ABAC AS-7.5501TM 7.5 HP Rotary Screw Air Compressor - 131 Gallon Tank Mount, 150 PSI, 27.1 CFM, 67 dBA

The ABAC AS-7.5501TM is the 150 PSI, 131 gallon tank mount build of the 7.5 HP machine in the AS-B screw range. It delivers 27.1 CFM at a 150 PSI maximum and runs at 67 dBA, quiet enough to sit in the work area instead of a separate compressor room. This is the higher pressure setting offered on the 7.5 HP air end, so it is the one to specify when a tool or a process needs more than the 125 PSI a standard shop supply gives. The air end and the receiver arrive as one assembled package on a 76 x 24 in footprint, so there is no separate tank to source, set and plumb. At 655 lbs it is the large receiver option in the 7.5 HP family, the one to buy when demand is intermittent and you want the compressor to run longer and rest longer rather than load and unload all day. Choose 230V single-phase (AS-7.5501TM) or 208-230-460V three-phase (AS-7.5503TM).

Key specifications

• Models: AS-7.5501TM (part number 4152044124) and AS-7.5503TM (part number 4152043894)
• Motor: 7.5 HP, energy efficient
• Air delivery: 27.1 CFM
• Maximum working pressure: 150 PSI
• Noise level: 67 dBA
• Mounting: tank mount on a 131 gallon air receiver
• Power supply: 230/1/60 or 208-230-460/3/60
• Weight: 655 lbs
• Dimensions (L x W x H): 76 x 24 x 63 in
• Fully integrated air end block of aluminum construction
• Eco-friendly vertical oil separation technology
• Digital controller with menu driven access for operation and programmed maintenance
• 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 designed to limit air loss, and ABAC pairs it 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 it is there to prevent.

How it compares

Across the AS-B range pressure, airflow, receiver size and mounting all move independently. The AS-7.5251TM is the identical 655 lb package set for 125 PSI, which buys back 3.4 CFM of airflow if your tools are happy at the lower pressure. If floor space is the constraint, the AS-7.5501TM7 carries the same 27.1 CFM at 150 PSI on a 71 gallon receiver at 507 lbs and a 63 x 23 in footprint. The AS-7.5501TMD is this same 131 gallon build with a refrigerated dryer already integrated at 741 lbs, which saves plumbing a separate dryer in. If you already own a receiver, the AS-7.5501BM is the bare 360 lb base mount at the same pressure and airflow on a 32 x 24 in footprint. Stepping down, the AS-5501TM gives 17.4 CFM at a quieter 63 dBA; stepping up, the AS-10503TM carries 34.1 CFM at 69 dBA on the same receiver. Buy pressure only to the level your highest tool actually needs, because every step up costs airflow.

Typical applications

Automotive and fleet service bays, tire and truck shops, small production and fabrication floors, cabinet and woodworking shops, plasma tables, packaging lines, and any operation where a piston compressor is cycling too hard to keep up. The 150 PSI rating suits shops running impact tools, pneumatic presses or clamping equipment that need pressure above the common 125 PSI setting, and it leaves room for the pressure drop a long header and a filter set will cost you before the air reaches the tool. At 27.1 CFM it will keep a pair of air ratchets, an orbital sander or a continuous blow off fed through a shift without the line pressure sagging. The 131 gallon receiver stores well over twice the air of the 71 gallon build, which matters when several bays hit the header at once or when a single large tool draws a short, heavy burst.

What to pair it with

Give the cabinet about 3 feet of 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, so keep a spare set on the shelf. Air leaving any screw is hot and saturated, so if it goes to paint, tires, pneumatic controls or anything that hates water, put a refrigerated dryer behind it. At 27.1 CFM the ABAC COOL 35 is the matching size and the COOL 50 leaves headroom for a later expansion, and 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 receiver sizing, connection sizes and installation clearances before you pipe it in.

CFM measured per ISO 1217 Annex C, quoted at 138 PSI for 150 PSI maximum units. Noise measured per ISO 2151:2004 using ISO 9614/2 (sound intensity method).