Ingersoll Rand 8231-9B Reversible Air Power Motor is engineered to provide dependable low-speed pneumatic rotary power for industrial applications requiring maximum torque and bidirectional operation. Equipped with a planetary gear system and double gear reduction, this air power motor delivers 0.50 HP and operates at a free speed of 475 RPM. Its reversible configuration allows both clockwise and counterclockwise shaft rotation, making it ideal for OEM machinery, automated manufacturing systems, positioning equipment, material handling applications, and industrial processes that require controlled movement with high output torque.
The 8231-9B develops 19.40 lb-ft of stall torque, representing the maximum torque generated when the output shaft is prevented from rotating. The planetary gear design combined with double gear reduction maximizes torque multiplication while maintaining reliable pneumatic performance, making this model well suited for demanding industrial applications where lower operating speed and greater rotational force are essential.
Type: Air Power Motor | Model: 8231-9B | Rotation: Reversible | Gear Type: Planetary Gear | Gear Reduction: Double | Power: 0.50 HP | Speed: 475 RPM | Stall Torque: 19.40 lb-ft
Features:
- Air-powered motor converts compressed air into dependable rotary power for industrial equipment.
- Reversible operation provides clockwise and counterclockwise shaft rotation for applications requiring bidirectional movement.
- Planetary gear assembly delivers efficient power transmission in a compact, rugged design.
- Double gear reduction increases available output torque for demanding low-speed industrial applications.
- 0.50 HP output provides consistent pneumatic performance for compatible machinery.
- 475 RPM free speed is well suited for equipment requiring precise, controlled rotation with high torque output.
- 19.40 lb-ft stall torque provides a manufacturer-published reference for evaluating maximum loading conditions.
Made in USA: 
Applications:
- OEM machinery requiring reversible pneumatic rotary power.
- Industrial automation and positioning systems.
- Material handling, conveyor, and transfer equipment.
- Processing and packaging machinery utilizing planetary geared air motors.
- Replacement installations where the published motor specifications match the original equipment.
FAQs:
- Q: Is the Ingersoll Rand 8231-9B reversible?
A: Yes. This model is designed to operate in both clockwise and counterclockwise directions. - Q: What type of gearing does this motor use?
A: The 8231-9B features a planetary gear system with double gear reduction. - Q: Why does this model use double gear reduction?
A: Double gear reduction provides greater torque multiplication than a single-stage reduction, making it suitable for applications requiring high output torque at lower operating speeds. - Q: What does the 19.40 lb-ft stall torque specification indicate?
A: Stall torque is the maximum torque produced when the output shaft is prevented from rotating. It is a published performance reference and should not be interpreted as a continuous operating torque. - Q: What should be verified before installing this motor?
A: Confirm horsepower, operating speed, rotation direction, gear configuration, shaft dimensions, mounting arrangement, and compressed-air requirements using the Ingersoll Rand Air Motor Catalog before installation.
| SKU | Spindle | R.P.M. | Torque | Air Consumption at Free Speed | Sound Level at Free Speed | Weight | Gear Reduction | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Free Speed | Load Speed at Max. Hp | Stall | Output at Max. Hp | ||||||||||
| lb-ft | Nm | lb-ft | Nm | SCFM | L/s | dB(A) | lbs | kg | |||||
| NON-REVERSIBLE - 0.60 HP | |||||||||||||
| 8230-1A | 3/8" Keyed | 19,000 | 9,800 | 0.70 | 0.9 | 0.32 | 0.4 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8230-2A | 3/8" Keyed | 5,700 | 2,900 | 2.5 | 2.9 | 1.10 | 1.5 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8230-3A | 3/8" Keyed | 3,500 | 1,750 | 3.50 | 4.7 | 1.80 | 2.4 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8230-4A | 3/8" Keyed | 2,800 | 1,400 | 4.50 | 6.1 | 2.20 | 3.0 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8230-5A | 3/8" Keyed | 1,650 | 840 | 7.50 | 10.2 | 3.80 | 5.1 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8230-6A | 3/8" Keyed | 1,000 | 500 | 12.00 | 16.3 | 6.20 | 8.4 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8230-7A | 3/8" Keyed | 800 | 390 | 14.80 | 20.0 | 8.00 | 10.8 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8230-8A | 3/8" Keyed | 600 | 315 | 19.60 | 26.5 | 10.00 | 13.5 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8230-9A | 3/8" Keyed | 500 | 250 | 24.00 | 32.5 | 12.50 | 16.9 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8229-1A | 3/8"-24 Th’d. | 19,000 | 9,800 | .70 | 0.9 | 0.32 | 0.4 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8229-2A | 3/8"-24 Th’d. | 5,700 | 2,900 | 2.15 | 2.9 | 1.10 | 1.5 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8229-3A | 3/8"-24 Th’d. | 3,500 | 1,750 | 3.50 | 4.7 | 1.80 | 2.4 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8229-4A | 3/8"-24 Th’d. | 2,800 | 1,400 | 4.50 | 6.1 | 2.20 | 3.0 | 41 | 19.3 | 80 | 2.45 | 1.10 | Single |
| 8229-5A | 3/8"-24 Th’d. | 1,650 | 840 | 7.50 | 10.2 | 3.80 | 5.1 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8229-6A | 3/8"-24 Th’d. | 1,000 | 500 | 12.00 | 16.3 | 6.20 | 8.4 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8229-7A | 3/8"-24 Th’d. | 800 | 390 | 14.80 | 20.0 | 8.00 | 10.8 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8229-8A | 3/8"-24 Th’d. | 600 | 315 | 19.60 | 26.5 | 10.00 | 13.5 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| 8229-9A | 3/8"-24 Th’d. | 500 | 250 | 24.00 | 32.5 | 12.50 | 16.9 | 41 | 19.3 | 80 | 2.98 | 1.34 | Double |
| REVERSIBLE - 0.50 HP | |||||||||||||
| 8231-1B | 3/8" Keyed | 18,000 | 9,200 | 0.52 | 0.7 | 0.28 | 0.4 | 32 | 15.1 | 80* | 2.45 | 1.10 | Single |
| 8231-2B | 3/8" Keyed | 5,300 | 2,600 | 1.70 | 2.3 | 1.00 | 1.3 | 32 | 15.1 | 80* | 2.45 | 1.10 | Single |
| 8231-3B | 3/8" Keyed | 3,200 | 1,550 | 2.90 | 3.9 | 1.70 | 2.3 | 32 | 15.1 | 80* | 2.45 | 1.10 | Single |
| 8231-4B | 3/8" Keyed | 2,600 | 1,300 | 3.50 | 4.7 | 2.00 | 2.7 | 32 | 15.1 | 80* | 2.45 | 1.10 | Single |
| 8231-5B | 3/8" Keyed | 1,500 | 780 | 5.90 | 8.0 | 3.50 | 4.7 | 32 | 15.1 | 80* | 2.98 | 1.34 | Double |
| 8231-6B | 3/8" Keyed | 950 | 480 | 9.50 | 12.9 | 5.50 | 7.4 | 32 | 15.1 | 80* | 2.98 | 1.34 | Double |
| 8231-7B | 3/8" Keyed | 750 | 380 | 11.80 | 16.0 | 7.00 | 9.5 | 32 | 15.1 | 80* | 2.98 | 1.34 | Double |
| 8231-8B | 3/8" Keyed | 575 | 290 | 15.50 | 21.0 | 9.00 | 12.2 | 32 | 15.1 | 80* | 2.98 | 1.34 | Double |
| 8231-9B | 3/8" Keyed | 475 | 240 | 19.40 | 26.2 | 11.00 | 14.9 | 32 | 15.1 | 80* | 2.98 | 1.34 | Double |
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
- Type
- Air Motor
- Spindle Keyed (in.)
- 3/8
- RPM
- 475
- Load Speed @ Max HP (RPM)
- 240
- Stall Torque (ft-lbs)
- 19.40
- Stall Torque (Nm)
- 26.2
- Torque Output @ Max HP (ft-lbs)
- 11.00
- Torque Output @ Max HP (Nm)
- 14.9
- Air Consumption (SCFM)
- 32
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