{"id":8103,"date":"2026-09-24T03:02:23","date_gmt":"2026-09-24T03:02:23","guid":{"rendered":"https:\/\/www.compressorpartsmall.com\/?post_type=product&p=8103"},"modified":"2026-09-28T03:53:42","modified_gmt":"2026-09-28T03:53:42","slug":"atlas-copco-1616747281-ofs-i-41-1616679281","status":"publish","type":"product","link":"https:\/\/www.compressorpartsmall.com\/es\/product\/atlas-copco-1616747281-ofs-i-41-1616679281\/","title":{"rendered":"Elemento de tornillo sin aceite Atlas Copco 1616747281 (1616679281) OFS I-41"},"content":{"rendered":"

El 1616747281<\/strong> is the OFS I-41, the Stage 2 element of the oil-free screw range, documented across the ZR 160, ZR 200, ZR 250 and ZR 275 frames, the ZT 160, ZT 200, ZT 250, ZT 275 and ZT 315 frames, and the ZR 315 VSD. Its record reaches back through the supersession chain 9825066081, 1616679281 and 1616747281<\/strong>, a line Atlas Copco itself published when the Stage 2 long Mk II design entered service.<\/p>\n

At 118.80 kg and a 60 \u00d7 44 \u00d7 37 cm envelope, this is the second-stage renewal that a standard workshop gantry handles without special arrangements, and the figures are published so the lift can be planned before the order is placed.<\/p>\n

This article sets out what the I-41 designation covers, how the supersession chain reads, which machines the parts lists name, and where the documented range ends.<\/p>\n

Identity of the 1616747281 Element<\/h2>\n

An element is the core compression stage of a screw compressor, and in the oil-free machines the compression train is split into two stages in series. The 1616747281<\/strong> fills the Stage 2 position: it takes the partly compressed air from the first stage and raises it to the final discharge pressure.<\/p>\n

Because the second stage works at the highest pressure in the machine, its rotors and bearings carry the heaviest load in the train, and its condition decides the discharge temperature and the delivered flow of the whole unit. That is why the 1616747281<\/strong> se confirma compar\u00e1ndola con un registro del compresor, en lugar de con una descripci\u00f3n.<\/p>\n

What the OFS I-41 Designation Covers<\/h3>\n

OFS is the oil-free screw designation, and I-41 is the element code Atlas Copco records for this stage. The parts lists print it as SERVICE STAGE O.F.S. I-41, and the item record carries the short form OFS I-41; both name the same unit.<\/p>\n

Atlas Copco prints the number in two forms. The ten-digit form 1616747281 is what the item record carries, and 1616 7472 81 is the printed form used across the parts documents. The nameplate of the element carries the printed form, so a fitter reading the old unit and a planner quoting the item record always land on the same stage.<\/p>\n

The Supersession Chain from 9825066081<\/h3>\n

El 1616747281<\/strong> did not appear as a fresh number; it continues a line Atlas Copco documented publicly. The historical service news from December 2001 announced the Stage 2 long Mk II design for the ZR\/T 160-275 frames and the ZR 315 VSD, and it recorded the old Stage 2 element 9825 0660 81 as superseded by 1616 6792 81.<\/p>\n

The chain therefore reads 9825066081, then 1616679281, then 1616747281<\/strong>, and the current number is the one the present parts lists carry. The evolution matters in practice because machines documented under the older numbers draw from the same Stage 2 position, and the parts records tie the three references together.<\/p>\n

A supersession chain is confirmed reference by reference, not assumed from the model family: the service news covers the first step, and the current parts lists cover the last one, which is what lets Seadweer quote the 1616747281<\/strong> against machines whose files still carry either older number.<\/p>\n

\"Atlas
Atlas Copco OFS I-41 1616747281-1616679281 (1)<\/figcaption><\/figure>\n

Machines Documented for the 1616747281<\/h2>\n

Atlas Copco’s official parts lists and equipment records name the I-41 stage across the ZR and ZT ranges in three groups, collected in the table below and taken in turn afterwards.<\/p>\n\n\n\n\n\n\n
Grupo<\/td>\nUnidades documentadas<\/td>\n<\/tr>\n
ZR series, 160-275 platform<\/td>\nZR 160, ZR 200, ZR 250, ZR 275<\/td>\n<\/tr>\n
ZR series VSD<\/td>\nZR 315 VSD<\/td>\n<\/tr>\n
ZT series<\/td>\nZT 160, ZT 200, ZT 250, ZT 275, ZT 315<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The ZR 160-275 Records<\/h3>\n

The parts list for the ZR\/ZT 160-275 platform carries a Compressor element 2 section, and it lists 1616 7472 81 as the O.f.s. stage at ref. 1030. That single listing covers the platform, and the individual frames inside it are documented further: the ZR 275 record names the stage directly as SERVICE STAGE O.F.S. I-41, and equipment records for the ZR 160 and ZR 250 in service quote the same element number against specific machines.<\/p>\n

The ZR 200 sits inside the same continuous 160-275 platform, with the ZR 160, ZR 250 and ZR 275 documented on either side of it, so the platform record carries the frame as well. For a plant running several of these frame sizes, one Stage 2 reference across the group simplifies the spares position: one identification, held once, covering the whole set.<\/p>\n

The ZR 315 VSD Record<\/h3>\n

The VSD documentation has its own element section for the ZR 315 VSD, and it lists the 1616747281<\/strong> as the OFS I-41 alongside the service stage 1616 5904 91. That listing reaches back to the same 2001 service news, which named the ZR 315 VSD inside the Stage 2 long Mk II application range from the start.<\/p>\n

The variable-speed drive changes how the machine modulates, and the Stage 2 element underneath stays the I-41 position of the platform, confirmed from its own parts list rather than inferred from the fixed-speed records.<\/p>\n

The ZT Series Records<\/h3>\n

The ZT frames share the platform with their ZR counterparts, and the same 160-275 parts list records 1616 7472 81 as the O.f.s. stage for the ZT 160, ZT 200, ZT 250 and ZT 275. The ZT 315 is documented through its own parts information, which names the I-41 number for the machine.<\/p>\n

That spread means an oil-free site running ZR and ZT frames side by side draws one Stage 2 element reference for the whole fleet, and the identification work happens once instead of per machine.<\/p>\n

The I-41 and I-42 Stages<\/h3>\n

The parts information for the large frames names a sibling stage beside the I-41: 1616747282, the OFS I-42. The two numbers sit in the same product family but they are different elements, and the machine record decides which one a given unit takes.<\/p>\n

That is also why the 1616747281<\/strong> is confirmed against the element number being renewed or the machine parts list, never against the family name alone: the I-41 and the I-42 look alike on the outside and answer to different numbers.<\/p>\n

Donde termina el \u00e1rea de distribuci\u00f3n documentada<\/h3>\n

The documented coverage stops where the parts lists stop naming the I-41. The ZR 315 in its non-VSD builds and the ZT 315 VSD have no parts list in hand naming the 1616747281<\/strong>, so they stay outside the confirmed range until a machine record says otherwise, and coverage follows the parts list for each serial number.<\/p>\n

That is also why the range is not widened to other oil-free frames: the platform documentation names the I-41 where it applies, and the check against the machine nameplate and the old element number is what keeps the right stage matched to the right frame.<\/p>\n

\"Atlas
Atlas Copco OFS I-41 1616747281-1616679281 (2)<\/figcaption><\/figure>\n

What the Oil-Free Screw Stage Does<\/h2>\n

Oil-free compression runs on a condition the I-41 is built around: no oil enters the compression chamber, so the air that leaves the 1616747281<\/strong> carries no injection oil to separate out downstream.<\/p>\n

Dry Compression in the Second Stage<\/h3>\n

The rotor pair turns in a precision-bored housing with the clearances sealed by tight machining tolerances and by timing gears keeping the rotors from touching. Because no oil film does the sealing, the stage depends on its bearings, its seals and its cooling circuit, and the air path stays clean from inlet to discharge.<\/p>\n

Precision rolling bearings take the radial and thrust loads of the shafts, and the cooling between the stages brings the air temperature down before the 1616747281<\/strong> raises it to the final pressure. Everything about the air quality after the machine \u2014 the dryers, the filters, the point of use \u2014 is sized around the oil-free condition this stage preserves.<\/p>\n

Renovados como una sola Asamblea<\/h3>\n

El 1616747281<\/strong> Se renueva como una unidad completa, en lugar de reconstruirse in situ. El par de rotores, la carcasa y los cojinetes se suministran como un \u00fanico conjunto de f\u00e1brica, con los puertos y la interfaz de accionamiento configurados para las m\u00e1quinas a las que dan servicio.<\/p>\n

Eso es lo que hace que la renovaci\u00f3n sea un cambio planificado en lugar de un proyecto de taller: se retira la plataforma antigua, se coloca la nueva sobre sus superficies de montaje y la m\u00e1quina vuelve a su registro con un nuevo n\u00famero de serie que registrar.<\/p>\n

Handling the 118.8 kg Stage<\/h2>\n

At 118.80 kg and 60 \u00d7 44 \u00d7 37 cm, the 1616747281<\/strong> sits in the two-person-plus-gear class: above manual carrying, well within the reach of a workshop gantry or an engine crane rated for the mass. The figures describe the unit as it is supplied, and they shape the route from the unloading point to the machine.<\/p>\n

Elevaci\u00f3n y acceso<\/h3>\n

The 60 \u00d7 44 \u00d7 37 cm envelope reaches the site packed, and the openings it has to pass are measured in advance: doorway widths, gantry height and the standing room in front of the machine. A gantry or crane rated for the 118.80 kg of the 1616747281<\/strong> cubre el elevador, y el sistema de eslingas mantiene la carga nivelada durante todo el traslado.<\/p>\n

El cojinete se sostiene por sus caras de montaje y nunca por su eje. Las tapas de los extremos permanecen en su sitio hasta el momento de la instalaci\u00f3n, de modo que nada entra en contacto con el orificio mientras la unidad est\u00e1 al descubierto.<\/p>\n

La puesta en marcha y la primera carrera<\/h3>\n

Antes de cerrar la m\u00e1quina, se limpian las superficies de montaje y se comprueba que no presenten rebabas; se inspecciona el acoplamiento para detectar posibles signos de desgaste y se comprueban la alineaci\u00f3n y el sentido de giro. Una vez en marcha, la m\u00e1quina se pone en funcionamiento sin carga y se supervisa hasta que las lecturas se estabilicen.<\/p>\n

Durante el primer periodo de funcionamiento se registran la temperatura de descarga, la presi\u00f3n y las vibraciones, y se vuelve a apretar los elementos de fijaci\u00f3n tras las primeras horas. Ese breve registro se convierte en la referencia para todas las comprobaciones posteriores del 1616747281<\/strong>.<\/p>\n

\"Atlas
Atlas Copco OFS I-41 1616747281-1616679281 (3)<\/figcaption><\/figure>\n

Signos de desgaste y periodicidad de renovaci\u00f3n<\/h2>\n

Renovaci\u00f3n de la 1616747281<\/strong> Se decide en funci\u00f3n de las condiciones, m\u00e1s que de un recuento fijo de horas. Hay dos l\u00edneas de datos que sustentan en gran medida esa decisi\u00f3n, y ambas se interpretan mejor como tendencias observadas a intervalos fijos, m\u00e1s que como cifras aisladas.<\/p>\n

Indicadores que miden el desgaste<\/h3>\n

Las superficies del rotor y los cojinetes son las primeras en sufrir cambios. A medida que se desgastan, las holguras de funcionamiento aumentan y la etapa suministra menos aire con la misma potencia en el eje, por lo que la disminuci\u00f3n del caudal de aire libre, medido a la presi\u00f3n nominal, es el valor que se observa tras ese cambio. La temperatura de descarga con una carga constante var\u00eda en consecuencia.<\/p>\n

Hay otras tres lecturas que recogen la misma historia:<\/p>\n