are a spring-applied / air-release design well suited for fail-safe applications. The LI Spring Set can also be used as a parking brake since no pressure is required to engage the brake. With adjustable spring release pressures, the LI Spring-Set can provide a range of torques that will suit many applications. WPT®'s Low Inertia Spring-Set Brakes are available in 1, 2, or 3 plate configurations with sizes ranging 6 through 60 inches.
Brands N/A WPT®
Static Torque Rating at 60 Pound Force per Square Inch (lbf/in²) (4.1 bar) Minimum Release Pressure N/A 2510 lbf·in284 N·m N/A 5020 lbf·in567 N·m N/A 4130 lbf·in467 N·m N/A 7590 lbf·in858 N·m N/A 9270 lbf·in1050 N·m
Static Torque Rating at 75 Pound Force per Square Inch (lbf/in²) (5.2 bar) Minimum Release Pressure N/A 3130 lbf·in354 N·m N/A 6270 lbf·in708 N·m N/A 5170 lbf·in584 N·m N/A 9480 lbf·in1070 N·m N/A 11600 lbf·in1310 N·m
Static Torque Rating at 90 Pound Force per Square Inch (lbf/in²) (6.2 bar) Minimum Release Pressure N/A 3760 lbf·in425 N·m N/A 7520 lbf·in850 N·m N/A 6200 lbf·in701 N·m N/A 11400 lbf·in1290 N·m N/A 13900 lbf·in1570 N·m
Note for Static Torque Rating at Minimum Release Pressure N/A Dynamic (slipping) Torque is 75% of the Static Torque.
Maximum Speed Hub and Center Plate (CP) N/A 5280 rpm N/A 5280 rpm N/A 4290 rpm N/A 4290 rpm N/A 3120 rpm
Maximum Slip Speed N/A 2620 rpm N/A 2620 rpm N/A 1890 rpm N/A 1890 rpm N/A 1430 rpm
Total Weight N/A 41 lb18 kg N/A 46 lb21 kg N/A 70 lb32 kg N/A 95 lb43 kg N/A 160 lb70 kg
Hub and Center Plate (CP) Weight N/A 6.7 lb3.1 kg N/A 13 lb5.7 kg N/A 9.3 lb4.2 kg N/A 22 lb10 kg N/A 27 lb12 kg
Hub and Center Plate (CP) Inertia N/A 0.19 lb·ft²0.0080 kg·m² N/A 0.37 lb·ft²0.016 kg·m² N/A 0.46 lb·ft²0.019 kg·m² N/A 0.95 lb·ft²0.040 kg·m² N/A 2.3 lb·ft²0.10 kg·m²
Lining Area N/A 39 in²250 cm² N/A 78 in²500 cm² N/A 55 in²360 cm² N/A 110 in²710 cm² N/A 110 in²730 cm²
Minimum Bore Range1 N/A 0.88 in22.4 mm N/A 0.88 in22.4 mm N/A 0.94 in23.9 mm N/A 1.13 in28.7 mm N/A 1.25 in31.8 mm
Maximum Bore Range2 N/A 1.90 in48.3 mm N/A 1.90 in48.3 mm N/A 2.50 in63.5 mm N/A 2.50 in63.5 mm N/A 2.80 in71.1 mm
Dimension - A (Imperial Mounting) N/A 8.753 in222.33 mm N/A 8.753 in222.33 mm N/A 12.125 in307.98 mm N/A 12.125 in307.98 mm N/A 16.000 in406.40 mm
Dimension - A Tolerance (Imperial Mounting) N/A +0.000 mm-0.003 mm+0.00 in-0.08 in
Dimension (B) Hole Circle (Imperial Mounting) N/A 8.00 in203.2 mm N/A 8.00 in203.2 mm N/A 11.13 in282.6 mm N/A 11.13 in282.6 mm N/A 14.75 in374.7 mm
Dimension (B) Diameter (Imperial Mounting) N/A 11/32 in N/A 11/32 in N/A 17/32 in N/A 17/32 in N/A 21/32 in
Quantity (Imperial Mounting) N/A 4 N/A 4 N/A 6 N/A 6 N/A 6
Dimension - C (Imperial Mounting) N/A 7.380 in187.45 mm N/A 7.380 in187.43 mm N/A 8.378 in212.80 mm N/A 8.378 in212.80 mm N/A 11.378 in289.00 mm
Dimension - C Tolerance (Imperial Mounting) N/A +0.00 mm-0.08 mm+0.000 in-0.003 in
Dimension - A (Metric Mounting) N/A 220.00 mm N/A 220.00 mm N/A 310.00 mm N/A 310.00 mm N/A 400.00 mm
Dimension - A Tolerance (Metric Mounting) N/A +0.00/-0.08 mm
Hole Circle (B) (Metric Mounting) N/A 203.0 mm N/A 203.0 mm N/A 280.0 mm N/A 280.0 mm N/A 280.0 mm
Diameter (B) (Metric Mounting) N/A 9.0 mm N/A 9.0 mm N/A 14.0 mm N/A 14.0 mm N/A 18.0 mm
Quantity (Metric Mounting) N/A 4 N/A 4 N/A 6 N/A 6 N/A 6
Dimension - C (Metric Mounting - H7) N/A 190.00 mm N/A 190.00 mm N/A 220.00 mm N/A 220.00 mm N/A 289.00 mm
Dimension - D N/A 8-3/4 in223.8 mm N/A 8-3/4 in223.8 mm N/A 9-3/8 in238.1 mm N/A 9-3/8 in238.1 mm N/A 11-15/16 in303.2 mm
Dimension - E (Ventilated Center Plate) N/A 5.47 in138.94 mm N/A 6.59 in167.39 mm N/A 5.94 in150.88 mm N/A 7.25 in184.15 mm N/A 6.88 in174.75 mm
Dimension - E (Ductile Slotted Center Plate) N/A N/A N/A 5.50 in139.70 mm N/A N/A
Features N/A
  • Available in hydraulic or pneumatic release
  • High cycle life
  • Predictable preventative maintenance
  • Solid, slotted, or ventilated center plate options
  • Available with Full Marine Corrosion Protection package
  • Compatible with the Power Performance LI upgrade
  • Type approval certification available: DNV, ABS, ATEX
Note N/A Consult WPT® Application Engineering for application assistance, service factors, specifications, and detailed drawings/3D models.
  • 1 Contact WPT® for larger bore sizes. Listed bore sizes are for square key.
  • 2 Contact WPT® for larger bore sizes. Listed bore sizes are for square key.