{"id":8017,"date":"2026-09-21T02:39:54","date_gmt":"2026-09-21T02:39:54","guid":{"rendered":"https:\/\/www.compressorpartsmall.com\/?post_type=product&p=8017"},"modified":"2026-09-28T03:55:08","modified_gmt":"2026-09-28T03:55:08","slug":"atlas-copco-1616635681-ofs-q-21-oil-free-screw-element","status":"publish","type":"product","link":"https:\/\/www.compressorpartsmall.com\/es\/product\/atlas-copco-1616635681-ofs-q-21-oil-free-screw-element\/","title":{"rendered":"Elemento de tornillo sin aceite Atlas Copco 1616635681 OFS Q-21"},"content":{"rendered":"

El 1616635681<\/strong> is the OFS Q-21 oil-free screw element, the compression stage Atlas Copco builds for oil-free rotary screw compressors<\/a>. It turns shaft power into compressed air with nothing added to the compression chamber, so the air leaving its discharge port carries no lubricant from the stage itself.<\/p>\n

This is one of the larger stages in the oil-free screw range. Packed, the 1616635681<\/strong> measures 126 \u00d7 86 \u00d7 85 cm and weighs 904.00 kg, and Belgium is recorded as the country of origin. The item record lists the unit as serialized, which means a plate on each element identifies it on its own rather than by family alone.<\/p>\n

En este art\u00edculo se explica qu\u00e9 es el 1616635681<\/strong> is, how an oil-free element produces air with no lubricant in the chamber, what its physical scale means for handling, how fitment is confirmed and how the order is placed.<\/p>\n

What the 1616635681 OFS Q-21 Element Is<\/h2>\n

Un elemento es la etapa de compresi\u00f3n principal de un compresor de tornillo, y el 1616635681<\/strong> fills that role as the OFS Q-21 stage. It converts shaft power into air flow at pressure, and it is a long-life factory assembly rather than a consumable. When a stage reaches the end of its working life it is renewed as a complete unit, with the rotor pair, the housing and the bearings built as one.<\/p>\n

The interfaces on that assembly are set by the machine it was built for. Two stages can share a designation and still fill different positions on different builds, so the match is confirmed from the compressor record rather than from the code on the casting. That is why the 1616635681<\/strong> is ordered against a machine rather than against a description.<\/p>\n

The OFS Q-21 Designation<\/h3>\n

OFS is the oil-free screw designation, and Q-21 is the stage code Atlas Copco records for this element. The code is quoted in the parts records exactly as it stands, and it separates the Q-21 stage from the other stages of the same family. It is the first reference to check when a renewal of the 1616635681<\/strong> is being confirmed.<\/p>\n

The Plate on the Housing<\/h3>\n

El registro del art\u00edculo recoge los siguientes datos: 1616635681<\/strong> as serialized, and the plate on the housing is where that is read. It carries the part number and a unit number, and the same number appears in the printed form 1616 6356 81 across the shipping and build documents. Both forms name the same stage.<\/p>\n

Between the two, the unit number is the more specific. It links the stage to the record it was built under and to the compressor it was fitted to, which is the detail a machine file needs. Where several machines of one model stand side by side, the unit number is what keeps their histories apart.<\/p>\n

\"Atlas
Atlas Copco OFS Q-21 1616635681 (1)<\/figcaption><\/figure>\n

How an Oil-Free Screw Element Compresses Air<\/h2>\n

Oil-free compression starts from a simple condition: nothing inside the compression chamber of the 1616635681<\/strong> lubricates the rotors. The rotor pair turns in a precision-bored housing with the running gap held small enough to seal the pocket, and the two rotors stay apart instead of riding on each other.<\/p>\n

With no oil film carrying the load, timing gears at the drive end hold the rotor pair in phase. An anti-friction coating on the rotor surfaces protects them inside that non-contact gap, precision rolling bearings take the radial and thrust loads of the shafts, and a shaft seal keeps gear-end lubrication on the gear side of the 1616635681<\/strong>.<\/p>\n

The result is an air path with no lubricant to remove. Plants that run oil-free screw units work to air quality classes where oil must not enter the air at all, and the compression stage is the point where that condition is set. Everything downstream of the discharge port inherits the quality the stage of the 1616635681<\/strong> delivers.<\/p>\n

\"Atlas
Atlas Copco OFS Q-21 1616635681 (2)<\/figcaption><\/figure>\n

The Scale of the Q-21 in the Package<\/h2>\n

At 904.00 kg and 126 \u00d7 86 \u00d7 85 cm, the 1616635681<\/strong> is a stage that is planned for rather than lifted by hand. The figures describe the unit as it is supplied, and they shape the route from the unloading point to the machine before the fitting day arrives.<\/p>\n

Dimensions and Packing<\/h3>\n

The envelope decides the access path. A stage of this size reaches the machine on a pallet or in a case, and the openings it has to pass are measured in advance: doorway widths, lift capacity and the turning space in front of the machine. The lifting gear is matched to the 904.00 kg of the 1616635681<\/strong>, and the slinging is arranged so the load stays level through the move.<\/p>\n

Rigging and Setting Down<\/h3>\n

The stage is carried on its mounting faces and never on its shaft. Lifting points stay on the housing, and the unit is set down on a surface that will take its weight. The port caps stay in place until the moment of fitment, so nothing reaches the bore of the 1616635681<\/strong> while it is exposed.<\/p>\n

A second pair of hands at the machine is worth planning for. Setting a stage of this mass onto its faces is a controlled two-point operation, and the same care covers the removal of the unit being replaced. The 1616635681<\/strong> is handled the same way on the way out as on the way in.<\/p>\n

Fitment and the Machine Record<\/h2>\n

An oil-free package compresses in one stage or in two, with intercooling between them, and the position the 1616635681<\/strong> El n\u00famero de llenados viene determinado por el dise\u00f1o de la m\u00e1quina. En una unidad de dos etapas, las posiciones de baja presi\u00f3n y alta presi\u00f3n corresponden a etapas diferentes, y cada una de ellas se identifica con su propio n\u00famero.<\/p>\n

Interfaces the Renewal Must Match<\/h3>\n

The shaft end that takes the drive, the faces of the inlet and discharge ports and the mounting faces that set its position in the frame are all part of that build. A stage made for one position carries the port arrangement and the drive interface of that position, so the 1616635681<\/strong> does not move to another position unless the parts list for the serial number says it does.<\/p>\n

Air reaches the inlet after the filter and leaves the discharge towards the aftercooler and the treatment line, which puts the stage at the centre of the air path through the package. Seals and gaskets are renewed with the 1616635681<\/strong> rather than carried over from the unit coming out.<\/p>\n

Alignment and the First Run<\/h3>\n

Before the machine is closed up, the mounting faces are cleaned and checked for burrs, the coupling or the belt layout is inspected for wear, and alignment and direction of rotation are confirmed. Once running, the machine is brought up unloaded and watched while the readings settle.<\/p>\n

Discharge temperature, pressure and vibration at the bearing housings are logged through the first running period, and the coupling and mounting fasteners are re-torqued after the first hours. That short log becomes the baseline for every later check on the 1616635681<\/strong>.<\/p>\n

\"Atlas
Atlas Copco OFS Q-21 1616635681 (3)<\/figcaption><\/figure>\n

Condition Signals Before a Renewal<\/h2>\n

Renovaci\u00f3n de la 1616635681<\/strong> is decided on condition rather than on a fixed hour count. Two lines of evidence carry most of that decision, and both of them read best as trends taken at a fixed interval rather than as single figures.<\/p>\n

Air-Side Readings<\/h3>\n

The rotor coating is what changes first. As it wears, the running gap opens and the stage delivers less air at the same shaft power, so free air delivery measured at the rated pressure is the reading that follows that change. Discharge temperature at a steady load moves with it.<\/p>\n

A stage that has to work harder for the same output draws more power for each unit of air. Recorded beside the delivery figure, that reading separates a worn 1616635681<\/strong> from a machine whose demand has simply changed.<\/p>\n

Mechanical Readings<\/h3>\n

Las vibraciones en los alojamientos de los cojinetes y el nivel de ruido en torno a los 1616635681<\/strong> form the second line of evidence. Bearing fatigue develops slowly, and a single measurement says little on its own; taken at a fixed interval, the same reading becomes a trend.<\/p>\n

Left unchecked, bearing fatigue can end with the rotors touching, and at that point the stage is written off rather than renewed. A planned renewal avoids that outcome, because the unit is changed while the frame, the drive and the pipework are still in good order. The unit number recorded in the machine file is what makes the timing judgement on the 1616635681<\/strong> easier.<\/p>\n

\"Atlas
Atlas Copco OFS Q-21 1616635681 (4)<\/figcaption><\/figure>\n

Especificaciones t\u00e9cnicas<\/h2>\n

En las tablas siguientes se recogen los datos de identificaci\u00f3n y las caracter\u00edsticas f\u00edsicas registradas para el 1616635681<\/strong>.<\/p>\n

Identificaci\u00f3n de piezas<\/h3>\n\n\n\n\n\n\n\n
N\u00famero de art\u00edculo<\/td>\n1616635681<\/td>\n<\/tr>\n
Denominaci\u00f3n<\/td>\nOFS Q-21<\/td>\n<\/tr>\n
Tipo de compresi\u00f3n<\/td>\nCompresor de tornillo sin aceite<\/td>\n<\/tr>\n
Grupo de productos<\/td>\nPCZA<\/td>\n<\/tr>\n
Publicado por entregas<\/td>\nS\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Dimensiones y peso<\/h3>\n\n\n\n\n\n\n\n
Dimensiones (largo \u00d7 ancho \u00d7 alto)<\/td>\n126 \u00d7 86 \u00d7 85 cm<\/td>\n<\/tr>\n
Peso<\/td>\n904.00 kg<\/td>\n<\/tr>\n
Cantidad por pal\u00e9<\/td>\n1<\/td>\n<\/tr>\n
Pa\u00eds de origen<\/td>\nB\u00e9lgica<\/td>\n<\/tr>\n
C\u00f3digo arancelario<\/td>\n8414900090<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The 904.00 kg weight and the 126 \u00d7 86 \u00d7 85 cm envelope describe the 1616635681<\/strong> tal y como se suministra, y establecen el plan de gesti\u00f3n para el d\u00eda de la instalaci\u00f3n. Seadweer confirma los detalles actuales del paquete junto con el presupuesto.<\/p>\n

Ordering the 1616635681 Through Seadweer<\/h2>\n

Hay dos datos que determinan el orden: el n\u00famero del escenario que se va a sustituir, que reza: 1616635681<\/strong> or 1616 6356 81 in the printed form, and the model and serial number from the compressor nameplate. The nameplate matters because stage position and port arrangement differ across the builds that use this element family.<\/p>\n

Qu\u00e9 hay que enviar junto con la solicitud de informaci\u00f3n<\/h3>\n

Env\u00eda ambos a Seadweer y el departamento de repuestos comprobar\u00e1 el n\u00famero con el registro de la m\u00e1quina y confirmar\u00e1 el 1616635681<\/strong> de una sola vez. Cuando el n\u00famero de la plataforma antigua se ha borrado, basta con la placa identificativa, ya que la lista de piezas de la m\u00e1quina indica la plataforma con la que se fabric\u00f3.<\/p>\n

Las plantas que cuentan con varios compresores mantienen un breve registro de cada m\u00e1quina: modelo, n\u00famero de serie y n\u00famero de etapa. Ese registro permite que la siguiente consulta se resuelva con un \u00fanico mensaje y una respuesta confirmada, y es el mismo registro que utiliza el departamento de repuestos cuando el 1616635681<\/strong> se cita.<\/p>\n

Lo que repite la cita<\/h3>\n

La cotizaci\u00f3n repite los datos del art\u00edculo del 1616635681<\/strong>: the stage designation, the packed size, the weight, the country of origin and the tariff code. One confirmation covers the whole renewal, so the workshop plans the lift and the stop without a second enquiry for the same stage.<\/p>\n

\"Atlas
Atlas Copco OFS Q-21 1616635681 (5)<\/figcaption><\/figure>\n

Preguntas frecuentes<\/h2>\n

What does the unit number on the 1616635681 record?<\/h3>\n

El registro del art\u00edculo indica que la fase es \u00abserializada\u00bb, por lo que cada 1616635681<\/strong> carries a part number and a unit number on its housing plate. The unit number links the stage to its build record and to the machine it was fitted to, and it is the reference to log in the machine file after a renewal.<\/p>\n

Which compressors take the OFS Q-21 stage?<\/h3>\n

The OFS Q-21 belongs to the oil-free rotary screw family, which covers stationary oil-free compressors. Stage position and port arrangement differ across those builds, so the parts list for your machine serial number is the record that confirms the 1616635681<\/strong> para tu puesto.<\/p>\n

How is a 904.00 kg element handled on site?<\/h3>\n

The item data lists 904.00 kg in a 126 \u00d7 86 \u00d7 85 cm package, so the move is planned with lifting gear rated for that mass and an access route measured in advance. The 1616635681<\/strong> se apoya en sus caras de montaje y nunca en su eje.<\/p>\n

\u00bfEs necesario lubricar alguna vez un elemento sin aceite?<\/h3>\n

No entra aceite en la c\u00e1mara de compresi\u00f3n del 1616635681<\/strong>. The rotor pair runs in a non-contact gap held by timing gears, and gear-end lubrication stays behind the shaft seal, away from the air path.<\/p>\n

\u00bfQu\u00e9 datos indican que es el momento de renovar la etapa?<\/h3>\n

Entre los posibles indicios se pueden incluir una disminuci\u00f3n del caudal de aire libre a la presi\u00f3n nominal, un aumento de la temperatura de descarga con una carga constante, un mayor consumo de potencia por unidad de aire y un aumento de las vibraciones en las cajas de cojinetes. Estas lecturas, registradas a intervalos fijos, conforman la tendencia en la que se basa la decisi\u00f3n.<\/p>\n

\u00bfC\u00f3mo puedo comprobar cu\u00e1l es la etapa adecuada para mi m\u00e1quina?<\/h3>\n

Lee el n\u00famero que figura en la plataforma que se va a sustituir y anota el modelo y el n\u00famero de serie que aparecen en la placa de caracter\u00edsticas del compresor. Env\u00eda ambos datos a Seadweer y se comprobar\u00e1 la compatibilidad con el registro de la m\u00e1quina antes de realizar el pedido.<\/p>\n

More Air Compressor Parts List<\/h2>\n

If you require other Atlas Copco air compressor parts, additional models can be found in the table below. Please review it or contact us for details.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
N\u00famero de referencia<\/th>\nNombre de la pieza<\/th>\nN\u00famero de referencia<\/th>\n<\/tr>\n
1616635683<\/td>\nSTAGE 6 GAS<\/td>\n1616-6356-83<\/td>\n<\/tr>\n
1616635689<\/td>\nOFS Q-29<\/td>\n1616-6356-89<\/td>\n<\/tr>\n
1616630589<\/td>\nOFS O-29<\/td>\n1616-6305-89<\/td>\n<\/tr>\n
1616630583<\/td>\nCOMPR.ELEMENT<\/td>\n1616-6305-83<\/td>\n<\/tr>\n
1616630582<\/td>\nO.F.S. O-22<\/td>\n1616-6305-82<\/td>\n<\/tr>\n
1619685800<\/td>\nSEAL<\/td>\n1619-6858-00<\/td>\n<\/tr>\n
2250567700<\/td>\nGEAR<\/td>\n2250-5677-00<\/td>\n<\/tr>\n
2235780780<\/td>\nBACK PANEL ASS\u2019Y SDR<\/td>\n2235-7807-80<\/td>\n<\/tr>\n
1635453700<\/td>\nTUBO<\/td>\n1635-4537-00<\/td>\n<\/tr>\n
1622344400<\/td>\nPERMANECER<\/td>\n1622-3444-00<\/td>\n<\/tr>\n
1901015129<\/td>\ncylinder<\/td>\n1901-0151-29<\/td>\n<\/tr>\n
1625157683<\/td>\nSERVICE DOOR ASSEMBLY<\/td>\n1625-1576-83<\/td>\n<\/tr>\n
1310035309<\/td>\nWINDOW<\/td>\n1310-0353-09<\/td>\n<\/tr>\n
1310034696<\/td>\nHANGER<\/td>\n1310-0346-96<\/td>\n<\/tr>\n
1089939845<\/td>\nTERMINAL<\/td>\n1089-9398-45<\/td>\n<\/tr>\n
1900250717<\/td>\nELECTRICAL CUBICLE GA37-55 VSD<\/td>\n1900-2507-17<\/td>\n<\/tr>\n
1630800607<\/td>\nAIRSAVER 16B \u2013 BALLVALVES G1<\/td>\n1630-8006-07<\/td>\n<\/tr>\n
1310252950<\/td>\nCONTACTOR<\/td>\n1310-2529-50<\/td>\n<\/tr>\n
1635382617<\/td>\nDECAL UNIT<\/td>\n1635-3826-17<\/td>\n<\/tr>\n
1320404616<\/td>\nIMP FIN AV6 3RD FC-4 8 BAR-E<\/td>\n1320-4046-16<\/td>\n<\/tr>\n
1624063628<\/td>\nNOZZLE 4,1<\/td>\n1624-0636-28<\/td>\n<\/tr>\n
1625180618<\/td>\nKIT DE V\u00c1LVULAS T\u00c9RMICAS<\/td>\n1625-1806-18<\/td>\n<\/tr>\n
1310030198<\/td>\nINSULATION<\/td>\n1310-0301-98<\/td>\n<\/tr>\n
2205615213<\/td>\nBELT-XPA1232<\/td>\n2205-6152-13<\/td>\n<\/tr>\n
2904006900<\/td>\nSEAL<\/td>\n2904-0069-00<\/td>\n<\/tr>\n
3121007200<\/td>\nJUNTA T\u00d3RICA<\/td>\n3121-0072-00<\/td>\n<\/tr>\n
1901008756<\/td>\nFilter<\/td>\n1901-0087-56<\/td>\n<\/tr>\n
2200902767<\/td>\nKIT REPL. FOR AEZ4425 Y-H<\/td>\n2200-9027-67<\/td>\n<\/tr>\n
1092075835<\/td>\nELECTRIC PANEL<\/td>\n1092-0758-35<\/td>\n<\/tr>\n
1617370000<\/td>\nCOMPRESSOR<\/td>\n1617-3700-00<\/td>\n<\/tr>\n
1092026300<\/td>\nCONJUNTO DE DEFLEXORES<\/td>\n1092-0263-00<\/td>\n<\/tr>\n
1089961141<\/td>\nMODULE<\/td>\n1089-9611-41<\/td>\n<\/tr>\n
1628280300<\/td>\nLOUVER WITH ATEX MOTOR<\/td>\n1628-2803-00<\/td>\n<\/tr>\n
1202680205<\/td>\nCABLE<\/td>\n1202-6802-05<\/td>\n<\/tr>\n
1614959000<\/td>\nREFRIGERADOR SECUNDARIO<\/td>\n1614-9590-00<\/td>\n<\/tr>\n
1901068188<\/td>\nSafety Valve-FILME COMPRESSOR<\/td>\n1901-0681-88<\/td>\n<\/tr>\n
1624623897<\/td>\nHOSE DN20 PN16 L=390<\/td>\n1624-6238-97<\/td>\n<\/tr>\n
1124080146<\/td>\nKIT DE CARCASA + VENTILADOR L30P<\/td>\n1124-0801-46<\/td>\n<\/tr>\n
1900223914<\/td>\nCUBICLE GA15-30VSD<\/td>\n1900-2239-14<\/td>\n<\/tr>\n
1621256000<\/td>\nTUBO<\/td>\n1621-2560-00<\/td>\n<\/tr>\n
1627243000<\/td>\nTUBO<\/td>\n1627-2430-00<\/td>\n<\/tr>\n
1639660506<\/td>\nHEAT EXCHANGER F12<\/td>\n1639-6605-06<\/td>\n<\/tr>\n
2205710668<\/td>\nLAMP A22-LED230-BA9SW<\/td>\n2205-7106-68<\/td>\n<\/tr>\n
1614833900<\/td>\nTUBO<\/td>\n1614-8339-00<\/td>\n<\/tr>\n
1613976304<\/td>\nCABLE (TRACING 2500MM)<\/td>\n1613-9763-04<\/td>\n<\/tr>\n
1617439400<\/td>\nINSULATION HE 3ROWS<\/td>\n1617-4394-00<\/td>\n<\/tr>\n
1621241800<\/td>\nGEAR WHEEL-FILME COMPRESSOR<\/td>\n1621-2418-00<\/td>\n<\/tr>\n
1627012100<\/td>\nFRAME TRIPLEX MED<\/td>\n1627-0121-00<\/td>\n<\/tr>\n
0333222900<\/td>\nWASHER-SPRING<\/td>\n0333-2229-00<\/td>\n<\/tr>\n
1901010130<\/td>\nLock spring<\/td>\n1901-0101-30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"

The Atlas Copco 1616635681 is the OFS Q-21 oil-free screw element, the compression stage that delivers air with no lubricant entering the compression chamber. Atlas Copco records the unit as serialized, so each element carries its own number back to its build record. Packed, the stage measures 126 \u00d7 86 \u00d7 85 cm and weighs 904.00 kg, and it is built in Belgium. Send us the model and serial number from your compressor nameplate together with the number on the stage being replaced, and Seadweer confirms the match before you order.<\/p>","protected":false},"featured_media":8011,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[3692],"product_cat":[3688],"product_tag":[3691],"class_list":["post-8017","product","type-product","status-publish","has-post-thumbnail","product_brand-atlas-copco","product_cat-air-ends","product_tag-air-compressor-parts","first","instock","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/product\/8017","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/comments?post=8017"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/media\/8011"}],"wp:attachment":[{"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/media?parent=8017"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/product_brand?post=8017"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/product_cat?post=8017"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.compressorpartsmall.com\/es\/wp-json\/wp\/v2\/product_tag?post=8017"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}