Castair T10124HC2-S — 10 HP Single-Phase Tandem Air Compressor, 240-Gallon, Ultra-Quiet 420 RPM
The Castair T10124HC2-S is the top-tier 10 HP single-phase configuration in the Castair tandem lineup — 240-gallon horizontal tank combined with the slow 420 RPM pump configuration. At 420 RPM, these are the quietest cast iron pumps Castair builds. Paired with 240 gallons of air storage, this unit handles the most demanding single-phase shop applications: continuous spray operations, high-duty-cycle blast equipment, body shops running multiple tools simultaneously, and any operation that needs both maximum quiet operation and maximum air reserve from a single-phase power source.
This is not an entry-level purchase — at $9,012.30, the T10124HC2-S is a long-term infrastructure investment. The 420 RPM pump speed means these pump assemblies are physically larger and heavier than C1 units, which accounts for the 1,655 lb weight. If you are going to run this compressor for 20 years — which is entirely achievable with cast iron pumps at this speed — the investment makes sense.
Technical Specifications
- Model: T10124HC2-S
- Horsepower: 10 HP
- Phase: Single-phase (1-phase)
- Configuration: Tandem — 2 pumps, 1 motor, two-stage
- Pump RPM: 420 RPM (slowest configuration in the 10 HP tandem range)
- Tank: 240-gallon horizontal, ASME-certified
- Dimensions (LxWxH): 85 x 30 x 64 inches
- Weight: 1,655 lbs
- Motor Speed: 1,725 RPM industrial with 15% service factor
- Price: $9,012.30
Cast Iron Pump Construction
- All cast iron: Cylinders, heads, crankcase, and valve plates — cast iron throughout for heat dissipation and long service life
- Slow RPM operation: Lower speed means less heat, less noise, and longer life between rebuilds
- Tapered roller bearings: Both ends of each crankshaft for superior support and reduced friction
- Precision steel connecting rods: Automotive-type rod insert bearings at crankshaft and wrist pin for long service life
- Disc and spring valves: Stainless steel — approximately 10x the service life of standard reed valves, easy to service in the field
- 4-ring pistons: Better sealing, higher compression efficiency, less oil carry-over
- Centrifugal unloader: Load-free startup every time — the motor never has to start against tank pressure
Tank, Motor, and Controls
- Powder-coated ASME-certified horizontal tank with channel base
- ASME safety valves — code-compliant pressure relief installed
- Totally enclosed metal belt guard
- Copper discharge and unloader tubes
- Heavy-duty 1,725 RPM industrial motor with 15% service factor
- Magnetic motor starter: Mounted and wired from the factory (S designation)
What's Included
- Complete tandem compressor assembly (pumps, tank, motor, controls)
- Magnetic motor starter — factory mounted and wired
- Cast Air "Right from the Start" Kit
- ASME safety valve(s)
Why a Tandem vs. a Single-Pump Compressor
- Higher combined CFM output: Two pumps filling the tank simultaneously means faster recovery under continuous demand
- Redundancy: If one pump needs service, the other keeps running — a single-pump unit is either all or nothing
- Lower heat per pump: Neither pump runs at maximum stress — cooler operation extends pump life significantly
- Doubled pump service intervals: Runtime hours split between two pumps means each pump sees half the cycles
Shipping and Lead Time
These units ship within two weeks of order placement. Freight delivery time is additional and varies by location. All orders receive a courtesy call to confirm application requirements and ensure you have selected the correct configuration.
10 HP Tandem Lineup — Configuration Reference
- T10112HC1-S — 10 HP, 1-phase, 120 gal, 767 RPM ($6,560.05)
- T10112HC2-S — 10 HP, 1-phase, 120 gal, 420 RPM ($7,478.05)
- T10124HC1-S — 10 HP, 1-phase, 240 gal, 767 RPM ($8,023.75)
- T10124HC2-S — 10 HP, 1-phase, 240 gal, 420 RPM ($9,012.30)
- T10312HC1-S — 10 HP, 3-phase, 120 gal, 767 RPM ($5,660.75)
- T10312HC2-S — 10 HP, 3-phase, 120 gal, 420 RPM ($6,579.60)
- T10324HC1-S — 10 HP, 3-phase, 240 gal, 767 RPM ($7,194.15)
When Does a Shop Need the T10124HC2-S
This is the right unit when all of the following apply:
- You have single-phase power and cannot or prefer not to upgrade to three-phase
- You need maximum air storage — 240 gallons handles sustained high-CFM demand
- Noise is a genuine constraint — 420 RPM is measurably quieter than 767 RPM in enclosed spaces
- You are making a 10–20 year infrastructure investment and want the lowest-stress pump configuration for maximum service life
Choose the T10124HC1-S instead when: The 767 RPM pump noise level is acceptable and the $988 price difference is meaningful.
Consider the T10324HC1-S when: You have or can upgrade to three-phase power — a 3-phase 240-gallon 767 RPM unit at $7,194.15 is $1,818 less than this configuration.
Why Buy From Air Compressor Factory Direct?
- Authorized Cast Air dealer since 2016
- Free shipping included on this order
- Free technical support at 866-217-0063 — call before ordering to confirm phase, tank size, and CFM requirements for your application
- Full Cast Air manufacturer warranty
- Honest guidance: If a different configuration fits your shop better, we will tell you
Call 866-217-0063 for quick answers and help!
