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WPT® Low Inertia Brakes (LIB) are well suited for high cycle and tension control applications, such as steel shears and unwind stands. The LIB utilize a ventilated design to optimize the airflow in and out of the brake. This increased airflow allows the brake to run cooler in high cycle applications. WPT®'s Low Inertia Brakes are available in 1, 2, or 3 plate configurations with sizes ranging from 6 through 60 inches.
Low Inertia Brakes
Low Inertia Brakes - 2
Unit of Measure
Items Low Inertia Brakes
106-LI
510 Newton Meter (N·m) Static Torque Rating at 100 Pound per Square Inch (psi) (7 bar) Pressure Low Inertia Brake 		Low Inertia Brakes
206-LI
1020 Newton Meter (N·m) Static Torque Rating at 100 Pound per Square Inch (psi) (7 bar) Pressure Low Inertia Brake 		Low Inertia Brakes
108-LI
845 Newton Meter (N·m) Static Torque Rating at 100 Pound per Square Inch (psi) (7 bar) Pressure Low Inertia Brake 		Low Inertia Brakes
208-LI
1690 Newton Meter (N·m) Static Torque Rating at 100 Pound per Square Inch (psi) (7 bar) Pressure Low Inertia Brake 		Low Inertia Brakes
111-LI
1900 Newton Meter (N·m) Static Torque Rating at 100 Pound per Square Inch (psi) (7 bar) Pressure Low Inertia Brake
Description N/A WPT® Low Inertia Brakes (LIB) are well suited for high cycle and tension control applications, such as steel shears and unwind stands. The LIB utilize a ventilated design to optimize the airflow in and out of the brake. This increased airflow allows the brake to run cooler in high cycle applications. WPT®'s Low Inertia Brakes are available in 1, 2, or 3 plate configurations with sizes ranging from 6 through 60 inches.
Brands N/A WPT®
Static Torque Rating at 100 Pound per Square Inch (psi) (7 bar) Pressure1 N/A 4520 lbf·in510 N·m N/A 9030 lbf·in1020 N·m N/A 7480 lbf·in845 N·m N/A 15000 lbf·in1690 N·m N/A 16800 lbf·in1900 N·m
Maximum Speed Hub and Center Plate (CP) N/A 5290 rpm N/A 5290 rpm N/A 4300 rpm N/A 4300 rpm N/A 3130 rpm
Maximum Slip Speed N/A 3530 rpm N/A 3530 rpm N/A 2870 rpm N/A 2870 rpm N/A 2090 rpm
Total Weight N/A 23 lb10 kg N/A 36 lb16 kg N/A 56 lb25 kg N/A 64 lb29 kg N/A 130 lb60 kg
Hub and Center Plate (CP) Weight N/A 6.6 lb3.0 kg N/A 12 lb5.6 kg N/A 9.3 lb4.2 kg N/A 21 lb10 kg N/A 27 lb12 kg
Hub and Center Plate (CP) Inertia N/A 0.17 lb·ft²0.0072 kg·m² N/A 0.35 lb·ft²0.015 kg·m² N/A 0.46 lb·ft²0.019 kg·m² N/A 0.90 lb·ft²0.038 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 Range2 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 Range3 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 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 N/A +0.000 in-0.003 in+0.00 mm-0.08 mm
Hole Circle (B) N/A 8.00 in203.2 mm N/A 8.00 in203.2 mm N/A 11.13 in282.7 mm N/A 11.13 in282.7 mm N/A 14.75 in374.7 mm
Diameter (B) 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 N/A 4 N/A 4 N/A 6 N/A 6 N/A 6
Dimension - C N/A 7.377 in187.38 mm N/A 7.377 in187.38 mm N/A 8.375 in212.80 mm N/A 8.375 in212.80 mm N/A 11.375 in288.93 mm
Dimension - C Tolerance N/A +0.000 in-0.003 in+0.00 mm-0.08 mm
Dimension - A (Metric Mounting) N/A 220.04 mm N/A 220.04 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 mm-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 375.0 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 295.00 mm
Dimension - D N/A 8-13/16 in223.8 mm N/A 8-13/16 in223.8 mm N/A 11-1/8 in282.6 mm N/A 11-1/8 in282.6 mm N/A 14-3/4 in374.7 mm
Dimension - E (Ventilated Center Plate) N/A 3-3/4 in36.5 mm N/A 4-15/16 in36.5 mm N/A 4-9/16 in44.5 mm N/A 5-15/16 in44.5 mm N/A 5-7/16 in44.5 mm
Dimension - E (Ductile Slotted Center Plate) N/A N/A N/A 5-7/8 in149 mm N/A 7-1/4 in184 mm N/A 9-11/16 in209 mm
Features N/A
  • Predictable preventative maintenance
  • Available in hydraulic or pneumatic actuation
  • Solid, slotted, or ventilated center plate options
  • Available with Full Marine Corrosion Protection package
  • Compatible with the Power Performance LI upgrade
  • High cycle life
Note N/A Consult WPT® Application Engineering for application assistance, service factors, specifications, and detailed drawings/3D models.
  • 1 Dynamic (slipping) torque is 75% of the static torque.
  • 2 Contact WPT® for larger bore sizes. Listed bore sizes are for square key.
  • 3 Contact WPT® for larger bore sizes. Listed bore sizes are for square key.