Screw Air Compressor Kit Air End Head fit S111 Atlas Copco

High-efficiency air end assembly designed for Atlas Copco S111 screw air compressors, compatible with part numbers 1303002080 and 1303002090. Manufactured by KINTON with advanced rotor geometry and premium bearing systems, it ensures outstanding energy efficiency, low noise, and stable operation under continuous heavy-duty use.

Application

Screw Air Compressor

Material

Stainless Steel

The S111 1303002080 / 1303002090 air end is not a universal replacement part, but a S111 series-exclusive core component customized for Atlas Copco’s S111 series screw compressors (including S111-75, S111-90 models). As the "power source" of the S111 series compressors, it directly determines the equipment’s high-pressure output stability, energy efficiency, and service life. Our S111 air end strictly follows Atlas Copco’s S111 series OEM technical standards, with 100% matching of structural dimensions, material specifications, and performance parameters to ensure "zero-adaptation" integration with your S111 compressor.

S111 Series Air End Model	Compatible Atlas Copco Compressor Model	Production Year	Core Matching Parameters
1303002080	S111-75 Screw Compressor	2020–2025	75kW motor, 16 bar rated pressure, horizontal mounting
1303002090	S111-90 Screw Compressor	2020–2025	90kW motor, 18 bar rated pressure, horizontal mounting

Special Quality Control

Every S111 1303002080 / 1303002090 air end undergoes a 4-step S111-series dedicated quality inspection before leaving the factory, far exceeding the standard of universal air ends:

Series-specific dimension verification: Using 3D coordinate measuring instruments to compare with Atlas Copco’s S111 series original air end 3D model, ensuring that the error of key dimensions (such as rotor clearance, shaft diameter, and mounting hole position) is less than ±0.002mm.
High-pressure performance test: Installed on the genuine S111-75 / S111-90 test bench, running continuously for 24 hours under rated pressure (16 bar / 18 bar) to verify that the pressure fluctuation is within ±0.2 bar.
Extreme environment simulation: Placed in a high-temperature and high-humidity test chamber for 100-hour operation to test the stability of the sealing system and material performance.
S111 series host matching test: Connected to the S111 series compressor control system to test the data interaction between the air end and the host (such as speed feedback, temperature monitoring), ensuring that it is fully compatible with the original control logic.

Exclusive High-Pressure Technology

High-Pressure Optimized Rotor Profile

Aiming at the high-pressure output demand of the S111 series (16–18 bar), the air end adopts S111-series dedicated high-pressure rotor profiles—a design that is not available in low-pressure air ends. The rotor uses a "5+6" lobe structure (male rotor 5 lobes, female rotor 6 lobes), and the helix angle is optimized to 32 degrees (the universal air end is usually 28 degrees). This design increases the compression ratio by 35% compared with ordinary rotors, ensures stable pressure output under high-load conditions, and reduces air leakage by 28% at the same time.

Double-Layer Metal Sealing System

In view of the high-pressure oil leakage problem that is easy to occur in the S111 series operation, the air end is equipped with a double-layer metal + polymer composite sealing system, which is very different from the traditional single-layer rubber seal:

Inner layer: Copper alloy metal seal ring, with high pressure resistance and wear resistance, avoiding seal deformation under high pressure.
Outer layer: Modified PTFE (polytetrafluoroethylene) seal ring, with excellent oil resistance and low friction coefficient, reducing the friction loss between the seal and the shaft while preventing oil leakage.
Sealing groove design: The special "U-shaped" sealing groove stores high-temperature resistant grease, forming a secondary oil seal barrier and further improving the sealing effect.

S111-Series Dedicated Oil Cooling Channel

Unlike the external oil cooling pipeline of ordinary air ends, the S111 1303002080 / 1303002090 air end is designed with integrated spiral oil cooling channels inside the housing—completely following the S111 series original design. The cooling channel is closely attached to the rotor chamber, and the cooling oil flows in a spiral direction, which increases the heat exchange area by 40% compared with the straight channel. Even under continuous high-pressure operation, the air end temperature can be controlled, avoiding performance degradation caused by overheating.

Technical Specifications

The following parameters are exclusively for the S111 1303002080 / 1303002090 air end, and each index is strictly matched with the S111-75 / S111-90 compressors:

Specification	1303002080 (For S111-75)	1303002090 (For S111-90)	S111 Series Matching Advantage
Compression Type	Twin-Screw (Oil-Injected)	Twin-Screw (Oil-Injected)	Matches S111 series high-pressure compression system
Rated Operating Pressure	16 bar (232 PSI)	18 bar (261 PSI)	Exact match with S111 series rated pressure
Maximum Operating Pressure	18 bar (261 PSI)	20 bar (290 PSI)	Meets S111 series pressure fluctuation requirements
Rated Airflow (at Rated Pressure)	12.5 m³/min (441 CFM)	15.2 m³/min (537 CFM)	Consistent with S111 series airflow output
Rotor Configuration	Male: 5 lobes / Female: 6 lobes	Male: 5 lobes / Female: 6 lobes	S111 series exclusive high-pressure rotor structure
Rotor Diameter x Length	105mm x 320mm	115mm x 350mm	Optimized for S111 series motor speed (3,200–3,500 RPM)
Shaft Material	TC4 Titanium Alloy	TC4 Titanium Alloy	Withstands S111 series high-torque operation
Housing Material	Ductile Iron (QT600-3)	Ductile Iron (QT600-3)	Resists high-pressure deformation, matching S111 series housing strength
Oil Cooling Channel Type	Integrated Spiral Channel	Integrated Spiral Channel	Reduces S111 series overall cooling system load
Operating Temperature Range	-25°C to 120°C (-13°F to 248°F)	-25°C to 120°C (-13°F to 248°F)	Adapts to S111 series high-temperature operating environment
Weight	85 kg (187 lbs)	98 kg (216 lbs)	Consistent with S111 series installation weight balance

Note: For S111 series compressors with special configurations (such as cold region versions, explosion-proof versions), please provide the compressor’s serial number (starting with "S111-") to our technical team. We will verify the compatibility with Atlas Copco’s S111 series special configuration database.

Advantages for Our S111 Series Operators

High-Pressure Output Stability

Generic high-pressure air ends often have pressure fluctuations of ±0.5 bar when outputting 16–18 bar pressure, which affects the stability of downstream equipment (such as high-pressure air guns, precision pneumatic valves). The S111 1303002080 / 1303002090 air end, relying on the S111 series exclusive rotor profile and sealing system, controls the pressure fluctuation within ±0.2 bar—fully meeting the high-precision pressure requirements of industries such as aerospace component processing and high-pressure testing. A Chinese aerospace parts manufacturer using this air end reported that the product qualification rate increased by 12% after replacing the air end.

Energy Saving in High-Pressure Scenarios

In high-pressure operation, the energy consumption of universal air ends increases significantly—usually 15–20% higher than the original S111 series air ends. The S111 1303002080 / 1303002090 air end optimizes the compression process through the S111 series dedicated design: the spiral oil cooling channel reduces the heat loss of the compression process, and the titanium alloy shaft reduces the mechanical energy consumption. The actual test shows that compared with universal high-pressure air ends, this air end can save more energy in 24-hour continuous high-pressure operation.

OEM Compatibility

Compatible Brand: Atlas Copco
Model: S111 series
OEM Part Numbers: 1303002080 / 1303002090
Type: Screw compressor air end replacement
Fitment: Direct replacement, no modification required

Airend/Rotor/Head PN
1616578982	1616578992	1616671280	1616671290	1616740881	1616740891	1616740980	1616740990
1616714692	1616714682	1616714683	1616714693	1616714680	1616714690	1616725781	1616725791
1616651280	1616651283	1616725681	1616725691	1616528850 1616528880	1616635681	1616635682	1616590481
1616590482	1616590483	1616734580	1616734581	1616734591	1616734582	1616734592	1616740881
1616626081	1616738280	1616630581	1616630582	1616692580	2236050200	2236050100	1616710380 1616710390
1616657583	1616657580	1616580381	1616580382	1616646680	2989015800	1616761280	1616761290
1616646680	2989015800	1616757580	1616757590	1616754080	1616754090	1616585181	1616747281

If you are unsure of compatibility, please contact us with your compressor’s nameplate data for confirmation.

Maintenance Tips

To keep the air end performing at its best:

Replace compressor oil and filters as scheduled.
Check bearing temperature and listen for abnormal sounds.
Keep air intake filters clean to prevent dust ingress.
Ensure cooling systems are unobstructed for efficient heat dissipation.

Proper preventive maintenance will ensure years of reliable service and stable output.

MAECENAS IACULIS

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ADIPISCING CONVALLIS BULUM

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