ABAC AS-20503BM 20 HP Rotary Screw Air Compressor - Base Mount, 150 PSI, 54 CFM, 71 dBA

The ABAC AS-20503BM is a 20 HP fixed speed rotary screw air compressor for operations that have outgrown a 15 HP machine and need steady air across several bays at once. It delivers 54 CFM at 150 PSI and runs at 71 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-20503BM (part number 4152043916)
• Motor: 20 HP, energy efficient, oil lubricated screw element
• Air delivery: 54 CFM free air delivery, measured to ISO 1217 Annex C at 138 PSI
• Maximum working pressure: 150 PSI
• Noise level: 71 dBA, measured to ISO 2151:2004 by the ISO 9614/2 sound intensity method
• Mounting: base mount, no tank and no dryer
• Power supply: 208-230-460/3/60
• Weight: 516 lbs
• Dimensions: 37 x 28 x 40 in (L x W x H)
• Fully integrated aluminum block with vertical oil separation
• Digital controller for operating parameters and programmed maintenance
• Brand: ABAC, part of the Atlas Copco group

Why a screw instead of another piston

A rotary screw is rated for 100 percent duty, so it holds line pressure through a full shift instead of recovering between jobs. That is the reason to move off a piston machine that is cycling hard, running hot and filling the room with noise. ABAC builds the AS-B range around a new generation air end: a fully integrated aluminum block with eco-friendly vertical oil separation, paired with an energy efficient motor, which together hold down air loss, vibration and noise. Oil consumption stays low, and the digital controller keeps operating parameters and the programmed maintenance schedule on the panel rather than on a clipboard. At 37 x 28 x 40 in this is one of the smaller 20 HP footprints available, which is what lets it sit near the point of use instead of in a dedicated compressor room.

How it compares

Pressure and flow trade against each other across the AS-20 range on an identical 516 lb chassis. The AS-20253BM at 125 PSI carries 60.6 CFM, this 150 PSI build carries 54 CFM, and the AS-20753BM at 175 PSI carries 48.5 CFM. Specify the pressure your tools actually call for rather than the highest number on the list, because every step up costs flow. One size down, the 15 HP AS-15503BM delivers 46.4 CFM at the same 150 PSI, and one size up the 25 HP AS-25503BM delivers 92.2 CFM. If you would rather not source and plumb a receiver separately, the AS-20503TM arrives on a 131 gallon tank and the AS-20503TMD adds an integrated dryer on the same base.

Typical applications

Production and fabrication floors, machine shops running several cells at once, automotive and fleet service bays, tire and truck shops, cabinet and woodworking shops, pneumatic controls and conveying, and any operation where a reciprocating compressor is working too hard to hold line pressure. ABAC rates the AS-B range for automotive and industrial work. A rotary screw is built for continuous duty, so it holds steady line pressure through a full shift instead of recovering between jobs, and the compact footprint lets it sit close to the point of use.

What to pair it with

Base mount is the starting point for a modular compressed air system. Size a receiver to your demand and pipe it downstream of the compressor, then add moisture control if the air goes to paint, tires, controls or anything that hates water. Size the dryer above this machine's 54 CFM output, which makes the ABAC COOL 75 refrigerated air dryer the usual starting point, and it runs on 115V so it plugs in beside the compressor. Keep oil, the oil filter and a separator element on the shelf as the routine service items. See the rest of our rotary screw air compressors and the full refrigerated air dryer range. Call us with your tool list and duty cycle and we will confirm receiver sizing, connection sizes and installation clearances before you pipe it in.