1616580381: OFS K-21 SCREW ELEMENT

We supply the genuine and original Atlas Copco 1616580381 OFS K-21 oil-free screw element air end, as a brand-new original component sourced directly from Atlas Copco (Shanghai) Trading Co., Ltd. This screw element forms the compression core of Atlas Copco’s oil-free ZR and ZT series compressors, and plants that run oil-free air systems rely on it to keep compressed air free of oil carryover while holding rated flow and pressure.

ACD draws on more than ten years of focused experience in Atlas Copco compressor sales and maintenance to help engineering and procurement teams source, verify, and install this element with confidence.

Product Introduction

Inside an oil-free air compressor, a matched pair of precision-machined rotors intermeshes without contact. As the rotors turn, they trap incoming air at the inlet and carry it along the rotor length toward the discharge port, raising its pressure through mechanical compression alone. No lubricating oil enters this compression chamber. A dedicated shaft seal and a labyrinth or carbon-ring arrangement separate the oil-lubricated bearings from the air path, which is what allows the compressor to deliver Class 0 oil-free air to downstream processes.

The OFS K-21 designation identifies this element’s specific size and rotor profile within Atlas Copco’s oil-free screw range, and Atlas Copco engineers the rotor geometry, coating, and clearances of each size to match a defined flow and pressure rating.

Facilities that cannot tolerate any trace of oil in their compressed air — pharmaceutical production, semiconductor fabrication, food and beverage processing, and electronics manufacturing — depend on this level of engineering precision. Because output purity and energy efficiency both trace back to the rotor’s manufactured condition, plants replacing a worn or damaged element gain the most when they install a component built to the original factory tolerances rather than a component with an uncertain manufacturing history.

Product Parameters

Product Advantages

Genuine original manufacture: Atlas Copco produces the OFS K-21 element in Belgium under the company’s own quality system, and ACD purchases every unit brand-new, directly from Atlas Copco (Shanghai) Trading Co., Ltd., so the rotor geometry, coating, and internal clearances match the factory specification for the ZR/ZT series it serves.

Verified oil-free compression: the rotor profile and sealing arrangement keep lubricating oil fully isolated from the compression chamber, supporting the oil-free air quality that pharmaceutical, semiconductor, and food-grade processes require.

Restored rated performance: because the element is built to original tolerances, it restores the compressor’s designed flow and discharge pressure rather than requiring compensating adjustments elsewhere in the system.

Documented traceability: ACD provides the Atlas Copco part number, origin, and sourcing documentation with every shipment, giving procurement and quality teams a clear paper trail for audits and equipment records.

Direct engineering support: with over ten years of hands-on Atlas Copco compressor experience, the ACD technical team can confirm fitment against your compressor’s build list before you order, reducing the risk of installing the wrong element.

Efficient logistics: at 138 kg and a 62 × 46 × 38 cm footprint, the element ships and handles predictably, and ACD coordinates export documentation under HS Code 8414909090 for smooth customs clearance.

Installation Steps

1. Isolate and lock out the compressor, relieve system pressure, and allow the unit to cool before opening the air end housing.
2. Confirm the replacement element’s part number, rotor rotation, and stage position against the compressor’s build list, since oil-free elements are matched sets and each stage occupies a defined position.
3. Remove the coupling guard and disconnect the drive coupling from the existing element, then withdraw the worn element from the housing following the maintenance manual’s sequence.
4. Inspect the housing bore, shaft seals, and labyrinth or carbon-ring seal arrangement for wear, and replace any seal kit components recommended by the maintenance schedule.
5. Fit the new OFS K-21 element into the housing, aligning the rotor timing marks and torquing mounting fasteners to the values specified in the Atlas Copco service manual.
6. Reconnect the drive coupling, replace guards, and confirm correct rotor clearance before restoring lubrication to the bearing housing.
7. Restore power, bring the compressor up gradually, and monitor discharge pressure, flow, vibration, and air purity readings during the initial run-in period to confirm the element is performing to specification.

Why Choose Us？

We are an authorized Atlas Copco dealer with more than ten years of dedicated experience in Atlas Copco air compressor sales and maintenance. Every OFS K-21 element leaving our warehouse is a brand-new, genuine original unit purchased directly from Atlas Copco (Shanghai) Trading Co., Ltd., not a reworked or aftermarket substitute. Our technical team verifies fitment against your specific compressor model before shipment, prepares full export documentation for a smooth cross-border transaction, and remains available for installation guidance once the element arrives at your facility.

If your ZR or ZT oil-free compressor is due for an air-end replacement, contact ACD today for a formal quotation, current stock availability, and lead-time confirmation on part number 1616580381. Our engineers can review your compressor’s build list, confirm the correct element and stage position, and arrange fast, documented shipment so your oil-free air supply stays within specification with minimal downtime.

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