1303002090=1303002080 | ATLAS COPCO S111 OIS K-70 AIR END

The Atlas Copco 1303002090=1303002080 S111 OIS K-70 air end, is the core air compressor head built for Atlas Copco oil-injected rotary screw air compressors.

Product Introduction

The Atlas Copco S111 OIS K-70 air end, part number 1303002080, is the core compression assembly built for Atlas Copco oil-injected rotary screw air compressors. The matching order reference number is 1303002090, which customers use to confirm procurement and logistics arrangements for this genuine spare unit. We source this air end directly from Atlas Copco (Shanghai) Trading Co., Ltd., and every unit we supply is brand new, authentic, and fully inspected before shipment.

As Atlas Copco air compressor air end, this part performs the critical air compression process. It replaces worn or failed original air ends on compatible Atlas Copco oil-injected compressors and restores the machine’s rated airflow, working pressure, and operational efficiency. Many industrial facilities rely on stable compressed air for production lines, pneumatic tools, packaging stations, and automated equipment. A damaged air end will cut production output, raise power consumption, and trigger unplanned downtime. This genuine S111 OIS K-70 air end eliminates those risks and extends the usable service life of your existing compressor host.

We supply this spare part globally for workshops, manufacturing plants, mining sites, construction teams, and general industrial operators. Our team handles proper packaging and documentation to support international shipping, customs clearance, and tariff declaration. The declared tariff code for this Atlas Copco air end is 8414909090, and the product originates in China under Atlas Copco’s strict production specifications. You receive complete factory test records and identification marks to verify its genuine status.

Working Principle

This S111 OIS K-70 air end uses oil-injected screw compression technology. Two precision-machined male and female rotors rotate inside the air end housing in synchronized motion. As the rotors turn, they create sealed cavities that continuously draw in ambient air through the inlet port.

Injected compressor oil flows into these cavities at the same time. The oil serves three core functions: it cools the compressed air during compression, seals the tiny gaps between rotor profiles and the housing, and lubricates the rotor bearings to reduce friction and wear. The rotor rotation reduces the internal cavity volume step by step, which raises air pressure gradually. When the compressed air reaches the designed pressure level, the mixture of compressed air and lubricating oil exits through the discharge port. The oil-air mixture then moves to the oil separator tank outside the air end for separation. Clean compressed air goes onward to your air system, while the oil circulates back to the air end for repeated use.

The tight rotor clearances and precision manufacturing of this genuine Atlas Copco unit guarantee stable volumetric efficiency. Non-genuine alternatives often have inconsistent rotor tolerances that leak compressed air and waste electricity. This genuine S111 OIS K-70 air end maintains consistent compression performance across thousands of operating hours.

Product Specifications

Item	Details
Part Name	S111 OIS K-70 Spare
Part Number	1303002080
Order Reference Number	1303002090
Brand	Atlas Copco
Supplier	Sichuan Sekes Mechanical And Electrical Technology Co., Ltd.
Source	Brand new genuine unit purchased from Atlas Copco (Shanghai) Trading Co., Ltd.
Application	Atlas Copco oil-injected rotary screw air compressors
Tariff Code	8414909090
Outer Package Dimensions	53 cm (L) × 33 cm (W) × 24 cm (H)
Gross Weight	96 kg
Unit Price	$2,500.00, excluding VAT

Every unit leaves the factory after performance testing. The dimensional and weight data support accurate freight quotation, container planning, and customs filing for cross-border orders. We mark both the part number and order number clearly on the outer carton to avoid picking and receiving mistakes in your warehouse.

Key Product Advantages

First, you get 100% genuine Atlas Copco quality. We purchase this S111 OIS K-70 air end directly from Atlas Copco (Shanghai) Trading Co., Ltd. You avoid the hidden risks of low-quality substitutes that fail early and damage your compressor system. Genuine components match the original design perfectly and protect your compressor warranty terms where applicable.

Second, this air end delivers stable energy efficiency. The precision rotor profile keeps internal air leakage low. It maintains the rated free air delivery without extra power draw. Over long-term operation, the lower energy loss creates obvious savings on your electricity bills. Many customers report that replacing a worn air end with this genuine unit reduces monthly power costs significantly.

Third, it supports easy alignment and installation. Atlas Copco designs the mounting points, inlet and outlet ports, drive connection, and oil passages to match your original assembly. You do not need to modify the compressor frame or piping during replacement. Proper fit reduces assembly time and avoids secondary leaks caused by mismatched spare parts.

Fourth, the unit offers reliable wear resistance. The bearings, rotor coating, and sealing components follow Atlas Copco’s global material standards. The air end resists thermal fatigue under continuous heavy-duty cycles. It works reliably in dusty workshops, high-temperature plant environments, and non-stop production schedules.

Fifth, our documentation package simplifies international trade. We provide commercial invoices, packing lists, and product information matching the tariff code 8414909090. Our team coordinates shipping information to help you complete import declaration smoothly.

When Should You Replace the S111 OIS K-70 Air End (1303002080)

You plan a replacement when your existing air end shows clear failure signs. Replace it immediately if your compressor delivers far less airflow than its rated value, even after you service filters, separators and oil circuits.

Watch for abnormal noise from the compressor host. Knocking, grinding or high-pitched metallic sounds inside the air end usually signal bearing damage or rotor contact. Continuous high vibration on the compressor body is another warning sign. You also need to arrange replacement if you detect persistent internal oil leakage inside the air end housing, or if the compressor trips frequently on high discharge temperature.

Follow the Atlas Copco service schedule for your compressor model. Even without obvious faults, you should inspect the air end closely once it reaches the recommended service hour threshold. Delayed replacement of a degraded air end can cause rotor seizure. A seized rotor will lock the compressor drive and destroy motor couplings or the main motor, which creates far higher repair costs and longer production shutdowns.

Do not run a faulty air end continuously. Schedule the replacement during your planned maintenance window to minimize disruption to your production. Keep this genuine S111 OIS K-70 air end in your critical spare inventory if your compressor runs 24/7.

Step-by-Step Installation Procedure

Always lock out and tag out the compressor power supply before you start any work. Fully depressurize the compressor system and drain all residual compressor oil from the host. Confirm zero pressure on all pressure gauges before you disconnect any piping.

Step 1: Remove connecting components. Take off the drive coupling, safety guards, inlet pipe, discharge pipe, oil supply line and oil return line connected to the old air end. Label every pipe and connector to simplify reconnection.

Step 2: Unbolt the mounting fasteners and lift the old air end carefully out of the compressor frame. Use proper lifting tools to avoid impact damage to the compressor base. Clean the mounting surface thoroughly and remove old gasket residue, dirt and metal debris.

Step 3: Unpack the new Atlas Copco S111 OIS K-70 air end (part 1303002080). Inspect the unit for transit damage, and verify the part marking against your order number 1303002090. Confirm you have all matching gaskets and sealing parts included for assembly.

Step 4: Position the new air end onto the mounting base. Align the coupling hub accurately. Adjust the alignment to meet Atlas Copco’s tolerance requirements. Poor coupling alignment creates rapid bearing wear and early air end failure. Tighten mounting bolts in the correct torque sequence.

Step 5: Reconnect all inlet, discharge and oil lines. Fit new gaskets at every flange joint. Do not reuse old gaskets. Double-check all threaded connections to prevent air or oil leaks.

Step 6: Refill the system with the correct Atlas Copco recommended compressor oil. Complete the pre-start inspection checklist. Check all safety sensors, temperature probes and pressure transducers.

Step 7: Perform a no-load test run first. Start the compressor and monitor vibration, discharge temperature and oil pressure for 30 minutes. Shut down the machine immediately if you spot abnormal noise, vibration or leakage. Once the test passes, restore the compressor to normal loaded operation.

Purchase Call to Action

If your Atlas Copco oil-injected screw compressor needs a replacement air end, this genuine S111 OIS K-70 unit (1303002080, order reference 1303002090) is your safest choice. We stock this authentic spare sourced from Atlas Copco (Shanghai) Trading Co., Ltd. and prepare fast shipment for urgent breakdowns. Our team supplies accurate commercial documents to support your import clearance.

Send us your inquiry today, share your compressor model and running hours, and we will confirm compatibility for you. We arrange secure packaging to protect the 96 kg air end during transit. Invest in genuine Atlas Copco parts now, cut unplanned downtime, protect your compressor asset, and keep your compressed air supply stable for your production line. Every genuine air end you buy from us delivers the performance and service life that Atlas Copco designs into this core component.

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