Ingersoll Rand 3840P Multi-Vane Reversible Air Motor is designed to provide dependable pneumatic rotary power for industrial applications requiring increased output torque, controlled operating speeds, and bidirectional operation. Part of the 3840 Series, this air motor delivers 1.35 HP with a free speed of 440 RPM. Its durable multi-vane design converts compressed air into smooth, continuous rotary motion, while the reversible configuration allows both clockwise and counterclockwise operation for equipment requiring flexible directional control.
The 3840P develops 40 ft-lbs starting torque, providing substantial breakaway force to initiate rotation under load, and 53.5 ft-lbs stall torque, representing the maximum torque produced when the output shaft is prevented from rotating. This combination of controlled speed, dependable horsepower, and reversible operation makes the motor well suited for OEM machinery, indexing systems, conveyors, processing equipment, material handling systems, and other compressed-air powered industrial applications.
Type: Multi-Vane Air Motor | Series: 3840 Series | Model: 3840P | Rotation: Reversible | Power: 1.35 HP | Free Speed: 440 RPM | Starting Torque: 40 ft-lbs | Stall Torque: 53.5 ft-lbs
Features:
- Multi-vane air motor design delivers smooth, dependable pneumatic rotary power.
- Reversible configuration provides reliable clockwise and counterclockwise operation.
- 1.35 HP output supports demanding industrial pneumatic drive applications.
- 440 RPM free speed is ideal for applications requiring controlled rotary motion with increased torque.
- 40 ft-lbs starting torque helps overcome heavier startup loads efficiently.
- 53.5 ft-lbs stall torque provides a manufacturer-published reference for evaluating maximum torque capability.
- 3840 Series motor integrates easily into compatible OEM machinery and replacement installations.
- Compressed-air operation eliminates the need for electrical power at the motor, making it suitable for facilities utilizing centralized pneumatic systems.
Made in USA: 
Applications:
- OEM machinery requiring reversible pneumatic rotary power.
- Industrial conveyors, indexing equipment, and positioning systems.
- Material handling and processing equipment requiring bidirectional rotation.
- Packaging and production machinery.
- Replacement applications where the published motor specifications match the original equipment.
FAQs:
- Q: Is the Ingersoll Rand 3840P reversible?
A: Yes. This model is designed to operate in both clockwise and counterclockwise directions for applications requiring bidirectional shaft rotation. - Q: What is a multi-vane air motor?
A: A multi-vane air motor uses sliding vanes inside a rotor to convert compressed air into smooth, continuous rotary motion with consistent power delivery. - Q: What is the rated free speed?
A: The manufacturer specifies a free speed of 440 RPM. - Q: What is the difference between starting torque and stall torque?
A: Starting torque is the torque available to begin rotating a load from rest, while stall torque is the maximum torque developed when the output shaft is prevented from rotating. - Q: What should be verified before installation?
A: Confirm horsepower, free speed, rotation direction, shaft dimensions, mounting arrangement, and compressed-air requirements using the Ingersoll Rand Air Motor Catalog before installation.

| SKU | Max. Power | Speed at Max. Power rpm |
Free Speed rpm |
Starting Torque | Stall Torque | Air Consumption at Max. Power | Weight | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| hp | kw | lb-ft | Nm | lb-ft | Nm | scfm | m³/m | lb | kg | |||
| NON-REVERSIBLE — Direction of rotation is counterclockwise when facing the shaft | ||||||||||||
| 3800M | 1.55 | 1.16 | 520 | 1,100 | 24 | 32.5 | 33 | 44.8 | 48 | 1.36 | 7 1/8 | 3.23 |
| 3800P | 1.45 | 1.08 | 285 | 600 | 42 | 57 | 56.5 | 76.6 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800Q | 1.45 | 1.08 | 180 | 375 | 62 | 84 | 83.5 | 113 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800R | 1.45 | 1.08 | 150 | 320 | 72 | 98 | 96 | 130 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800S | 1.45 | 1.08 | 120 | 255 | 88 | 119 | 118 | 160 | 48 | 1.36 | 8 1/2 | 3.86 |
| 3800U | 1.45 | 1.08 | 105 | 220 | 105 | 142 | 140 | 189 | 48 | 1.36 | 8 1/2 | 3.86 |
| REVERSIBLE | ||||||||||||
| 3840M | 1.40 | 1.04 | 390 | 825 | 23 | 31.2 | 31.5 | 42.7 | 44 | 1.25 | 7 3/8 | 3.35 |
| 3840P | 1.35 | 1.01 | 215 | 440 | 40 | 54.2 | 53.5 | 72.6 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840Q | 1.35 | 1.01 | 130 | 280 | 60 | 81.4 | 80 | 106 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840R | 1.35 | 1.01 | 122 | 238 | 69 | 93 | 92 | 125 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840S | 1.35 | 1.01 | 100 | 190 | 86 | 116 | 115 | 156 | 44 | 1.25 | 8 3/4 | 3.97 |
| 3840U | 1.35 | 1.01 | 83 | 162 | 100 | 135 | 134 | 181 | 44 | 1.25 | 8 3/4 | 3.97 |
Looking for more information about Ingersoll Rand Air Motor? Click here to view the Catalog
For help selecting the correct Ingersoll Rand Air Motors for your assembly application, call (800) 608-5210 or email info@intlairtool.com
warning WARNING: This or other products sold on this website may expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to www.P65Warnings.ca.gov
