Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 290mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S
The AirTAC SAIJ125X290-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 290mm nominal stroke that you can dial back by up to 40mm, yielding a usable travel window of 250 to 290mm. This built-in stopper allows precise end-position tuning at commissioning without swapping the hardware or adding external stops.
In the 125mm bore class, it generates 6136N of push thrust and 5734N of pull thrust at 0.5MPa. The extruded aluminum barrel features sensor grooves on both sides, and because this SKU includes a magnet (-S), it works directly with AirTAC CMSE reed and DMSE electronic solid-state switches. The carbon steel rod and M27x2 thread handle high loads, while the PT tapered port seals tightly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 290 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×290 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S Is Used
Product Changeovers
Dial in the 250 to 290mm stroke window during format changes without swapping the cylinder or adding external shims.
Variable End Stops
Set precise retract positions for diverter arms or pushers handling different package sizes on the fly.
Heavy Machinery Setup
Leverage the 6136N thrust at 0.5MPa to move heavy jigs, fine-tuning the end-of-travel deceleration at commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S the Right Cylinder?
Choose this 125mm bore when you need heavy thrust beyond the 80mm class (which provides 2513N push at 0.5MPa) but less than the massive 160mm class (10053N push). The adjustable 250-290mm travel window is ideal for product-size changeovers on a line, letting operators fine-tune the retract end-stop without machining new spacers. For any stroke of 290mm, an external guide rail is recommended to prevent rod side-loading and premature seal wear.
Remember that the rear adjuster is a travel stop, not a locking device. The SAIJ125X290-40-S cannot hold a load without live air pressure; for true fail-safe load holding, select the SAIL pneumatic lock or BSAI clamp-lock series. This cylinder uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push thrust and 5734N of pull thrust. It can deliver up to 1251 kgf at 1.0MPa.
A rear screw stopper lets you shorten the 290mm nominal stroke by up to 40mm, creating a 250 to 290mm adjustable travel window. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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