Products Catalog
  • Copper disc design for high heat dissipation
  • Accurate control
The Wichita Kopper Kool airtube disc Clutches and Brakes are liquid cooled and consist of a series of alternating discs connecting an inner drive member to an outer drive member.

Engagement is achieved by pneumatic expansion of the airtube. This air-operated clutch contains copper discs for excellent heat dissipation and provides an accurately controlled continuous slip action for constant web tensioning. Tension levels are in direct proportion to air pressure applied.
Unit of Measure

Design Features


  • New friction material lasts longer with less wear on mating copper.
  • Copper alloy wear plates increase heat transfer.
  • Hub spline provides perfect alignment of rotating discs.
  • External air & water connections.
  • Release springs ensure complete disengagement.
  • High strength reinforced neoprene air-tube offers long service life.
  • Optional long stroke air tube available on 18" or 24" size units to increase life and standard maintenance intervals.
  • High thermal capacity.


Assembly Number

N/A 7-321-310-100-0
Dynamic Torque Rating (80 psi/5.5 bar)1 N/A 148800 16511 Nm
Dynamic Torque Rating (100 psi/7 bar)2 N/A 186000 21015 Nm

Heat Capacity for Series Water Hosing

N/A 300 hp224 kW

Heat Capacity for Parallel Water Hosing

N/A 450 hp336 kW

Maximum Bore Size

N/A 6.50 in165 mm

Parallel Water Flow 0 % Ethylene Glycol

N/A 45 gpm170 lpm

Parallel Water Flow 30 % Ethylene Glycol

N/A 59 gpm221 lpm

Parallel Water Flow 50 % Ethylene Glycol

N/A 68 gpm255 lpm

Total Brake (Weight)

N/A 1075 lb488 kg

Disc & Gear (Weight)

N/A 301 lb137 kg

Disc & Gear (Inertia)

N/A 97 lb·ft²4.09 kg·m²

Pilot Diameter A

N/A 26.977/27.000 in685.22/685.80 mm

Bolt Hole Circle Diameter B

N/A 25.500 in647.70 mm

Pilot Diameter C

N/A 21.378/21.375 in543.00/542.93 mm

Dimension D

N/A 24.88 in632 mm

Dimension F

N/A 12.44 in316 mm

Dimension G

N/A 1.25 in31.8 mm

Dimension H

N/A 17.19 in436.6 mm

Dimension J

N/A 0.25 in6.4 mm

Number of Bolt Holes

N/A 10

Bolt Hole Size L

N/A 21/32 in16.7 mm

Dimension M

N/A 11.38 in289.1 mm

Dimension N

N/A 10.50 in266.7 mm

Dimension Q

N/A 1.75 in44.5 mm

Number of Inlet Ports - Thread Size

N/A 3- 1/2 NPT

Dimension T

N/A 11.38 in289.1 mm

Minimum U

N/A 2.00 in50.8 mm

Maximum U

N/A 6.50 in165.1 mm
Number of Coolant Inlets - Thread Size3 N/A 4 - 3/4 NPT


N/A Wichita Clutch


N/A Air Applied


N/A Maximum water jacket inlet pressure is 60 PSI. Brakes with as great as 50 % higher torque capacity is available upon request.

For mounting, use socket head capscrews conforming to the ASTM-574-97a.

  • 1 Static torque will vary with temperature. Maximum air pressure is 100 PSI / 7 BAR. Minimum recommended air pressure is 3 PSI.
  • 2 Static torque will vary with temperature. Maximum air pressure is 100 PSI / 7 BAR. Minimum recommended air pressure is 3 PSI.
  • 3 Number of inlets and outlets are equivalent.
    (Consult factory for drawing before final layout.)