Cast Air Industrial Series Heavy Duty Shop Air Compressor — Model I538HC1-S
The Cast Air I538HC1-S is a 5 HP, 80-gallon horizontal industrial air compressor at ,404. The 3-cylinder pump designation marks this as a higher-displacement pump than standard 5 HP alternatives — the same 5 HP motor driving more pump cylinders means more CFM output and faster tank recovery compared to single or dual-cylinder pumps at this horsepower level.
For small shops that run tools more continuously than intermittently, the 3-cylinder pump at 5 HP gives meaningfully more air volume per minute than a typical 5 HP compressor. More cylinders, more air — even with the same motor horsepower.
Who This Compressor Is For
- Single-technician shops running tools more or less continuously throughout the workday — the 3-cylinder pump handles sustained demand better than 2-cylinder alternatives
- Shops where the current compressor cycles too frequently under single-user load — the higher displacement pump addresses that without requiring a bigger motor
- Light service operations needing maximum CFM output from a 5 HP single-phase unit
- Operations with limited electrical service where a larger motor isn't possible but higher CFM output is needed
Key Features
- 5 HP Single-Phase Motor: Low electrical requirement — approximately 22–28A at 230V; works on standard single-phase shop electrical service
- 80-Gallon Horizontal Tank: Adequate storage for sustained single-user operation with reduced cycling frequency
- 3-Cylinder Cast Iron Pump: Higher displacement than standard 5 HP pumps — more air moved per revolution means higher CFM output and faster pressure recovery after tool use
- Single-Stage Compression: Straightforward, reliable compression for standard shop working pressures
- Industrial Series Build: Commercial-grade construction — not a consumer or contractor unit
- Horizontal Configuration: Lower center of gravity, stable installation, straightforward condensate drainage
Why 3 Cylinders at 5 HP?
At any given horsepower, a 3-cylinder pump displaces more air per revolution than a 2-cylinder pump. The motor works the same amount — but it's moving more pump volume per stroke. The result is more CFM at the same HP rating. For shops where the compressor's CFM output (not its maximum pressure) is the limiting factor — where tools slow down or pressure drops during sustained use — the 3-cylinder pump at 5 HP is a meaningful upgrade over standard 5 HP configurations without requiring any electrical upgrade.
Understanding the I538HC1 Model Number
- I — Industrial Series
- 5 — 5 HP motor
- 3 — 3-cylinder pump
- 8 — 80-gallon tank
- HC — Horizontal Cast iron pump
- 1 — Single-stage compression
5 HP Horizontal Options Compared
- I518HC1-S — ,356 — 5 HP, 80-gal, standard cylinder count, horizontal, single-stage
- I538HC1 (this unit) — ,404 — 5 HP, 80-gal, 3-cylinder, horizontal, single-stage — higher CFM for similar price
- I538VC2-S — ,642 — 5 HP, 80-gal, 3-cylinder, vertical, 2-stage
Installation Requirements
- Electrical: Single-phase 230V — 5 HP draws approximately 22–28A; 30A dedicated circuit typically sufficient
- Floor: Level concrete for permanent stationary installation
- Clearance: Adequate ventilation clearance on all sides
- Condensate: Regular horizontal tank draining
Note: Exact CFM output, maximum operating PSI, dimensions, and shipping weight were not available from Cast Air's manufacturer website at time of listing. Contact us at 866-217-0063 for current specifications before ordering.
Why Buy From OEM Diagnostic Tools?
OEM Diagnostic Tools has supplied professional shop equipment since 2016. We'll help you understand whether the 3-cylinder pump makes a meaningful difference for your specific tool use pattern before you commit. Free shipping, free pre-sale technical support at 866-217-0063, and the full Cast Air manufacturer warranty.
Call 866-217-0063 for quick answers and help!
