Castair T10112HC1-S — 10 HP Single-Phase Tandem Air Compressor, 120-Gallon Horizontal
The Castair T10112HC1-S is a 10 horsepower, single-phase, two-stage tandem piston air compressor with a 120-gallon horizontal ASME tank. This is a shop compressor built for continuous heavy-duty use — the kind of unit that runs all day in a diesel bay, body shop, or fleet maintenance facility without issues. The tandem configuration means two cast iron pumps operating off a single motor, sharing the workload and delivering more total air output than a single-pump 10 HP unit while maintaining the continuous duty rating your shop demands.
Single-phase power is a significant factor in compressor selection for many shops — three-phase infrastructure requires electrical upgrades that add cost and lead time. The T10112HC1-S delivers 10 HP of compressor capacity on standard single-phase power, making it the practical choice for shops with single-phase electrical service that need serious air output.
Technical Specifications
- Model: T10112HC1-S
- Horsepower: 10 HP
- Phase: Single-phase (1-phase)
- Configuration: Tandem — 2 pumps, 1 motor
- Stage: Two-stage compression
- Pump RPM: 767 RPM
- Tank: 120-gallon horizontal, ASME-certified
- Dimensions (LxWxH): 85 x 28 x 57 inches
- Weight: 1,115 lbs
- Motor Speed: 1,725 RPM industrial with 15% service factor
- Price: $6,560.05
Cast Iron Pump Construction — Why It Matters
Castair has been building compressors since 1991 with one core principle: cast iron pumps, not aluminum. Cast Air pumps are oil-lubricated, not oil-less, and run at very slow RPMs. This combination means quieter operation, better heat dissipation, and a service life measured in decades rather than years. Here is what is inside every Castair tandem pump:
- All cast iron construction: Cylinders, heads, crankcase, and valve plates — cast iron throughout for superior heat dissipation and durability
- Slow RPM operation: Operating at 420 or 767 RPM depending on configuration — far slower than competitive units. Less heat, less noise, less wear per cycle
- Tapered roller bearings: At both ends of each crankshaft for superior load support and reduced friction under the continuous operation these machines see
- Precision steel connecting rods: Automotive-type rod insert bearings at the crankshaft and needle bearings at the wrist pin — designed for long service intervals
- Disc and spring valves: Stainless steel disc and spring valves provide approximately 10x the service life of standard reed valves — easier to service and more efficient under load
- 4-ring pistons: Better sealing, higher compression efficiency, and less oil carry-over into the air supply
- Centrifugal unloader: Load-free startup every time — the compressor never has to start against tank pressure
Tank, Motor, and Controls
- Powder-coated ASME-certified tank: Horizontal configuration with channel base mounting
- ASME safety valves: Code-compliant pressure relief
- Totally enclosed metal belt guard
- Copper discharge and unloader tubes
- Heavy-duty 1,725 RPM industrial motor with full 15% service factor
- Magnetic starter included (S designation): Motor control fully wired and mounted from the factory
What's Included
- Complete tandem compressor unit (pumps, tank, motor, controls)
- Magnetic motor starter — mounted and wired
- Cast Air "Right from the Start" Kit — everything needed for initial setup and first-day operation
- ASME safety valve(s)
- Copper discharge and unloader tubing
Why a Tandem vs. a Single-Pump Compressor
A tandem compressor runs two separate pump assemblies from a single motor on a shared tank. This design offers real operational advantages that a comparably rated single-pump unit cannot match:
- Higher combined CFM output: Two pumps filling the same tank simultaneously means faster recovery and more sustained air delivery under continuous demand
- Built-in redundancy: If one pump needs service, the other continues operating — a single-pump compressor is either running or completely down
- Lower heat per pump: Neither pump runs at maximum stress continuously — the shared workload runs cooler and extends pump life
- Extended pump service intervals: Runtime hours are split across two pumps — maintenance intervals per pump are effectively doubled
Shipping and Lead Time
These units ship within two weeks of order placement. Note that shipping means leaving the warehouse within two weeks — freight delivery times vary by location and are in addition to the lead time. All orders receive a courtesy call to confirm application requirements and verify the correct unit has been selected for your shop.
T10112HC1-S vs. Other 10 HP Tandem Configurations
The 10 HP tandem line offers multiple configurations. Here is where the T10112HC1-S fits:
- T10112HC1-S (this unit) — 10 HP, 1-phase, 120 gal, 767 RPM ($6,560.05). Faster pump speed, smaller tank, single-phase power
- T10112HC2-S — 10 HP, 1-phase, 120 gal, 420 RPM ($7,478.05). Slower, quieter pump, more air volume per stroke, same tank
- T10124HC1-S — 10 HP, 1-phase, 240 gal, 767 RPM ($8,023.75). Larger tank for high-demand applications needing more air reserve
- T10124HC2-S — 10 HP, 1-phase, 240 gal, 420 RPM ($9,012.30). Largest single-phase configuration with maximum storage
- T10312HC1-S — 10 HP, 3-phase, 120 gal, 767 RPM ($5,660.75). Three-phase version at lower price
- T10312HC2-S — 10 HP, 3-phase, 120 gal, 420 RPM ($6,579.60). Three-phase with slower pump
- T10324HC1-S — 10 HP, 3-phase, 240 gal, 767 RPM ($7,194.15). Three-phase with large tank
When Does a Shop Need the T10112HC1-S
This unit is the right choice when:
- You have single-phase electrical service and need 10 HP of compressor capacity — no three-phase upgrade required
- Your shop runs 2–4 bays with consistent, high-demand air use — impact wrenches, air ratchets, tire equipment, spray guns
- You want a 120-gallon tank with faster pump recovery rather than a larger tank with slower recovery
- Budget versus a 240-gallon configuration is a consideration — this is the entry point in the 10 HP 1-phase tandem lineup
Step up to the T10112HC2-S when: You want slower, quieter pump operation (420 RPM vs. 767 RPM) — the C2 configuration runs more quietly and with less heat per stroke, at a higher price point.
Step up to the T10124 series when: Your air demand requires more than 120 gallons of tank storage — high-duty-cycle spray operations, sandblasting, or running multiple tools simultaneously for extended periods.
Consider the T10312HC1-S when: You have three-phase electrical service and want to save on the unit price — three-phase motors are more efficient and the 3-phase version is $900 less.
Why Buy From Air Compressor Factory Direct?
- Authorized Cast Air dealer since 2016 — we know the lineup and can help you choose the right tank size, phase, and pump speed for your specific shop
- Free shipping on this order — freight included to your location
- Free technical support at 866-217-0063 — call before ordering to confirm phase requirements, tank sizing, and CFM needs for your application
- Full Cast Air manufacturer warranty on every component
- Honest buying guidance: If a different HP or configuration is a better fit, we will tell you before you order a $6,000+ compressor
Call 866-217-0063 for quick answers and help!
