Industrial Clutches

Multiple Disc Clutches, Brakes and Clutch-BrakesDownload our PDF Brochure
Hydraulic / Pneumatic ActuatedLogan Pneumatic Clutch

Simple, Compact, High Torque Design

Logan Fluid or Air actuated clutches, brakes, and clutch-brake combinations are used in a wide variety of Machine Tool, Industrial, Marine, Municipal, Mining and Off-Highway applications. Our attention to quality and service, along with the ability to modify standard units to meet specific customer needs, has lead to the success and growth of Logan Clutch Corporation.

The Standard Logan product line is described on this web page. It consists of three series of clutches and brakes with design features that are beneficial to their installation, operation and maintenance. Each series has model sizes with friction discs ranging in diameter from 2.5 inches (64 mm) to 12 inches (305 mm). All models can be furnished with standard lug or gear toothed friction discs.

Clutch Applications

When used as a clutch, the hub is keyed to the drive shaft. The drive cup is attached to a bearing mounted gear, sprocket or sheave, which can freewheel about the same shaft. The hub or the drive cup can be the driving or driven member.

The above arrangement is used to transmit torque between two parallel shafts. When torque must be transmitted between in-line shafts, one half of a flexible coupling is used to connect the bearing mounted drive cup to the other shaft.

Brake Applications

When S and P units are used as a brake, their hub is keyed to the shaft to be stopped. The drive cup is held stationary by the drives supporting frame. The R series allows either its hub or drive cup to be the stationary member. An external cylinder port is provided when the hub is held stationary.


Pressurizing the cylinder with fluid or air forces the piston to clamp and lock the friction and separator discs. Torque is transmitted through the interfaces between hub and separator disc splines, separator and friction discs, and friction disc tangs and drive cup slots. When pressure is removed, the release springs separate the separator discs and maintain a running clearance between separator and friction discs.


R and S Series:

Logan R and S Series Clutches and brakes are designed primarily for R and S Series: wet operation within gear boxes and transmissions. They can be partially submerged in an oil sump or an oil splash or spray can be directed on the outside diameter of the disc patch. This wet operation aids in dissipating the thermal energy generated at the disc friction interfaces.

S series units require lubrication of the cylinder and thrust bearings. Usually, the oil splash or spray directed at the disc pack provides sufficient lubrication. Lube ports are available for specific applications.

P Series:

P series clutch bearings are greased and sealed and do not require external lubrication. Torque ratings are based on dry operating conditions.


R and S Series: 

In demanding applications with multiple engagements within a short period of time; or applications with very high inertia; the R and S clutch can be provided with oil passages for lubrication and intensive coolant flow through the shaft. This requires that the clutch be mounted on a shaft with a center drilled hole for coolant supply and a rotary coolant inducer. The coolant carries away the heat generated by multiple engagements or slow engagement. 

P Series:

P series clutch bearings are greased and sealed and do not require external lubrication. Torque ratings are based on dry operating conditions.

Convenient to Maintain

Logan Clutches and brakes do not require linkages, levers, or adjusting collars. At drive system service time, in-stock disc pack kits, seal kits, and bearing repair kits, along with factory installation data sheets make maintenance quick and easy. Factory reconditioning is also available.

Standard FeaturesLogan Air Clutch 4 1/2
  • Maximum Torque / Minimum Envelope
  • Hydraulic or Pneumatic Actuation Wet or Dry Operation
  • Wet or Dry Operation
  • Fast Engagement / Quick Release
  • Minimal Freewheeling Drag
  • Compact Design
  • Custom Bore Diameters / Keyways
  • Modified Standards for Specific Design Requirements
  • Increased Torque and RPM Capability
  • Geared Friction Disc and Drive Cup Interface
  • Custom Drive Cups
  • Forced Cooling and Thrust Bearing Lubrication
  • Mounted for Use as a Power-Applied Brake


Stationary Cylinder for Precise Alignment

The actuating cylinder and piston in the S series design do not rotate. They are bearing supported on the mounting hub and are held stationary by the external connection to the inlet port. This bearing allows the separator discs and hub, and the shaft on which it mounts, to rotate about the cylinder and piston. A thrust bearing permits relative motion between the stationary piston and rotating separator discs. Because both bearings require lubrication, it is important to utilize lube ports provided and/or direct an oil spray or splash at bearing surfaces.

  • Hydraulic or Pneumatic Actuation
  • Wet Operation
  • Stationary Cylinder and Piston
  • Fast Response 
  • Easy Installation
  • Minimal Actuating Flow
  • Positive Disengagement
  • Can be Modified to Meet Specific

Application Requirements


Sealed Ball Bearings for Dry Operation

The P Series design is similar to the S Series, which is designed for wet operation. The P Series is designed for dry operation – bearings are pre-lubricated and sealed and do not require external lubrication. Torque ratings are based on the P Series disc pack operating in dry conditions – thus requiring lower actuation pressure to achieve high rates of torque.


The P Series is ideal for light duty applications with low actuation frequency and low inertia. 

  • Hydraulic or Pneumatic Actuation
  • Sealed Pre-lubricated Bearings
  • Dry Applications
  • Stationary Cylinder and Piston
  • Fast Response 
  • Easy Installation
  • Minimal Actuating Flow
  • Positive Disengagement
  • Can be Modified to Meet Specific

Application Requirements

High Torque / Small Envelope

The R series design provides maximum torque within a small envelope. In the R Series design, the piston and actuating cylinder, which is integral with the mounting hub, rotate. Bearings are not required.

The shaft on which the hub mounts is rifled and cross drilled to provide passage for the actuating media. A press fit or cap seals are necessary to prevent media pressure loss due to seepage past the hub and shaft interface. Although the R series design can withstand high rotational speeds, consideration must be given to disengaging and freewheeling speeds when the units are hydraulically actuated. Review the maximum disengaging speed for each standard model.

  • Hydraulic or Pneumatic Actuation
  • Does Not Require Bearings
  • Short Axial Length
  • Fast Response
  • Minimal Drag, Positive Disengagement
  • Light Weight
  • Maximum Torque
  • Minimal Actuating Flow
  • Can be Modified to Meet Specific

Application Requirements


Clutch and Brake Drive Cups

Modified R Series Drive Cup with large diameter pilot bore and bolt circle pattern.

Modified S 550 Series Drive Cup with splined shaft.

Typical R, S, P Series Geared Drive Cup with standard Pilot bore.

Logan Drive Cups are manufactured to perform in harsh conditions. Contact surfaces are heat treated to ensure long life. Standard cups are furnished with 1" and 2" diameter pilot bores. All models can be furnished with standard lug or gear toothed

  • Bolt Circle patterns, bores and axial lengths can be modified to meet specific design requirements.
  • Drive Cups can be designed and manufactured to be integral with shafts, gears, couplings and stationary members (when used as a brake cup).

Typical Clutch and Brake Installations



Logan Multiple Disc Clutch and Brake Applications

Friction faced and high-carbon steel separator discs

Logan also manufactures and stocks a wide variety of both friction faced and high carbon-steel discs for wet or dry clutch and brake applications. Logan incorporates the latest technology in friction facing material.

  • Reduce tooling costs with existing Logan Tooling.
  • Improve the quality of your existing friction or steel separator discs with improved friction material coefficients, heat treat specifications and mating disc surface finishes.
  • Reduce costs and improve delivery by ordering small lots from existing Logan disc inventory.

Consider Logan when designing or improving upon your single or multiple disc clutch or brake applications.

Logan SAE PTO Clutches

Logan PTO Series Clutches are designed to mount between the power take-off of an engine, multi-station pump drive, hydraulic motor or pump. OEM and Aftermarket designers can take advantage of energy savings and component longevity by utilizing Logan PTO’s to drive Auxiliary attachments only when required.

PTO Applications:

  • Single and Multi-station Pumps
  • Mobile or Stationary Auxiliary Drives
  • Connect-Disconnect Direct Drives
  • Municipal Fire Trucks
  • Air Rescue Fire Fighting Vehicles
  • Marine Fishing Boats / Work Boats / Winches

New! Logan Bell Housing PTO Clutches

  • Self-AdjustingTM Disc Pack – Minimize Slippage
  • Eliminates Mechanical Linkages, Hand Levers, Yokes
  • Air or Fluid Actuated – (air is ideal for cold start applications)
  • Fast Engagement – Quick Release
  • Remote Actuation
  • Modified Standards Available
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