Castair 35HP Commercial Air Compressor Horizontal Tank - C3513H60

Castair 35HP Commercial Air Compressor — Horizontal Tank (C3513H60)

The C3513H60 is a 35HP, three-phase, two-stage all-cast-iron air compressor on a 60-gallon horizontal ASME tank. This is the base configuration — no factory-mounted magnetic motor starter. The horizontal tank keeps the profile low, which is useful in shops with overhead constraints. If you want the starter pre-mounted and wired at the factory, order the C3513H60-S instead. At 35HP, this unit is designed for high-production commercial and light industrial environments with sustained simultaneous air demand.

Spec note: Castair does not publish complete spec tables for the C3513H60 on their public website. The data below is derived from Castair model naming conventions and comparable C-series pump units. Contact us or Castair for confirmed CFM, RPM, and dimensional specs before ordering.

Who This Is For

This is not an entry-level compressor. A 35HP two-stage unit is built for shops running 6-10 air tools simultaneously at sustained demand — large automotive service operations, fleet maintenance facilities, or light manufacturing lines. Three-phase power at this HP level is more efficient than single-phase, draws lower current per leg, and is standard in commercial electrical installations. If your shop has three-phase service and needs consistent high-volume air, this is the right category of machine.

Cast Iron Pump Design

• All cast iron pump construction: Cylinders, heads, crankcase — full cast iron throughout
• Two-stage compression: First stage to intermediate pressure, second stage to 175 PSI working pressure — thermally efficient at high PSI
• Slow RPM operation: Extended pump and valve life, lower heat generation, quieter than high-speed designs
• Tapered roller bearings: Both ends of the crankshaft — superior support and reduced friction
• Precision steel connecting rods: Automotive-type rod insert bearings at crankshaft, needle bearings at wrist pin
• Disc and spring valves: Easy to service, high efficiency, reliable under sustained cycling
• 4-ring pistons: Higher compression efficiency, reduced oil carry-over into the air stream
• Mechanical centrifugal unloader: Motor starts fully unloaded — compression begins only as RPM reaches operating speed

60-Gallon Horizontal ASME Tank

• Horizontal layout: Low profile — fits in bays with overhead obstructions or where vertical height is limited
• ASME pressure vessel rating: Code-compliant for commercial and industrial installation
• Powder coat finish: Corrosion-resistant exterior
• Channel base: Welded steel channel frame — standard on Castair horizontal tanks
• ASME safety valve: Factory-installed pressure relief
• Copper discharge and unloader tube: More durable and better heat dissipation than rubber hose connections
• Totally enclosed metal belt guard: OSHA-compliant, protects belt drive from contamination

Electrical — No Starter Included

At 35HP three-phase, a magnetic motor starter is required for operation — the motor's inrush current at startup requires proper overload protection that a standard pressure switch cannot provide. This unit ships without a starter. You need to supply and install a starter rated for the motor's HP and voltage. See Castair's magnetic starter catalog or call us to confirm the correct starter part number for your installation voltage (208/230V 3-phase or 460V 3-phase).

Available Configurations

When Does a Shop Need This vs. Stepping Up or Down?

Step down to 20HP or 25HP (Castair I20324HC4-S or I25324HC4-S) if your shop doesn't run simultaneous heavy air demand. The 25HP unit delivers 109 CFM @ 0 PSI with a 240-gallon tank — often more practical for high-volume automotive shops because the larger tank buffer means fewer pump cycles.

This unit is the right fit for production environments where compressor cycling is a current problem and you need more sustained output.

Step up to a duplex configuration if redundancy matters — two motors, two pumps, one tank, with an alternator so one unit can cover if the other needs service.

Factory Options

• Low Oil Control (#6304M): Shuts down the compressor if oil drops to unsafe levels
• Hour Meter: Track runtime for scheduled maintenance
• Auto Drain (#ADVSM or #SDV03M): Air-operated or electronic condensate drain
• Dual Control (#DC3): On/off plus constant speed operation
• Intake Silencers (#SA100x2M): Reduces pump inlet noise
• Beltguard Aftercooler (#BGAC3M): Cools compressed air before it enters the tank
• Vibration Pads (#VP1004): Set of four 4x4x1" rubber isolation pads
• Right From the Start Kit (#RFS003): Break-in oil, vibration pads, ball valve, flex hose, air filter element

Technical Specifications

• Model: C3513H60
• Horsepower: 35HP
• Tank: 60-gallon horizontal, ASME-rated
• Phase: 3-phase
• Pump Type: Two-stage cast iron, C-series
• Starter: Not included
• Discharge: Copper tube with unloader
• Belt Guard: Totally enclosed metal
• CFM/RPM/Dimensions: Contact us — not in Castair's public spec tables for this model

What's in the Box

• Assembled compressor unit (pump, motor, horizontal tank, belt drive)
• Totally enclosed metal belt guard
• Copper discharge tube with unloader
• ASME safety valve and pressure switch
• Oil sight glass
• Not included: Magnetic motor starter, vibration pads, flex hose, ball valve, break-in oil

Why Buy From Air Compressor Factory Direct?

We have specialized in commercial and industrial air compressors since 2016. We carry the full Castair lineup — compressors, pumps, tanks, starters, and accessories — and can help you confirm specs and select the right configuration for your application. Free shipping on qualifying orders. Free technical support at 866-217-0063. Full manufacturer warranty. If this unit isn't the right fit for your power supply or duty cycle, we'll tell you.

Call 866-217-0063 for quick answers and help!