Cast Air Heavy Duty Shop Tandem Air Compressor — T25312HC2-S
The T25312HC2-S puts two 25 HP motors on the HC2 cast iron pump platform at 710 RPM, paired with a 120-gallon horizontal ASME tank. Combined output is 218 CFM at 0 PSI and 180 CFM at 175 PSI. At $8,292, this is the most economical entry point into 25 HP tandem territory — you get serious production-level CFM output on a compact 120-gallon footprint. This compressor is built for high-throughput collision repair, large fleet maintenance bays, automotive dealership service departments, and any shop where sustained high air demand is the daily reality. At 180 CFM sustained at 175 PSI, every tool in a 10-bay shop can run simultaneously without pressure starvation.
What 180 CFM at 175 PSI Handles
- Equivalent to running approximately 36 impact wrenches simultaneously at 5 CFM each
- Supports 12+ DA sanders running full-speed at 14 CFM each
- Runs multiple spray guns, plasma cutters, and air-powered equipment across a large facility without pressure drop
- Provides genuine headroom — you are not at the machine's limit, which means pressure stays stable and tools perform at rated spec
Cast Iron Pump Features
- All cast iron construction: Cylinders, heads, and crankcase on both 25 HP pump assemblies.
- 710 RPM (HC2 configuration at 25 HP): Slow-speed operation for reduced noise, lower operating temperature, and extended service life compared to high-speed import equipment.
- Tapered roller bearings: Both ends of each crankshaft. Required for sustained high-load operation at this horsepower level.
- Precision steel connecting rods: Automotive-type rod insert bearings at the crank, needle bearings at the wrist pin.
- Disc and spring valves: Field-serviceable. Simple to inspect and rebuild in the field without specialized tooling.
- 4-ring pistons: Higher efficiency and less oil carry-over into the discharge air.
- Centrifugal unloader: Loadless start every cycle. At 50 HP total motor power, the centrifugal unloader prevents the high inrush current that damages contactors and motor insulation over time.
Tank and Controls
- 120-gallon horizontal ASME tank: Powder-coated, channel base. At 180 CFM of output, this pump configuration recovers the 120-gallon tank quickly. The 240-gallon version (T25324HC2-S) is the better choice if your demand has significant short-burst spikes.
- Two magnetic motor starters — mounted and wired: Factory-installed on both pump sides. Connect to 3-phase service and operate.
- ASME safety valves: Factory-set on both sides.
- Metal belt guards: Fully enclosed on both pump assemblies.
- Copper discharge and unloader tubes: Copper throughout the hot side of both assemblies.
- 1,725 RPM industrial motors: 15% service factor or higher on both 25 HP motors.
Available Factory-Mounted Options
- Low Oil Control (#6304x2M): Automatic oil-level shutdown on both pumps.
- Hour Meter 230V (#HRM75x2M) or 460V (#HRM460x2M): Independent runtime tracking per pump.
- Alternator Relay (#ALT230M or #ALT460M): Alternates lead pump each cycle to equalize wear.
- Electronic Auto Drain (#SDV03M): Timed solenoid condensate drain.
- Dual Control (#DC2x2M): Start/stop and throttle control modes.
- Intake Noise Silencers (#SA100x4M): Reduces intake noise on both pumps.
- Aftercooler (#BGAC2x2M, 100 CFM rated for 25 HP units): Belt-guard-mounted aftercooler sized for the higher output of the 25 HP configuration.
- All Options Package (#AOC2D): All asterisk options at 10% off combined price.
What Is in the Box
- Two cast iron two-stage HC2 pump and motor assemblies (25 HP each) on a single rigid frame
- 120-gallon horizontal powder-coated ASME tank with channel base
- Two magnetic motor starters, mounted and wired at the factory
- Two ASME safety valves
- Two metal belt guards (fully enclosed)
- Copper discharge and unloader tubes on both sides
- Pressure switch for each pump
Optional accessories are factory-installed at time of order and are not included unless specified at purchase.
Available Configurations — 25 HP Shop Tandem Lineup
- T25312HC2-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 120-gal — $8,292 (this unit)
- T25312HC3-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 120-gal — $10,924 (larger/slower pump)
- T25324HC2-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 240-gal — $9,826
- T25324HC3-S: 2×25 HP, 710 RPM, 218 CFM / 180 CFM @ 175 PSI, 240-gal — $12,458
When Does a Shop Need This vs. Stepping Up or Down?
- Step down to 20 HP tandem: If your sustained demand is under 140 CFM, the T20312HC2-S at $7,974 handles it with the same platform architecture for less money. The 25 HP step-up is for shops that genuinely use 140+ CFM on a regular basis.
- This unit is right when: You operate a large collision center, a high-volume fleet maintenance facility, or any production environment where multiple high-demand processes run simultaneously. 180 CFM at working pressure runs a serious shop with meaningful headroom.
- Step up to HC3 or 240-gallon: If your compressor runs all day without significant off time, the T25312HC3-S ($10,924) provides the HC3 pump's longer service intervals. If demand spikes are the issue, the T25324HC2-S ($9,826) adds 120 gallons of buffer storage.
Technical Specifications — T25312HC2-S
- Model Number: T25312HC2-S
- Horsepower: 2 × 25 HP (50 HP total)
- Phase: 3-phase
- Pump RPM: 710 (HC2 configuration)
- CFM @ 0 PSI: 218 (combined, both pumps)
- CFM @ 175 PSI: 180 (combined, both pumps)
- Tank Capacity: 120 gallons, horizontal
- Tank Type: ASME-certified, powder-coated, channel base
- Motor Speed: 1,725 RPM, 15% service factor
- Pump Type: Two-stage, all cast iron, centrifugal unloader
- Controls: Two magnetic motor starters, mounted and wired
- Discharge Tubing: Copper
- Belt Guard: Metal, fully enclosed
- Price: $8,292.35
Note: Exact LxWxH dimensions and shipping weight for this configuration are not individually published by Castair. Contact us for freight details before ordering.
Why Buy From Air Compressor Factory Direct?
We have specialized in industrial air compressor sales since 2016. At the 25 HP tandem level, we can help you determine whether the HC2 or HC3 pump, and whether 120 or 240-gallon storage, actually fits your operation — before you commit to a $8,000–12,000 purchase.
- Free shipping to a commercial address with a loading dock or forklift
- Free tech support at 866-217-0063 — call before you buy to confirm the right configuration for your shop's actual demand
- Full Cast Air manufacturer warranty — handled directly through us
- Honest guidance: We carry the full tandem lineup and will tell you if a different model fits better.
Call 866-217-0063 for quick answers and help!
