The Castair PK60 is a 3.5 HP single-stage V-twin (V-2) cylinder bare pump with a 10" (1A-series) flywheel and 32 oz. oil capacity. This is the most powerful bare pump in the Cast Air single-stage lineup, designed for shops running air tools continuously or in high-cycle applications where the 2 HP PK50 cannot keep up with recovery demand. At 3.5 HP with a V-2 cylinder layout, the PK60 delivers the CFM needed to sustain impact wrench, air ratchet, and spray gun use without extended recovery wait times.
Note: Cast Air did not provide a dedicated manufacturer product page for this pump. Specifications are drawn from the product listing. Contact us to confirm CFM output, max PSI rating, and motor/electrical requirements for your specific application before ordering.
3.5 HP V-2 — Where It Fits in the Cast Air Lineup
The PK60 is the top of the Cast Air single-stage bare pump range. At 3.5 HP with a V-2 cylinder configuration, this pump requires a properly sized 3.5 HP electric motor (typically drawing 15-20 amps at 230V single-phase or equivalent). This is not a pump for residential 15-amp circuits — it requires a dedicated 20-30 amp 230V circuit or three-phase power if using a three-phase motor. Before purchasing the PK60, confirm your electrical service and motor can support the full 3.5 HP load during startup and sustained operation.
Why V-2 at 3.5 HP?
At higher horsepower, a single-cylinder pump creates large torque spikes on the crankshaft each compression stroke. These spikes cause vibration, uneven belt loading, and mechanical stress on the pump components. A V-2 design distributes the compression work across two cylinders — each cylinder fires on alternate half-revolutions — which smooths out the torque curve, reduces vibration, allows higher total displacement for the same crank speed, and extends the service life of bearings and drive components under continuous duty.
Pump Specification Details
- Part Number: PK60
- HP Rating: 3.5 HP
- Stage: Single stage
- Cylinders: 2 (V-2 configuration)
- Flywheel OD: 10" (1A-series flywheel)
- Oil Capacity: 32 oz.
- Drive: Belt drive
- Price: $432.74
Oil Maintenance at 32 oz. Capacity
The PK60 carries 32 oz. of oil — the largest sump in the Cast Air single-stage bare pump lineup. This larger crankcase supports the bearings and internal components of the V-2 design at 3.5 HP loads. Maintenance requirements:
- Check oil before every startup. A 3.5 HP V-2 pump running low on oil will fail quickly — crankshaft bearings and connecting rod bearings are the first casualties
- Change oil at Cast Air's specified interval (confirm with pump documentation or call us)
- Use compressor pump oil rated for Cast Air oil-lube pumps — not automotive engine oil
- Keep oil level within the marked range; overfilling causes oil contamination in the compressed air
When Does a Shop Need the PK60?
- Existing 3.5 HP V-2 Cast Air pump has failed and the motor and tank are still in service
- Building a heavy-duty shop compressor station where 2 HP (PK50) cannot maintain adequate pressure recovery between air tool cycles
- Running sustained air tool use — continuous impact wrench work, spray gun application, sustained die grinder use — where the compressor needs to keep up without extended recovery
- Multi-person shop where more than one air tool may run simultaneously
When to Step Down to PK50 or PK30
- If air tool use is intermittent (a tool runs for 30 seconds, tank recovers for 60 seconds), the 2 HP PK50 may be adequate and costs less
- If electrical service is limited to 115V or low-amperage 230V circuits, 3.5 HP may not be feasible without an electrical upgrade
- If the application is primarily inflation, blow-off, or other low-CFM tasks, the PK60 is more capacity than needed
Cast Air Bare Pump Comparison
- PK20 — 1.5 HP, 1-cylinder, 7.5" flywheel, 8 oz. — $194.81
- PK30 — 1.5 HP, 1-cylinder, 10" flywheel, 8 oz. — $241.01
- PK50 — 2 HP, V-2 cylinder, 10" flywheel, 16 oz. — $371.91
- PK60 — 3.5 HP, V-2 cylinder, 10" flywheel, 32 oz. — $432.74 (this unit) — highest output in the bare pump lineup
Technical Specifications
- Part Number: PK60
- Manufacturer: Cast Air (Castair)
- HP: 3.5
- Stage: Single stage
- Cylinders: 2 (V configuration)
- Flywheel OD: 10" (1A-series)
- Oil Capacity: 32 oz.
- Drive Type: Belt drive (flywheel included, belt not included)
- Price: $432.74
- CFM/PSI Rating: Not confirmed in listing — contact us for current performance data
- Electrical: Requires 3.5 HP motor — confirm motor, circuit, and panel capacity before ordering
- Manufacturer Data: Product page not available — specifications from product listing data
What Is Included
- 1x Castair PK60 V-2 bare pump with 10" flywheel
Motor (3.5 HP minimum), motor pulley, belt, tank (sized for 3.5 HP CFM output), pressure switch, safety valve, and connecting hardware are not included. Confirm motor HP, voltage, phase, and shaft diameter compatibility before purchasing.
Why Buy From Air Compressor Factory Direct?
A 3.5 HP V-2 pump replacement is one of the larger component purchases in the Cast Air lineup. Getting the motor, electrical service, and drive configuration right requires some confirmation work before you order. We have been selling Cast Air pump assemblies since 2016 and can walk through the full component and electrical requirements with you before you commit to the order. Free shipping, free tech support, full manufacturer warranty.
- Cast Air specialist since 2016
- Free shipping on all orders
- Free tech support — motor and electrical compatibility review before you order
- Full manufacturer warranty
- Application guidance — honest assessment of whether PK60 or PK50 is the right fit
Call 866-217-0063 for quick answers and help!
