Rolair 7.5 HP Two-Stage Stationary Compressors
Rolair 7.5 HP Two-Stage Stationary Compressors are engineered for high-output industrial environments where compromise is not an option. These units are the backbone of large automotive service centers, commercial tire shops, and manufacturing plants that require a relentless supply of high-pressure air (175 PSI) to keep production lines and heavy-duty tools moving.
By offering the high-speed recovery of the K30 pump or the massive displacement of the K50 pump, Rolair provides a tailored solution for any high-demand facility.
The K30 Series: High-Recovery Workhorse
The K30 pump is a legendary two-stage industrial pump known for its rapid recovery times and consistent performance. In a 7.5 HP configuration, it delivers a perfect balance of CFM and efficiency.
- Configurations: Available in Horizontal (H) and Vertical (V) tanks.
- Power: Options for Single-Phase (751) or Three-Phase (753) service.
- Tank Capacities:
- 60/80 Gallon: Ideal for shops where space and power must be balanced.
- 120 Gallon (112): Provides a large air buffer for high-consumption tools like 1″ impact wrenches.
The K50 Series: Maximum Displacement Industrial Plant
The K50 pump represents the pinnacle of Rolair’s 7.5 HP lineup. Featuring a massive, four-cylinder design, the K50 is built for extreme-duty cycles. It moves a significantly higher volume of air per minute, making it the primary choice for sandblasting, rock drilling, and large-scale pneumatic automation.
- Configurations: Available in Horizontal (H) and Vertical (V) tanks.
- Extreme Storage: These units are most effective when paired with 120-gallon (112) tanks to harness the full potential of the K50’s high CFM output.
- Durability: The four-cylinder design allows the pump to run cooler by distributing the compression load across more surface area.
Model Number Quick Reference
| Code | Meaning |
| V / H | Vertical or Horizontal Tank Orientation |
| 751 / 753 | 751 = 230V Single-Phase |
| 60 / 80 / 112 | Tank Capacity (60, 80, or 120 Gallons) |
| K30 / K50 | Pump Series (K30 = Two-Cylinder / K50 = Four-Cylinder) |
Industrial Engineering Features
- 100% Cast-Iron Construction: Both the K30 and K50 pumps utilize cast-iron cylinders and crankcases for maximum thermal stability and long-term rebuildability.
- Advanced Intercooling: High-capacity finned copper intercoolers significantly reduce air temperature between the first and second compression stages, improving efficiency and reducing moisture.
- Low-RPM Engineering: By running at a lower RPM than many competitors, these units minimize vibration and mechanical wear, resulting in a quieter shop environment and a longer service life.
- Stainless Steel Reed Valves: Precision-ground Swedish steel valves ensure maximum volumetric efficiency and are designed to withstand the heat of continuous-duty operation.
- Total Protection: Includes a heavy-duty, totally enclosed metal belt guard, industrial pressure switches with unloader valves, and ASME-certified, powder-coated tanks.
Technical Selection Guide
| Pump | HP | Max PSI | CFM @ 175 PSI | Ideal Application |
| K30 | 7.5 | 175 | 23.0 | Large Automotive Shops, Multi-User Framing |
| K50 | 7.5 | 175 | 28.1 | Sandblasting, Industrial Manufacturing |
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