ABAC AS-20503TM 20 HP Rotary Screw Air Compressor - 131 Gallon Tank Mount, 150 PSI, 54 CFM, 71 dBA

The ABAC AS-20503TM is the 150 PSI, 131 gallon tank mount build of the 20 HP machine in the AS-B screw range. It delivers 54 CFM free air delivery at a 150 PSI maximum and runs at 71 dBA. The 150 PSI setting is the middle of the three builds on this frame, and it is the one to specify when a clamp circuit, a plant header or a long pipe run needs more than the usual 125 PSI but nothing on the floor genuinely calls for 175. Because the air end, the controls and the receiver ship as one assembly, installation comes down to setting it in place, landing power and tying into the air line. At 813 lbs on a 76 x 27 x 62 in footprint it takes roughly the floor space of a workbench. Power is 208-230-460V three-phase.

Key specifications

• Model: AS-20503TM (part number 4152043925)
• Motor: 20 HP, energy efficient
• Air delivery: 54 CFM free air delivery
• Maximum working pressure: 150 PSI
• Noise level: 71 dBA
• Mounting: tank mount on a 131 gallon air receiver
• Power supply: 208-230-460/3/60
• Weight: 813 lbs
• Dimensions (L x W x H): 76 x 27 x 62 in
• Eco-friendly vertical oil separation technology
• Digital controller with menu driven access for optimizing operating performance
• Brand: ABAC, part of the Atlas Copco group

Why a screw instead of another piston

A piston compressor builds air in bursts and needs time to cool between them. A rotary screw is rated for continuous duty, so it holds a flat line pressure through a full shift instead of sagging and recovering between jobs. That is the reason shops using air most of the day move off a reciprocating machine that is cycling hard, running hot and filling the room with noise. The AS-B air end is built around a fully integrated aluminum block and eco-friendly vertical oil separation, paired with an energy efficient motor and a digital controller, so the operating menus and the service intervals sit on the panel rather than on a clipboard. The trade is that a screw dislikes short cycling, which is exactly what the 131 gallon receiver underneath this one is there to prevent.

How it compares

Across the AS-B range pressure, airflow and mounting move independently on the same chassis. The AS-20253TM is this identical 813 lb package set for 125 PSI, trading pressure for airflow at 60.6 CFM, and the AS-20753TM goes to 175 PSI and 48.5 CFM. Buy pressure only to the level your highest tool actually needs, because every step up costs airflow. One size down, the AS-15503TM carries 46.4 CFM at the same 150 PSI on the same tank, which is the machine to compare against when the extra 7.6 CFM here is not yet needed. If you already own a receiver, the AS-20503BM is the bare 516 lb base mount at the same pressure on a 37 x 28 x 40 in footprint. If you want drying built in, the AS-20503TMD is this exact machine with the refrigerated dryer already mounted and piped. And if volume rather than pressure is the constraint, the quieter AS-20S503BM air end delivers 78 CFM at 67 dBA from the same 20 HP rating.

Typical applications

Production and fabrication floors, larger automotive and fleet service shops, tire and truck bays, cabinet and woodworking shops, plasma and laser tables, packaging lines, pneumatic controls and conveying, and multi bay operations adding a blast cabinet or a finishing booth. At 54 CFM it will keep several bays of air ratchets, sanders and continuous blow off fed through a shift without the line pressure sagging. The tank mount build is the one to buy for a new installation, or for a shop replacing a worn piston compressor outright, because it takes receiver sizing and tank piping out of the job.

What to pair it with

Give the cabinet clear air on the cooling side, keep it out of a hot corner, and run it on its own circuit sized to the motor nameplate. Oil, oil filter and separator element are the service items, and the digital controller tracks the intervals. Air leaving any screw carries moisture, so if it goes to paint, tires, pneumatic controls or anything that hates water, put a refrigerated dryer behind it. At 54 CFM the ABAC COOL 65 is the sensible match and the COOL 75 gives headroom for growth; both run on 115V, so they sit beside the compressor without new wiring. 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 connection sizes and installation clearances before you pipe it in.