Atlas Copco 1810015590=1810015580=1616884190 C200 OIS O-06 Air End

An air end is the core of a rotary screw compressor. Inside a precision housing run two intermeshing helical rotors, one male and one female, turning on heavy bearings. The drive motor spins the male rotor. It meshes with the female rotor through timing gears, so the two profiles keep a close, non-contact clearance. Air enters at the inlet port and gets trapped in the space between the rotors and the housing. That space grows then shrinks, and the air leaves compressed at the discharge port.

Oil is injected directly into the compression chamber. It seals the tiny gaps between the rotors and the housing. It also carries heat away from the compressed air and lubricates the bearings and rotor contact zones. That is why this element is called oil-injected rather than oil-free. A film of lubricant is part of the process. The oil is removed downstream by the separator before the air reaches the line.

The C200 OIS O-06 designation identifies the rotor size and profile family. When you hold the older number 1616884190 or the cross number 1810015580, the unit you need is the 1810015590 air end. The table below fixes the identity so there is no confusion at the counter.

The male rotor carries the drive. As it turns, its lobes push the female rotor, and the pair sweeps air from the suction side toward the discharge end. Because the rotors never touch, a thin oil film does the sealing. The oil also pulls heat out of the air, which is why discharge temperature stays controlled even under load.

Compression happens by volume reduction, not by heating the air with friction. The trapped pocket shrinks as the rotors advance, so pressure climbs steadily to the setpoint. A well-made rotor profile keeps this path smooth, which is where the original geometry matters most. Small deviations in the flank shape raise internal leakage and drop the delivered volume.

After compression the oil-laden air leaves the element and flows to the separator tank. There the bulk oil drops out and returns to the circuit, while the cleaned air continues to the aftercooler. The air end itself only builds pressure; the rest of the oil handling happens around it.

The nameplate on your machine confirms the exact fit. Give us the model and serial and we will match the right 1810015590 element before anything ships.