Ingersoll Rand 7538-B Non-Reversible Air Power Motor provides pneumatic rotary power for machinery requiring lower-speed output and a single direction of rotation. Rated at 0.25 HP and 550 RPM, this model uses a double gear reduction configuration to reduce motor speed and provide the specified output characteristics at the driven shaft. The non-reversible design is intended for equipment where bidirectional operation is not required.
For OEM machinery, equipment integration, and compatible replacement applications, the 7538-B develops 8.2 lb-ft stall torque. Stall torque is the torque developed when the applied load prevents the motor output from rotating and serves as an important reference when evaluating load requirements. The combination of 550 RPM output, 0.25 HP rating, and double gear reduction gives machine builders and maintenance professionals key specifications for determining whether this air power motor matches the intended equipment.
Type: Air Power Motor | Model: 7538-B | Rotation: Non-Reversible | Power: 0.25 HP | Speed: 550 RPM | Stall Torque: 8.2 lb-ft | Gear Reduction: Double
Features:
- Pneumatic motor configuration provides rotary output from a compatible compressed-air supply.
- Double gear reduction provides reduced output speed for applications requiring the specified 550 RPM performance.
- 0.25 HP power rating provides a defined specification for matching the motor to compatible driven equipment.
- 550 RPM output supports machinery requiring lower-speed pneumatic rotary motion.
- 8.2 lb-ft stall torque provides an important load reference when evaluating the motor for the intended mechanism.
- Non-reversible configuration supports equipment designed for consistent single-direction rotation.
Made in USA: 
Applications:
- OEM machinery requiring lower-speed pneumatic rotary power.
- Machine-building applications designed around single-direction motor operation.
- Production equipment compatible with the motor's 550 RPM output and 0.25 HP rating.
- Compressed-air-powered mechanisms where a double gear reduction motor configuration matches the equipment requirements.
- MRO replacement installations where the 7538-B specifications and mechanical interfaces match the existing motor.
FAQs:
- Q: Is the Ingersoll Rand 7538-B reversible?
A: No. The 7538-B is specified as a non-reversible air power motor and is intended for equipment requiring rotation in one direction. - Q: What is the output speed of the 7538-B?
A: The supplied product information specifies an output speed of 550 RPM. - Q: What does double gear reduction mean on this air motor?
A: Double gear reduction means the motor uses two stages of gearing to reduce rotational speed between the motor and output. For the 7538-B, the specified output speed is 550 RPM. - Q: What is the stall torque rating of the 7538-B?
A: The specified stall torque is 8.2 lb-ft. Stall torque represents torque developed when the applied load prevents the motor output from rotating. - Q: What should be verified before selecting the 7538-B as a replacement motor?
A: Confirm that the required horsepower, 550 RPM speed, 8.2 lb-ft stall torque, non-reversible operation, and double gear reduction configuration match the application. Shaft, mounting, dimensions, and compressed-air requirements should also be checked against the manufacturer 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 - 0.25 HP | |||||||||||||
| 7538-B | 3/8" Keyed | 550 | 325 | 8.2 | 11.1 | 4.0 | 5.4 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7539-B | 3/8" Keyed | 900 | 550 | 5.0 | 6.7 | 2.4 | 3.2 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7540-B | 3/8" Keyed | 2,700 | 1,600 | 1.75 | 2.3 | 0.82 | 1.1 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7541-B | 3/8" Keyed | 4,500 | 2,700 | 1.05 | 1.4 | 0.49 | 0.66 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7542-C | 3/8" Keyed | 20,000 | 12,000 | 0.22 | 0.3 | 0.11 | 0.14 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7533-B | 3/8"-24 Th’d. | 550 | 325 | 8.2 | 11.1 | 4.0 | 5.4 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7534-B | 3/8"-24 Th’d. | 900 | 550 | 5.0 | 6.7 | 2.4 | 3.2 | 18.1 | 8.5 | 75 | 1.82 | 0.82 | Double |
| 7535-C | 3/8"-24 Th’d. | 2,700 | 1,600 | 1.75 | 2.3 | 0.82 | 1.1 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7536-B | 3/8"-24 Th’d. | 4,500 | 2,700 | 1.05 | 1.4 | 0.49 | 0.66 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| 7537-C | 3/8"-24 Th’d. | 20,000 | 12,000 | 0.22 | 0.3 | 0.11 | 0.14 | 18.1 | 8.5 | 75 | 1.52 | 0.68 | Single |
| Reversible - 0.25 HP | |||||||||||||
| 7543-B | 3/8" Keyed | 550 | 300 | 7.80 | 10.6 | 4.37 | 5.9 | 20.0 | 9.4 | 75* | 1.82 | 0.82 | Double |
| 7544-B | 3/8" Keyed | 900 | 550 | 4.75 | 6.4 | 2.62 | 3.5 | 20.0 | 9.4 | 75* | 1.82 | 0.82 | Double |
| 7545-B | 3/8" Keyed | 2,700 | 1,500 | 1.60 | 2.2 | 0.87 | 1.1 | 20.0 | 9.4 | 75* | 1.52 | 0.68 | Single |
| 7546-B | 3/8" Keyed | 4,500 | 2,400 | 0.98 | 1.3 | 0.55 | 0.7 | 20.0 | 9.4 | 75* | 1.52 | 0.68 | Single |
| 7547-C | 3/8" Keyed | 20,000 | 11,000 | 0.22 | 0.3 | 0.12 | 0.16 | 20.0 | 9.4 | 75* | 1.52 | 0.68 | Single |
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For help selecting the correct Ingersoll Rand Air Power Motors for your assembly application, call (800) 608-5210 or email info@intlairtool.com
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