DISTRIBUTOR-FIRST SUPPLY PARTNER · SINCE 1999 BRAND · CASTAIR
US-made cast-iron compressors built to buy once and fix rarely.
Buy once. Fix rarely.
CASTAIR has built cast-iron reciprocating air compressors in Spicer, Minnesota since 1991. The company is family-owned and operates with a single design philosophy: build compressors the way they used to be built — all cast iron, oil-lubricated, slow RPM — and make them serviceable by the people who own them.
The cast-iron pump is the core of CASTAIR's argument. Cast iron dissipates heat better than aluminum, tolerates thermal cycling without distorting bore geometry, and wears gradually rather than failing suddenly — which is why industrial-grade reciprocating compressors were built this way for a century before cost pressure pushed the market toward lighter, shorter-lived aluminum alternatives. CASTAIR runs its pumps at lower RPM than typical, which reduces heat, extends valve life, and makes the machine quieter. The result is a pump that is genuinely worth repairing rather than replacing.
Non-proprietary parts are a deliberate choice, not an afterthought. The distribution network can stock rebuild kits, rings, valves, and aftercooler components for CASTAIR units without going back to the factory for every service call — which keeps the total cost of ownership where it belongs and gives SPC a service-and-supply story that goes beyond the initial sale.
SPC carries the CASTAIR line direct as a Preferred channel partner, which means the spec you quote is the spec that ships — US-made cast-iron units from a stocking distributor who can also supply the non-proprietary replacement parts to keep them running.
CASTAIR's build philosophy is that a compressor should be worth repairing, not replacing.
Reciprocating, duplex, rotary screw, or a standalone aftercooler — SPC sizes the CASTAIR configuration to the duty cycle, pressure, and flow the application actually needs, not the box that was closest to budget.
General Manufacturing → Reliable simplex and duplex air for shop and plant applications with intermittent-to-continuous duty. 
Metalworking & Fabrication → Cast-iron compressor reliability for machining, welding, and fabrication shops. 
Automotive Manufacturing → Shop-duty reciprocating and rotary screw air for automotive service and light manufacturing. 
Construction & Infrastructure → Contractor-series portable cast-iron compressors for job-site compressed air. 
Woodworking & Furniture → Durable, low-maintenance shop air for woodworking operations. 
Agriculture & Food Production → Long-lived, field-serviceable compressors for agricultural shops and processing facilities. Intermittent shop use (air tools, occasional demand) suits the simplex reciprocating line. Continuous-duty production environments — where the compressor runs for extended periods without stopping — point to the CASTAIR CS Series rotary screw or a duplex D-Series reciprocating system with lead-lag alternation for even wear.
Where downtime is a cost — production lines, critical shop tools — the D-Series duplex provides lead-lag alternation on one horizontal receiver: one pump fails, the second keeps running. Size each pump to cover full plant demand so the backup is genuine, not partial.
CASTAIR aftercoolers (35–300 CFM) are quotable as part of a new package or as a standalone add-on when an existing system needs cooling or a failed aftercooler replaced. Cooling to within ~15°F of ambient removes the majority of condensate before the receiver and any downstream treatment.
Single-stage CASTAIR pumps reach ~175 PSI — adequate for most shop tools and general plant air. Two-stage pumps reach ~200 PSI for higher-pressure applications or for facilities that want the efficiency benefit of two-stage compression at lower pressures.
Tell us the spec and the account and we will come back with the right line, sourced through the distribution network.
—. We reply within one business day with pricing, lead-time, and configured parts.