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KKB 206

  • 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

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


Dynamic Torque Rating (80 psi/5.5 bar)

5440|614 Nm

Dynamic Torque Rating (100 psi/7 bar)

6800|768 Nm

Heat Capacity for Series Water Hosing

20 hp
15 kw

Heat Capacity for Parallel Water Hosing

30 hp
22 kw

Maximum Bore Size

1.75 in
44 mm

Recommended Clearence

1/16-3/32 in
1.5-2 mm

Maximum Speed

3800 rpm

Parallel Water Flow 0 % Ethylene Glycol

3 lgm
11 lpm

Parallel Water Flow 30 % Ethylene Glycol

3.9 lgm
14.8 lpm

Parallel Water Flow 50 % Ethylene Glycol

4.5 lgm
17 lpm

Total Brake Weight

71 lb
32.2 kg

Disc Gear Weight

11.7 lb
5.3 kg

Disc Gear Inertia

0.28 lb·ft
0.01 kg·m

Pressure Drop Parallel Flow with 0 % Ethylene Glycol

0.9 psi
0.06 bar

Pressure Drop Parallel Flow with 30 % Ethylene Glycol


Pressure Drop Parallel Flow with 50 % Ethylene Glycol


Maximum Lining Wear


Maximum Lining Wear


. in3

Pilot Diameter A

8.751/8.753 in
222.28/222.33 mm

Bolt Hole Circle Diameter B

8.000 in
203.20 mm

Pilot Diameter C

7.377/7.379 in
187.38/187.43 mm

Dimension D

8.81 in
223.8 mm

Dimension F

4.63 in
117.6 mm

Dimension G

0.75 in
19.1 mm

Dimension H

7.63 in
193.8 mm

Dimension J

0.13 in
3.3 mm

Number of Bolt Holes


Bolt Hole Size L

0.34 in
8.6 mm

Dimension M

2.94 in
74.7 mm

Dimension N

2.43 in
61.7 mm

Dimension Q

0.38 in
9.7 mm

Number of Inlet Ports – Thread Size

2- 1/2 NPT

Dimension T

2.00 in
50.8 mm

Minimum U

0.60 in
15.2 mm

Maximum U

1.75 in
44.5 mm

Number of Coolant Inlets – Thread Size

3 – 1/4 NPT


Wichita Clutch


Air Applied


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.)