Description
The 1616903490 is the Atlas Copco OIS D-20 service airend, the oil-injected screw compression element fitted to the compact G 2 to G 7 compressors and to the Quincy QGS 5, QGS 7.5 and QGS 10S. The stage is recorded in the item data under the designation SERVICE AIREND OIS D-20, and it travels with a second reference: the production number 1616903480, stamped on the element nameplate. The 1616903490 is the reference orders are written against.
This article sets out the identity of the 1616903490, the way its two references work, the machines the stage is confirmed for, and the figures a planner needs before ordering.
Identity of the 1616903490 Element
An element is the part that turns drive power into compressed air, and its identity rests on the designation in the item record together with the numbers that travel with it. For the 1616903490 the record carries one designation and one companion number, and reading them together is what keeps an order on track.
What the OIS D-20 Designation Covers
The item data lists the 1616903490 as SERVICE AIREND OIS D-20. The OIS marks the stage as oil-injected screw, the D-20 gives the version within the D element family, and the phrase service airend states the role directly: this is the ordering reference for the complete compression stage when it is bought as a replacement.
The same record places the 1616903490 in the rate group S3K Oil injected screw, Element. That group is where the item sits in the compressor parts classification, and it confirms the stage as a compression element rather than a filter, a valve or a control part.
As packed, the 1616903490 measures 22 × 17 × 15 cm and weighs 10.42 kg. That places it at the light end of the element range: a two-hand lift into and out of the machine, with no crane and no special floor route. The figures belong in the machine file beside the identification, because they keep the fitting day simple.
The Production Number 1616903480
The 1616903490 is also recorded under the production number 1616903480, and that number is stamped on the element nameplate beside the unit serial number. The production number is the reference used when the element is fitted to new machines, while the service number is the order code used when the stage is ordered as a spare.
Both numbers name the same OIS D-20 stage, and a machine file can carry either one. When a workshop reads 1616903480 off the nameplate of an outgoing element, the enquiry that follows still reaches the same part, and Seadweer reads the pair as one identification rather than as two parts. The 1616903490 is the reference this article uses throughout.
Keeping both references in the file matters at the point of ordering, because a fitter reading the nameplate and a planner reading a spares list can easily quote different numbers for the same position. The pair resolves that mismatch in one pass.
Confirmed Machine Applications
The 1616903490 is confirmed for two ranges of compact oil-injected screw compressors, one under the Atlas Copco name and one under Quincy, a brand of the same group. The sections below set out what each confirmation covers.
The Atlas Copco G 2 to G 7 Range
The G 2, G 3, G 4, G 5 and G 7 are the compact fixed compressors Atlas Copco builds for small workshops and light industrial duty, and the OIS D-20 is the compression element recorded for them. The 1616903490 therefore serves the whole range from the smallest to the largest model in the family.
For the workshops that run these machines, the practical meaning is direct: the element is the one major spare that restores full output, and a single reference covers every model from G 2 to G 7. A planned renewal with the 1616903490 turns an aging compressor back into a dependable unit at a fraction of the cost of a replacement machine.
Quincy QGS 5, QGS 7.5 and QGS 10S
The same stage is confirmed for the Quincy QGS 5, QGS 7.5 and QGS 10S. Quincy belongs to the same group as Atlas Copco, and the QGS range shares the compact oil-injected platform, which is why one element number appears in both product lines.
The cross-brand coverage matters for distributors and fleet operators who serve both nameplates. The 1616903490 is the stage recorded for the QGS models in their own parts documentation, so the confirmation stands on the same footing as the G-range entry rather than on a family resemblance.
The table below collects the confirmed applications in one place.
| Atlas Copco | G 2, G 3, G 4, G 5, G 7 |
| Quincy | QGS 5, QGS 7.5, QGS 10S |
For any machine not named here, the fitment is confirmed against the compressor record rather than from the family name, because the version and the build decide the exact stage.
What the Oil-Injected Screw Element Does
The 1616903490 is an oil-injected rotary screw element, the air end that turns drive power into compressed air. Its working principle explains both its efficiency and its service profile.
The Rotor Pair and the Oil Film
Two intermeshing helical rotors spin inside a precision-bored housing. Injected oil seals the running clearances between the rotors and the housing, carries the compression heat away and lubricates the bearings, so the rotors stay separated by an oil film rather than by metal-to-metal contact.
Air enters the stage after filtration, is compressed along the rotor path and leaves at working pressure, and the oil is removed downstream by the separator of the host machine. Because the oil does three jobs at once, the stage holds its efficiency over long runs, which is what a small workshop depends on from a compressor that runs all day.
Why Bearing Condition Drives Renewal
Wear in an injected screw stage concentrates in the bearings rather than in the rotors, because the oil film keeps the rotor surfaces apart. The bearing set carries the radial and thrust loads of the rotor pair, and its condition is the reading that drives renewal decisions on the 1616903490.
The oil circuit of the host machine is part of the working environment of the stage, so oil quality and separator condition belong to the service life of the 1616903490. A stage that runs on clean oil and a sound separator holds its clearances across the service window the machine defines.
Serialization and Traceability
The 1616903490 is a serialized item, and every unit carries a unique serial number on its nameplate. That record is what makes an individual stage traceable from the works to the machine it was fitted to.
The nameplate of the element carries two lines: the part number 1616903480 and the unit serial number. Those two together identify one specific stage, which is the level of detail a service file needs when a workshop runs several compact compressors of the same family over its life.
Reading the Nameplate Record
When a stage is renewed, the serial number on the outgoing element and the number on the incoming one are both worth recording. The pair links the machine history to the exact unit that ran in it, and it resolves any question about which element a past invoice referred to.
The same record is what the parts desk asks for at the point of ordering. Model, serial number and element number taken together from the compressor nameplate give the check everything it needs to confirm the 1616903490 against the machine build.
Planning with the Serial Number
A planned renewal reads the element reference off the machine and matches it to the spares list before the 1616903490 is ordered. Because the stage is serialized, the unit that arrives can be logged against the machine on the same line as the one it replaces.
Keeping the serial record current costs nothing at the time and saves a search later, when a workshop needs to know which element is in which machine.
Wear Signs and Renewal Timing
A stage of this class announces its aging through measured trends long before it fails outright, and the trends are readable with the instruments most workshops already have. On the 1616903490 the trends matter more than any single reading, because the stage works on every running hour.
Possible Warning Signs
Possible signs of element wear can include rising specific energy, drifting discharge pressure, unusual noise or vibration, higher oil temperature and metal traces in the oil sample. On a small compressor the first sign a workshop notices is often a longer recovery time between air demands, because widening internal clearances let compressed air slip back instead of leaving the stage.
Any of those trends is a reason to inspect the stage and plan the renewal. On a machine that stands between a workshop and its air supply, the inspection is worth doing before the next production run rather than during a breakdown.
Timing the Renewal
Oil-injected elements commonly reach their first major bearing service somewhere in the 20,000 to 40,000 running-hour range as a family-level reference, but the real timing follows the condition of the machine and the service documentation that applies to it rather than a fixed hour target.
Vibration checks, oil analysis and temperature trends predict bearing condition long before a fixed count is reached. A planned renewal with the 1616903490, ordered under the current number, beats an unplanned stop, because bearing fatigue left alone can let the rotors seize, which writes off the element rather than allowing a repair.
The routine services of the host machine cover the consumable parts such as filters and oil, and they are separate from the element renewal. The stage is a long-life component, and its renewal is planned on condition rather than on the service count.
Handling and Installation Notes
The 1616903490 is the easiest element class to handle, and the 10.42 kg weight and 22 × 17 × 15 cm box size belong on the plan for the fitting day.
Lifting and Preparation
At 10.42 kg the 1616903490 is a two-hand item that moves from store to machine without lifting gear, but the rotor bore and the shaft end still deserve the same care as on a large stage. The element is kept in its case until the mounting face of the host machine is cleaned, and the drive coupling is aligned to the element shaft before the fasteners go in.
Fitting and Run-In
Once the 1616903490 is in place, the oil circuit of the machine is refreshed and the separator is checked at the same visit. The machine is then run in under observation, so the pressure band and the oil temperature settle back to their normal readings before the compressor returns to full duty.
Because the renewal of the 1616903490 replaces the whole stage in one step, there is no rebuild kit to plan and no second visit to finish the job.
Ordering the 1616903490 Through Seadweer
Two references and one ordering direction are enough to make the order unambiguous, and the check that ties them together is worth one message.
Machine Record Check
Send Seadweer your compressor model and serial number, and the team checks the machine record against the 1616903490 before the quotation is issued. If your paperwork still shows the production number 1616903480, the check resolves it in the same pass, because both numbers name the same OIS D-20 stage.
The same check confirms the fitment for the G range and the Quincy QGS models alike, so the stage that arrives matches the position the machine needs.
What the Quotation Confirms
The quotation repeats the item data of the 1616903490: the designation, the box figures and the complete single-stage scope of the order. One confirmation covers the whole renewal, so the workshop can schedule the swap without waiting for a second item.
Send the model and serial number from your compressor nameplate to Seadweer, and the parts desk confirms the match and prepares your quotation.
Technical Specifications
The tables below collect the identification and physical data of the 1616903490 in one place, as the item data lists them.
Part Identification
| Item number | 1616903490 |
| Designation | SERVICE AIREND OIS D-20 |
| Production number | 1616903480 |
| Compression type | Oil-injected rotary screw |
| Rate group | S3K Oil injected screw, Element |
| Product group code | PCOM |
| Serialization | Serialized unit, unique serial number on the nameplate |
| Applications | Atlas Copco G 2 / G 3 / G 4 / G 5 / G 7, Quincy QGS 5 / QGS 7.5 / QGS 10S |
Dimensions and Weight
| Dimensions (L × W × H) | 22 × 17 × 15 cm |
| Weight | 10.42 kg |
| Country of origin | Belgium |
| Tariff code | 8414900090 |
The figures above are the item data of the 1616903490 for handling and logistics reference. The two tables together are the data sheet of the stage, and Seadweer repeats them with the quotation so the workshop knows what arrives before it arrives.
FAQ
What is the 1616903490?
The 1616903490 is the Atlas Copco OIS D-20 service airend, the oil-injected screw compression element of the compact G 2 to G 7 compressors and the Quincy QGS 5, QGS 7.5 and QGS 10S.
What is the difference between 1616903490 and 1616903480?
They are two references for the same OIS D-20 element. The 1616903480 is the production number stamped on the nameplate, and the 1616903490 is the service number that spare-parts orders are written against.
Which machines use the 1616903490?
The stage is confirmed for the Atlas Copco G 2, G 3, G 4, G 5 and G 7 and for the Quincy QGS 5, QGS 7.5 and QGS 10S. For any machine not listed, the fitment is confirmed from the compressor record rather than from the family name.
How heavy is the 1616903490?
The item data lists 10.42 kg and 22 × 17 × 15 cm as packed. It is a two-hand lift from store to machine, with no crane and no special floor route.
My records show 1616903480. Can I still order?
Yes. The 1616903480 is the production number of the same stage, and the order is simply written against the 1616903490. Send Seadweer the model and serial number, and the check confirms the match before the quotation is issued.
How do I order a renewal for my compressor?
Send Seadweer the compressor model and the serial number from the nameplate, and the parts desk checks the machine record against the 1616903490 before the quotation. The same check resolves the production number 1616903480 if your records show it.
More Parts List
For other Atlas Copco air compressor parts, please refer to the table below, where more models are listed. Feel free to contact us with your requirement.
| Part Number | Part Name | Part-Number |
|---|---|---|
| 1616896080 | ELEMENT COMPR. | 1616-8960-80 |
| 1616893081 | STAGES | 1616-8930-81 |
| 1616887990 | PMM M6-02 | 1616-8879-90 |
| 1616887890 | PMM M6-01 | 1616-8878-90 |
| 1616887790 | PMM M4-02 | 1616-8877-90 |
| 1635196000 | SUPPORT | 1635-1960-00 |
| 1420050338 | ORING | 1420-0503-38 |
| 6229022500 | CRANKCASE COVER B28/ | 6229-0225-00 |
| 2901163843 | GA18VSDIT 400-460V A | 2901-1638-43 |
| 2236102713 | KIT PRESS.CHN 100/300 HP2 RSA | 2236-1027-13 |
| 2235685380 | SET PIPES GM | 2235-6853-80 |
| 1320422628 | VOLUTE | 1320-4226-28 |
| 1901002588 | suction valve | 1901-0025-88 |
| 9828414223 | CUBICLE 5,5HP 230-50/60 | 9828-4142-23 |
| 1621505708 | GASKET | 1621-5057-08 |
| 1622221381 | DOOR ASSEMBLY | 1622-2213-81 |
| 1901617652 | AIR FILTER ELEMENT | 1901-6176-52 |
| 1630990233 | PUMP ADAPTER | 1630-9902-33 |
| 2205492111 | LU18-22 4k Kit | 2205-4921-11 |
| 1900535616 | DRIVE 98 KVA NEOS | 1900-5356-16 |
| 1628088000 | SAFETY VALVE | 1628-0880-00 |
| 1630800321 | AANZUIGFILTER 600 T.M 1250 | 1630-8003-21 |
| 1625161432 | SUPPORT | 1625-1614-32 |
| 1320407417 | ROTOR ASSY STG1+2 60 HZ | 1320-4074-17 |
| 1649910213 | PIPE | 1649-9102-13 |
| 1625174708 | COOLER | 1625-1747-08 |
| 1614289100 | FRAME | 1614-2891-00 |
| 1625978374 | BOWL | 1625-9783-74 |
| 2908008780 | METER | 2908-0087-80 |
| 1625215907 | POWER TRANSFORMER GA45-75 VSD+ | 1625-2159-07 |
| 1627746100 | WIRING FD610-1010 A | 1627-7461-00 |
| 1613807180 | VALVE ASSEMBLY | 1613-8071-80 |
| 1622077007 | PIGNON | 1622-0770-07 |
| 1625595132 | FAN RADIAL 3.5KW 575V 60HZ | 1625-5951-32 |
| 1901901648 | TIGHTNESS RING | 1901-9016-48 |
| 1627128282 | BRACKET VESSEL SUPPORT | 1627-1282-82 |
| 1621912908 | AFTERCOOLER | 1621-9129-08 |
| 1603724002 | CUBICLE 3PH CE / CSA/UL | 1603-7240-02 |
| 1127150117 | COVER | 1127-1501-17 |
| 1621014801 | NIPPLE NPTF 1/4+ – G1/4+ | 1621-0148-01 |
| 1092003320 | STIRRUP CLOSING LONG | 1092-0033-20 |
| 1310031125 | PANEL-ROOF | 1310-0311-25 |
| 1621944600 | BRACKET | 1621-9446-00 |
| 1624011500 | SHUTTLE VALVE / SEAT | 1624-0115-00 |
| 1089067912 | FAN | 1089-0679-12 |
| 1627151283 | LD200 ASSY 115V | 1627-1512-83 |
| 0574840246 | HOSE ASY | 0574-8402-46 |
| 2252425700 | ROOF | 2252-4257-00 |
| 2205615633 | OSE | 2205-6156-33 |
| 2914815200 | PANEL-CORNER | 2914-8152-00 |
Khalid Al-Mansouri –
Our G 5 had been losing output for months and the workshop was weighing a new machine against a repair. Seadweer matched the number on the old nameplate to the current ordering reference and quoted the complete stage. The element arrived a week later, and because it weighs so little our fitters swapped it on the bench without any lifting plan. The compressor has run inside its pressure band ever since.