Castair 10 HP Rotary Screw Air Compressor — 40 CFM @ 100 PSI, 80/120 Gal ASME Tank, 100% Duty Cycle
The Castair 10 HP Rotary Screw Air Compressor is a 100% duty-cycle screw unit built to run all day, every day — no cool-down periods, no lockout codes, just power in, air out. It delivers 40 CFM at 100 PSI, and comes self-contained on a USA-made ASME-certified tank with the magnetic starter and controls already mounted and wired. Castair engineered this line to be the most user-friendly rotary screw on the market to install, operate, and maintain — one solenoid runs the air-end, with no computer to fault out. Built to order by Castair, a family-owned Minnesota manufacturer since 1991.
Why It's Different: The whole design philosophy is serviceable, off-the-shelf parts: standard V-belts with an adjustable tightener, spin-on oil and separator filters, automotive-type paper air filter, and copper air/oil lines you can source anywhere. A built-in air/oil separator, air-cooled aftercooler/oil cooler (removable for cleaning), easy-to-read pressure and temperature gauges, and an hour meter all come standard. High-pressure and dual high-temperature shutdowns protect the unit, and a 10-minute shutdown timer saves electricity when no air is being drawn. Heavy-duty industrial 1,725 RPM motors carry a full 15% service factor.
Best For: Automotive shops, fabrication, and light manufacturing that run air-hungry tools throughout the day.
Configuration: Choose single-phase or three-phase power, an 80-gallon or 120-gallon ASME tank, vertical or horizontal tank orientation. Selectable pressure: 135, 150, or 175 PSI (135 PSI standard).
⚠️ BEFORE YOU ORDER — PLEASE READ: This is a built-to-order industrial rotary screw compressor.
• Electrical: requires a dedicated 208–230V (or 460V) circuit, single-phase or three-phase per your selected model, installed by a licensed electrician with proper grounding. Magnetic starter comes mounted and wired — just connect power.
• Lead time: all Castair units are built to order — confirm current production lead time before purchase.
• Weight & placement: 565–660 lb depending on configuration; requires a level floor, adequate ventilation for heat dissipation, and freight handling for delivery.
It is the customer's responsibility to verify electrical service, floor space, and ventilation before purchase and installation.
Features
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100% duty cycle — runs continuously with no required cool-down
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40 CFM @ 100 PSI rated output
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Self-contained on a USA-made ASME-certified tank — no separate water separator or tank plumbing needed
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Magnetic starter & controls mounted and wired — just connect power
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One solenoid operates the air-end — no computers, no lockout codes
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Selectable pressure: 135 / 150 / 175 PSI (135 PSI standard)
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Built-in air/oil separator with spin-on filter
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Air-cooled aftercooler / oil cooler standard — removable for easy cleaning
- Pressure & temperature gauges, hour meter standard
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High-pressure + dual high-temperature shutdown protection
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10-minute shutdown timer saves electricity when air isn't needed
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Heavy-duty industrial 1,725 RPM motor with full 15% service factor
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Off-the-shelf serviceable parts — standard V-belts, spin-on filters, copper lines
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Factory-filled synthetic lubricant (4,000 hours / 1 year)
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2-year warranty on air-end, electric motor & tank
Specifications
| Castair Rotary Screw 10 HP — 40 CFM @ 100 PSI |
| Model |
Phase |
Tank (Gal) |
Orientation |
L × W × H (in) |
Wt (lb) |
| R1018VP75 |
Single |
80 |
Vertical |
34 × 26 × 70 |
565 |
| R1018HP75 |
Single |
80 |
Horizontal |
64 × 32 × 44 |
565 |
| R10112VP75 |
Single |
120 |
Vertical |
44 × 32 × 73 |
660 |
| R10112HP75 |
Single |
120 |
Horizontal |
69 × 33 × 55 |
660 |
| R1038VP75 |
Three |
80 |
Vertical |
34 × 26 × 70 |
585 |
| R1038HP75 |
Three |
80 |
Horizontal |
64 × 32 × 44 |
585 |
| R10312VP75 |
Three |
120 |
Vertical |
44 × 32 × 73 |
645 |
| R10312HP75 |
Three |
120 |
Horizontal |
69 × 33 × 55 |
645 |
| Shared Specifications |
| Manufacturer |
Castair (Spicer, Minnesota — family-owned since 1991) |
| Type |
Rotary screw air compressor, 100% duty cycle, ASME tank |
| Total HP |
10 HP |
| Output |
40 CFM @ 100 PSI |
| Pressure |
Selectable 135 / 150 / 175 PSI (135 standard) |
| Motor |
Industrial 1,725 RPM, 15% service factor |
| Voltage |
208–230V / 460V, single-phase or three-phase |
| Tank |
80 or 120 gal, ASME-certified (USA-made), vertical or horizontal |
| Lubricant |
Factory-filled synthetic, 4,000 hr / 1 yr |
| Warranty |
2 years on air-end, electric motor & tank |
| Certification |
ASME-certified air receiver tank |
| Brand |
Castair |
What's Included
- Rotary screw compressor self-contained on a USA-made ASME tank
- Magnetic motor starter & controls — mounted and wired
- Built-in air/oil separator, air-cooled aftercooler/oil cooler
- Pressure & temperature gauges, hour meter
- Factory-filled synthetic lubricant (4,000 hr / 1 yr)
- (Factory-mounted options available — electronic auto tank drain, vibration pads. Preventative-maintenance kits, ball valves & metal flex lines also available. Contact us to configure.)
Manuals & Documentation