The Castair G3516VS75 is a 3.5 HP single-stage electric air compressor with a 60-gallon vertical tank, running on 230V single-phase at 15 amps. It delivers 18.6 CFM free air delivery and 11.5 CFM at 100 PSI, shutting off at 125 PSI. This is the serious unit in Castair's Garage Series — a 60-gallon vertical with real output for shops that run air tools continuously throughout the day. At 250 lbs shipped weight and 31" x 27" x 70" overall dimensions, it requires a dedicated 230V circuit and a permanent installation location.
Who This Compressor Is For
The G3516VS75 is for shops that have outgrown 115V compressors and need sustained output for real shop work. At 11.5 CFM at 100 PSI, it can support continuous use of air ratchets, impact guns, blow guns, and moderate spray work without the pump cycling constantly. The 60-gallon vertical tank provides substantial stored volume. The 230V/15A requirement is the key constraint — if your shop does not have a 230V circuit available, this is not the right unit regardless of the output specs.
This compressor uses an inline twin pump configuration at 1,100 RPM — a slow, quiet pump RPM that contributes to long pump life and lower noise versus high-RPM alternatives.
Key Specifications
- Model: G3516VS75
- Motor: 3.5 HP
- Stage: Single
- Tank Capacity: 60 gallons, vertical style
- Pump Configuration: Inline twin (single-stage)
- Pump RPM: 1,100
- Free Air Delivery (0 PSI): 18.6 CFM
- Delivery at 100 PSI: 11.5 CFM
- Cutout Pressure: 125 PSI (factory set, single-stage)
- Voltage / Amperage: 230V / 15 amps
- Dimensions (L x W x H): 31" x 27" x 70"
- Shipped Weight: 250 lbs
- Motor Type: 1-phase, 3,450 RPM motor with overload protection
- Starter: No magnetic starter required
Pump and Unit Features
- Inline twin pump, single-stage: Two cylinders in line configuration; runs at 1,100 RPM for quieter, cooler, longer-lasting operation
- Oil-lubricated cast iron construction: Cast iron pump throughout — Castair's core differentiator versus aluminum or plastic pump alternatives
- Automotive-type paper element intake filter: Filters and silences the intake on both cylinders
- Ball bearing main bearings: Automotive-type ball bearings at the crankshaft for superior support versus sleeve bearings
- Easy-read oil sight glass: Oil level visible at a glance
- Powder-coated ASME 60-gallon vertical tank: ASME-rated; powder-coated for corrosion resistance
- Copper discharge and unloader tube: Heat dissipation and strength superior to steel tube at this application
- Bleeder pressure switch: Unloaded start — motor starts without compression load every cycle
- Overload protection: Built into the motor; no magnetic starter required
- Four feet on stationary base: Stable four-point floor contact
- Rigid metal belt guard: Protects belt and pulley
Garage Series Lineup
- G15115VP30 — 1.5 HP, 15-gal v-port, 115V/12A, 4.8 CFM @ 100 PSI, 150 lbs shipped
- G212P50 — 2 HP, 20-gal portable, 115V/15A, 6.5 CFM @ 100 PSI, 175 lbs shipped
- G3516VS75 — 3.5 HP, 60-gal vertical, 230V/15A, 11.5 CFM @ 100 PSI, 250 lbs shipped (this model)
When Does a Shop Need This vs. Stepping Up or Down
- G3516VS75 is the right choice if: you have 230V single-phase available, you need 11.5 CFM at 100 PSI for sustained tool use, and you want a permanent shop compressor with a 60-gallon tank
- Step down to G212P50 if: you only have 115V available, or portability matters — you give up 5 CFM at 100 PSI but gain 115V operation
- Step up to Commercial Series (C513HA8 and up) if: you run air tools all day at high demand — the Commercial Series offers 5 HP motors, 15% service factor, precision steel connecting rods, and disc-and-spring valves for higher-duty-cycle applications. Those start at 230V/22A.
If your shop is running spray equipment requiring 10+ CFM continuously, the G3516VS75 at 11.5 CFM at 100 PSI is at its limit. Budget for the 5 HP Commercial Series for sustained spray work.
Factory-Mounted Options Available
- Air Operated Auto Drain: #ADVSM
- Auto Drain: #SDV03M
- Silencer 1": #SA100M
- Belt Guard Aftercooler: #BGAC1M
- Right From the Start Kit: #RFS001
- Vibration Pads 4x4x1" (set of 4): #VP1004
Why Buy From OEM Diagnostic Tools?
OEM Diagnostic Tools has supplied professional shop equipment and components since 2016. We carry Castair compressors because they are built the way shop compressors should be — cast iron, oil-lubricated, belt-driven, repairable. Free shipping on qualifying orders, free tech support at 866-217-0063, and full manufacturer warranty. Call us to compare this unit against the Commercial Series for your specific air demand.
Call 866-217-0063 for quick answers and help!
