Castair I10312HC2-S

Castair I10312HC2-S — 10 HP Three-Phase Industrial Air Compressor, 120-Gallon Horizontal Tank, C2 Pump

The Castair I10312HC2-S (SKU: I10312HC2) is a 10 HP three-phase industrial air compressor with a 120-gallon horizontal ASME tank and C2 cast iron two-stage pump at 758 RPM. Output: 45.0 CFM at 0 PSI, 35.0 CFM at 175 PSI. Weight: 860 lbs at 69 x 24 x 50 inches. Three-phase motor means cooler running, lower starting current, and better suitability for continuous industrial duty than single-phase equivalent.

Starter configuration: Confirm at time of order whether this SKU ships with factory-mounted starter — call 866-217-0063. The I10312HC2-S designation with starter is also available.

Cast Iron Pump Engineering — Why This Matters for Shop Longevity

Every Castair Industrial Series compressor is built around their oversized cast iron pump. Here is what separates these from lighter-duty machines:

• All cast iron construction — cylinder heads, crankcase, and cylinders are cast iron throughout. Cast iron manages heat better than aluminum and wears far more slowly under continuous load.
• Tapered roller bearings at both ends of the crankshaft — not ball bearings. Tapered rollers handle both radial and thrust loads simultaneously, which is exactly what a reciprocating pump crankshaft sees in operation.
• Precision steel connecting rods with automotive-type insert bearings — at both the crankshaft journal and the wrist pin. These are the same bearing design used in automotive engines. They are replaceable when worn — not a throwaway assembly.
• Disc and spring valves — simpler to service than reed valves, more efficient at high discharge pressures, and more reliable over years of cycling.
• 4-ring pistons — two extra rings versus typical 2-ring piston designs. Better compression sealing, significantly less oil carry-over into the air stream.
• Centrifugal unloader — the pump starts unloaded on every cycle without exception. This reduces motor starting current, reduces wear on the motor and belts, and eliminates the hard-start problem common in compressors that attempt to restart against pressure.

Tank, Motor, and Controls

• ASME-coded steel tank — powder-coated for corrosion resistance. ASME certification means the tank was designed and tested to a recognized pressure vessel standard, not just stamped with a number.
• ASME safety valve — factory-installed.
• Metal belt guard, totally enclosed — not a plastic cover.
• Copper discharge and unloader tubing or stainless-steel braided flex line — not plastic hose or rubber.
• Heavy-duty 1,725 RPM industrial motor with a minimum 15% service factor. This means the motor can sustain loads above its nameplate rating without tripping. In a shop where the compressor runs all day, the service factor is not a marketing number — it is the difference between a motor that lasts a decade and one that burns up in two years.

Three-Phase Advantage

• Lower inrush current on startup versus single-phase
• Cooler motor operation under sustained load
• Better long-term reliability in continuous-duty service
• 15 lbs lighter than single-phase equivalent (860 lbs vs. 875 lbs)

Technical Specifications

• Model: I10312HC2-S
• Horsepower: 10 HP
• Phase: 3-phase (three-phase)
• Tank capacity: 120 gallons
• Tank orientation: Horizontal (channel base)
• Pump type: C2 (two-stage cast iron)
• Pump RPM: 758
• CFM at 0 PSI: 45.0
• CFM at 175 PSI: 35.0
• Max working pressure: 175 PSI
• Motor speed: 1,725 RPM
• Dimensions (L x W x H): 69 x 24 x 50 inches
• Weight: 860 lbs
• Tank certification: ASME
• Manufacturer: Castair (Cast Air Inc., Spicer, MN)

Available Configurations — Cast Air Industrial 10 HP Three-Phase Lineup

Single-phase versions (I101-series) are available if your facility only has single-phase 230V service.

Why Buy From Air Compressor Factory Direct?

We have been selling industrial air compressors since 2016 and carry the full Cast Air Industrial Series lineup. When you call us, you reach someone who can tell you whether the C2 or C3 pump is right for your application, what electrical service you need, which options are worth adding, and whether horizontal or vertical tank orientation fits your floor plan. We offer free shipping on qualifying orders, full manufacturer warranty support, and straight talk about which unit fits your shop — not a push toward the most expensive option.

Call 866-217-0063 for quick answers and help!