Castair 35HP Commercial Air Compressor Horizontal Tank w/ Mounted Starter - C3513H60-S

Castair 35HP Commercial Air Compressor — Horizontal Tank with Mounted Starter (C3513H60-S)

The C3513H60-S is a heavy-duty 35HP cast iron air compressor built for high-demand commercial and industrial environments where a single-phase power source isn't an option. This is a two-stage, three-phase unit designed for shops that need sustained high-volume air output without the heat, noise, and maintenance overhead of rotary screw systems. The horizontal 60-gallon ASME tank keeps the footprint manageable in tighter equipment bays, and the factory-mounted magnetic motor starter means you're ready to wire and run — no sourcing a separate starter panel.

Note: Castair does not publish full spec sheets for the C3513H60-S on their public website. The specifications below are derived from the model number nomenclature (35HP, 1-phase/3-phase configuration, 60-gallon horizontal tank) and from Castair's published data for comparable models in the C-series pump lineup. Contact us or Castair directly for confirmed CFM, RPM, and dimensional data before ordering.

Who This Compressor Is For

A 35HP two-stage compressor is not an entry-level purchase. If you're looking at this unit, you're running a high-production shop — a busy automotive repair facility with multiple air-powered lifts, tire changers, and impact tools all running simultaneously, or a light industrial operation with continuous air demand. The 35HP rating indicates this compressor is designed to deliver sustained, high-CFM output at pressures up to 175 PSI without the thermal limitations of single-stage machines. The mounted magnetic starter is standard on Castair's commercial units at this power level because the motor draw at startup requires proper overload protection — not a standard pressure switch.

Cast Iron Pump — Why It Matters at This Power Level

Castair builds all of their commercial and industrial compressors around all-cast-iron pumps. At 35HP, this is non-negotiable. Aluminum pumps dissipate heat differently and have different expansion characteristics — in a compressor running at sustained high output, that matters for longevity. Castair's cast iron pumps run at slow RPM (typically 420-900 RPM depending on the pump configuration), which directly reduces heat generation, extends valve life, and lowers noise levels compared to high-RPM direct-drive designs.

Pump Design Features

• All cast iron construction: Cylinders, heads, and crankcase — no aluminum shortcuts
• Two-stage compression: First stage compresses to intermediate pressure, second stage brings it to working pressure — more efficient and cooler than single-stage at high PSI
• Slow RPM operation: Extended pump life, reduced heat, quieter than high-speed alternatives
• Tapered roller bearings: Both ends of the crankshaft for superior support and reduced friction
• Precision steel connecting rods: With automotive-type rod insert bearings at the crankshaft and needle bearings at the wrist pin
• Disc and spring valves: Easier to service than reed valves, higher efficiency, more reliable under continuous duty
• 4-ring pistons: Higher efficiency, less oil carry-over into the air stream
• Mechanical centrifugal unloader: Load-less start-up every time — the motor starts unloaded and the unloader engages as RPM builds

Tank and Frame Construction

60-Gallon Horizontal ASME Tank

• Horizontal configuration: Lower profile compared to vertical tanks — useful in shops with height restrictions or where the compressor needs to fit under a mezzanine or low ceiling
• ASME-rated tank: American Society of Mechanical Engineers code compliance for pressure vessel integrity
• Powder coat finish: Corrosion-resistant exterior
• Channel base: Standard on Castair horizontal tanks — welded steel channel frame for stable mounting
• ASME safety valve: Factory-installed pressure relief
• Copper discharge tube: Stronger and better heat dissipation than rubber hose connections
• Totally enclosed metal belt guard: OSHA-compliant, keeps debris out of the drive system

Electrical and Controls

Factory-Mounted Magnetic Motor Starter

The -S suffix means this unit ships with the magnetic motor starter factory-mounted and wired. At 35HP on three-phase power, a magnetic starter is required — the motor's inrush current at startup far exceeds what a standard pressure switch can handle. The factory installation saves you electrician time on-site; your electrician just needs to run the incoming three-phase feed to the starter enclosure.

• Three-phase motor: More efficient than single-phase at this power level, lower operating current for the same output, better suited for sustained commercial duty
• Full service factor motor: Castair's industrial motors carry a minimum 15% service factor — meaning the motor is rated to handle sustained loads above its nameplate HP without overheating
• Overload protection: Built into the magnetic starter

Available Configurations

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

Step down to 20-25HP if your shop runs 3-5 air tools intermittently and your compressor has idle time between cycles. The 20HP and 25HP industrial units from Castair (I20324HC4-S, I25324HC4-S) will handle most busy automotive shops at significantly lower purchase cost and operating expense.

This unit (35HP) makes sense when you're running 6-10 air tools simultaneously with near-continuous demand — production line work, large fleet maintenance operations, or shops with multiple lifts, air-powered equipment, and sandblasting all drawing at once. If your existing compressor is cycling constantly and never fully recharging between draws, you need more capacity.

Step up to 30HP with a larger tank (Castair's I30324HC4Z-S with 240-gallon tank) if you need both higher output AND larger reserve volume. More tank means more buffer between pump cycles.

Factory Options Available

• Low Oil Control (#6304M): Shuts down the compressor if oil level drops — prevents pump damage from running dry
• Hour Meter (#HRM460M for 460V): Track runtime for scheduled maintenance intervals
• Air Operated Auto Drain (#ADVSM): Automatic tank condensate drain
• Electronic Auto Drain (#SDV03M): Timer-controlled electronic drain valve
• Dual Control (#DC3): Allows switching between on/off and constant speed operation
• Intake Noise Silencers (#SA100x2M): Reduces intake noise at the pump
• Belt Tensioner Motor Base: Makes belt tension adjustment possible without removing the belt guard
• Beltguard Aftercooler (#BGAC3M): Cools compressed air before it enters the tank — important if you're using air tools sensitive to moisture
• Vibration Pads (#VP1004): Set of four 4x4x1-inch rubber isolation pads — recommended for all stationary installations
• Right From the Start Kit (#RFS003): Includes break-in oil, vibration pads, ball valve, flex hose, and air filter element — everything needed for proper installation

Technical Specifications

• Model: C3513H60-S
• Horsepower: 35HP
• Tank: 60-gallon horizontal, ASME-rated
• Phase: 3-phase
• Motor Speed: 1725 RPM (industrial motor)
• Pump Type: Two-stage cast iron, C-series
• Starter: Factory-mounted magnetic motor starter included
• Discharge: Copper discharge tube
• Belt Guard: Totally enclosed metal
• Manufacturer: Castair (castair.net)
• CFM and RPM: Contact us for confirmed specifications — not listed in Castair's public spec tables for this model

What's in the Box

• Assembled air compressor (pump, motor, tank, belt drive)
• Factory-mounted and wired magnetic motor starter
• Metal belt guard (totally enclosed)
• Copper discharge tube with unloader
• ASME safety valve
• Pressure switch
• Sight glass for oil level monitoring
• Note: Does not include vibration pads, flex hose, ball valve, or break-in oil — order Right From the Start Kit #RFS003 separately or add individual components

Why Buy From Air Compressor Factory Direct?

We specialize in commercial and industrial air compressors and have been helping shops select the right equipment since 2016. We carry the full Castair lineup — pumps, compressors, tanks, starters, and accessories — and can help you configure the right unit for your power supply, duty cycle, and shop layout. Free shipping on qualifying orders. Free technical support at 866-217-0063. Full manufacturer warranty. If this unit isn't the right fit, we'll tell you — we'd rather help you get the right compressor than sell you the wrong one.

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