Castair I518HC1: 5HP Single-Phase Industrial Air Compressor — 80 Gallon Horizontal with Aftercooler (Base, Starter Variant)
The Castair I518HC1 is a 5-horsepower, single-phase, 80-gallon horizontal industrial air compressor with the C1 cast iron pump and aftercooler. This SKU (I518HC1) in our database corresponds to the I518HC1-S configuration — the C1 pump with aftercooler on an 80-gallon horizontal tank.
At 767 RPM, 22.0 CFM free air delivery, and 17.5 CFM at 175 PSI, this is sized for a 1-2 technician shop running standard pneumatic tools. The aftercooler (BGAC1M, belt guard mounted, 35 CFM rated) is the key differentiator from the base I513HC1 series — it cools compressed discharge air before it enters the tank, reducing moisture carryover to your air lines, tools, and downstream processes.
Single-phase power makes this accessible to any shop with standard electrical service — no phase converter, no 3-phase utility requirement. The 80-gallon horizontal tank fits in low-ceiling locations where a vertical tank would not clear.
Specifications
C1 Pump
- Pump designation: C1 — Two-stage, Inline 2 cylinder
- Rated HP range: 4-7.5HP
- Pump RPM: 767
- Oil capacity: 2 quarts
- Construction: 100% cast iron — cylinders, heads, valve plates, crankcase
- Bearings: Tapered roller bearings at both crankshaft ends
- Connecting rods: Precision steel with automotive-type rod insert bearings
- Valves: Disc and spring — field-replaceable
- Pistons: 4-ring configuration
- Unloader: Centrifugal — loadless start-up every cycle
Aftercooler
- Part number: BGAC1M — belt guard mounted, 35 CFM rated
- Function: Cools compressed discharge air, condenses moisture before tank entry
- Benefit: Drier air delivered downstream — important for spray painting, sandblasting, and moisture-sensitive pneumatic tools
Tank and Motor
- Tank capacity: 80 gallons, horizontal
- Tank construction: Powder-coated ASME-rated steel
- Safety valve: ASME-rated, factory installed
- Horsepower: 5HP
- Phase: Single-phase
- Motor speed: 1725 RPM industrial
- Service factor: 15% minimum
- Max working pressure: 175 PSI
Performance Specifications
- Motor output: 5 HP, single-phase
- Tank capacity: 80 gallons, horizontal
- Pump: C1 (Two-stage, Inline 2), 767 RPM
- Free air delivery (0 PSI): 22.0 CFM
- Delivery at 175 PSI: 17.5 CFM
- Max pressure: 175 PSI
- Dimensions (LxWxH): 64 x 20 x 48 inches
- Weight: 600 lbs
What's in the Box
- Castair compressor — fully assembled on 80-gallon horizontal tank
- BGAC1M belt guard mounted aftercooler (35 CFM)
- ASME safety valve (factory installed)
- Pressure switch with unloader
- Totally enclosed metal belt guard
- Copper discharge and unloader tubing
- Owner's documentation
Call us at 866-217-0063 to confirm starter inclusion and current configuration details for this SKU before ordering.
When Does a Shop Need This?
- 1-2 technician shop on single-phase power where aftercooler-treated air is required for spray work or moisture-sensitive applications
- Low-ceiling installations where a vertical tank is not practical
- Shops running body work, detail operations, or sandblasting alongside general air tool use
Why Buy From Air Compressor Factory Direct?
We have specialized in industrial air compressors and shop equipment since 2016. We can confirm current configuration specs, lead times, and options for any Castair unit before you order. Call us — a 5-minute conversation saves a lot of confusion.
- Free shipping to commercial addresses in the lower 48 states
- Free tech support at 866-217-0063
- Full Castair manufacturer warranty
- Authorized dealer with direct Castair factory support
Call 866-217-0063 for quick answers and help!
