Cleco B4R319M Reversible Axial Piston Air Motor | 0.9 HP | 1,020 RPM | 21 (ft-lbs) Stall Torque | Rear Exhaust

For powered fixtures, small winches, valve actuation, indexing equipment, and other machine-integrated drive applications, the Cleco B4R319M Reversible Axial Piston Air Motor delivers 0.9 HP with a 1,020 RPM free speed and 21 ft-lbs stall torque. The axial piston design converts compressed air into rotary output with strong starting capability, while reversible control allows the motor to drive in either direction for applications that require forward and reverse motion. Its 4.1:1 gear ratio provides a useful balance of speed and torque for machinery that needs more turning force than a direct-drive air motor without moving into a very low-speed reduction model.

The B4 Series configuration includes a 7/8" keyed spindle, rear exhaust, and face-mountable layout for integration into custom equipment, production fixtures, conveyors, mixers, hoists, and pneumatic drive systems. Air motors are often selected where electric motors may be less suitable, including wet areas, frequent start-stop duty, and installations where the motor must tolerate stalling without electrical overload.

Type: Reversible Axial Piston Air Motor | Series: B4 Series | Model: B4R319M | Max Power: 0.9 HP / 0.67 kW | RPM @ Max HP: 525 RPM | Free Speed: 1,020 RPM | Stall Torque: 21 ft-lbs / 28 Nm | Starting Torque: 15 ft-lbs / 20 Nm | Gear Ratio: 4.1:1 | Spindle Type: 7/8" Keyed Spindle | Control: Reversible | Exhaust: Rear Exhaust | Air Consumption: 39.9 SCFM | Air Inlet: 3/8" NPTF | Weight: 14.5 lbs / 6.57 kg | Length: 13.19" | Maximum Overhung Load @ Stall: 800 lbs / 363 kg | Rated Air Pressure: 90 PSI / 620 kPa

Features:

• Axial piston air motor configuration provides high starting torque for loads that need immediate turning force at startup.
• Reversible control allows clockwise and counterclockwise operation for indexing, winding, positioning, and bidirectional machine motion.
• 0.9 HP / 0.67 kW maximum power supports machine-drive applications where compact pneumatic power is preferred over an electric motor.
• 1,020 RPM free speed and 525 RPM at maximum horsepower provide a mid-speed output range for driven equipment and production fixtures.
• 4.1:1 gear ratio increases usable output torque while maintaining higher speed than deeper-reduction B4 Series models.
• 7/8" keyed spindle supports positive mechanical power transfer to compatible couplings, pulleys, sprockets, or custom drive components.
• Rear exhaust helps route exhaust air away from the work area or machine interface when installed inside equipment.
• Performance is rated at 90 PSI, with clean, dry compressed air recommended for consistent operation and service life.

Made in USA:

Applications:

• Production machinery and automation — driving small fixtures, rotary tables, feed mechanisms, and machine-integrated motion systems.
• Conveyors and material handling — powering intermittent movement, indexing, and reversible transfer points where air power is already available.
• Mixers, pumps, and process equipment — supplying pneumatic rotary power in wet, dirty, or repetitive-duty environments.
• Valve actuation and positioning — turning mechanical linkages or rotary devices that require controlled forward and reverse operation.
• Hoists, winches, and winding systems — supporting compact drive packages where stall tolerance and starting torque are important.

FAQs:

• Q: What does stall torque mean on the Cleco B4R319M?
  A: Stall torque is the torque produced when the motor is loaded until rotation stops. For this model, the stall torque is 21 ft-lbs, which helps determine whether the motor can start or hold the load in the intended application.
• Q: Can this air motor replace an electric motor?
  A: It may be a good replacement when the required power, speed, torque, mounting, spindle, and air supply match the machine. Air motors are commonly used where variable speed, stall tolerance, washdown exposure, or compressed-air infrastructure make pneumatic power practical.
• Q: What air supply is required?
  A: The B4R319M is performance rated at 90 PSI and has an air consumption value of 39.9 SCFM. The air system should provide clean, dry air at the required pressure and enough flow to maintain speed under load.
• Q: What is the advantage of the keyed spindle?
  A: A keyed spindle uses a keyway to help transmit torque to a matching coupling, sprocket, pulley, or drive component. This provides a more positive connection than friction-only mounting methods when torque loads fluctuate.
• Q: Is the B4R319M the highest torque model in the B4 Series?
  A: No. This model provides a balance of speed and torque with 1,020 RPM free speed and 21 ft-lbs stall torque. Lower-speed B4 Series models provide higher stall torque when the application requires more turning force.

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