The Castair I51CUC1-S is a 5HP single-phase industrial cube pump compressor with a mounted starter, producing 22 CFM at 767 RPM. The cube pump design sets this apart from a standard reciprocating compressor — the compact cubic pump configuration runs at lower RPM than conventional compressors, which translates directly to lower operating temperatures, quieter operation, and longer pump life between rebuilds. At 767 RPM with 22 CFM output, this unit is built to run continuously without the heat buildup that kills faster-spinning pumps.
Note: Full manufacturer specification sheets were not available at time of publication. The 22 CFM @ 767 RPM figure is sourced from the product name. Contact us to confirm PSI rating, tank size, and voltage before ordering.
Key Features
- 5 HP Industrial Motor: Commercial-duty sustained output for shop environments
- Cube Pump Design: Compact, low-profile pump runs cooler and quieter than standard reciprocating designs
- 22 CFM Output at 767 RPM: High volume delivery at low pump speed — better longevity, lower noise
- Single-Phase Power (230V): Standard shop electrical compatible — no three-phase service needed
- Mounted Magnetic Starter: Integrated overload protection; wire to panel without sourcing additional hardware
- Industrial Series Build: Castair commercial-grade construction
Technical Specifications
- Horsepower: 5 HP
- Phase: Single-phase (1-phase)
- CFM Output: 22 CFM
- Pump RPM: 767 RPM
- Pump Type: Cube pump
- Starter: Mounted magnetic starter included
- Model: I51CUC1-S
- Voltage: 230V single-phase (verify at order)
- PSI / Tank Size: Contact us for confirmed specifications
Cube Pump vs. Standard Reciprocating: Why It Matters
A conventional 5HP shop compressor runs its pump at 900-1100 RPM to produce its rated CFM. The cube pump on this unit makes the same air at 767 RPM — that is roughly 15-20% less mechanical stress per hour of operation. Over a 10-year shop life, the difference in pump wear is significant. If your compressor runs most of the day, the cube pump design is worth the price premium over a standard reciprocating unit.
What This Compressor Handles
- Auto repair and body shops with continuous air tool demand
- Facilities where compressor noise is a concern — the low-RPM cube pump runs noticeably quieter
- Applications requiring consistent air delivery over long operating periods
- Fleet service centers and multi-bay shops on single-phase power
Why Buy From OEM Diagnostic Tools?
We have worked with professional shops since 2016 and carry the full Cast Air cube pump and standard pump lineup. If you are deciding between a cube pump unit and a conventional reciprocating compressor, we can walk through the real-world trade-offs for your application. Free shipping, full manufacturer warranty, and honest pre-sale guidance on every order.
Call for pricing and availability.
Call 866-217-0063 for quick answers and help!
