ABAC AS-20S503BMD 20 HP Rotary Screw Air Compressor - Base Mount with Dryer, 150 PSI, 78 CFM, 67 dBA

The ABAC AS-20S503BMD is a 20 HP rotary screw air compressor with an integrated refrigerated dryer, built for shops that need a lot of clean, dry air across a full shift. It delivers 78 CFM at 150 PSI and runs at 67 dBA. This is the base mount version, so it ships without a tank and plumbs into an air receiver you already own or one sized to your demand. Power is 208-230-460V three-phase.

Key specifications

• Model: AS-20S503BMD
• Motor: 20 HP
• Air delivery: 78 CFM
• Working pressure: 150 PSI
• Noise level: 67 dBA
• Mounting: base mount with integrated dryer, no tank
• Power supply: 208-230-460/3/60

Typical applications

Production and fabrication floors, automotive and fleet service bays, tire and truck shops, cabinet and woodworking shops, spray finishing, and any operation where moisture in the line is spoiling tools, air logic, or finish quality. A rotary screw is designed for continuous duty, so it holds a steady line pressure through a full shift instead of recovering between jobs, and the onboard dryer removes the water before it reaches your distribution piping.

Part of the ABAC AS-B screw range from the Atlas Copco group, which ABAC builds around a fully integrated aluminum block, vertical oil separation technology, and an energy-efficient motor. The S in AS-20S is the difference worth understanding: against the standard AS-20503BM at the same 20 HP and the same 150 PSI, this machine delivers 78 CFM instead of 54 CFM and runs at 67 dBA instead of 71 dBA. That is roughly 24 CFM more air from the same motor rating, which is what shops reach for when sandblasting, plasma cutting, or several bays running at once are pulling a standard 20 HP unit down. The 150 PSI rating suits plants with long distribution runs or tools that need pressure held higher at the point of use, while the companion 125 PSI build trades pressure for a little more flow. Choosing the BMD with the dryer already matched, mounted, and wired to the compressor means there is no separate dryer to size, find floor space for, or plumb in later.