Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40
The AirTAC SAIJ125X350-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 350 mm stroke that can be fine-tuned backward by up to 40 mm, yielding a precise 310-350 mm usable travel window for exact end-position calibration. Belonging to the 125 mm bore class, it delivers 6136 N of push force at 0.5 MPa and utilizes a robust 32 mm carbon steel rod with an M27x2 thread.
This adjustable-stroke design eliminates the need to swap cylinders or bolt on external stops during machine setup or product changeovers. The rear mechanism acts purely as a travel stop and works alongside standard variable air cushions at both ends to decelerate the load. It does not function as a lock, so load holding requires live air pressure or a dedicated SAIL locking cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125X350-40 Is Used
Product Changeover
Dial in the 310-350 mm travel window during format size changes on a packaging line without swapping out the entire actuator.
End-Stop Calibration
Fine-tune the retraction end position during machine commissioning using the rear adjuster rather than adding external mechanical stops.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or workpieces while maintaining precise positioning control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when an application requires substantial thrust—6136 N at 0.5 MPa or 8590 N at 0.7 MPa—combined with on-the-fly end-position tuning. If your setup demands less force, stepping down to an 80 mm bore provides 2513 N of push force at 0.5 MPa. Because this model features a 350 mm stroke, the 32 mm rod should be adequately supported by an external guide to prevent excessive side-loading and premature seal wear.
The adjustable stroke is chosen over a fixed SAI cylinder when commissioning flexibility is paramount, allowing you to dial in the exact 310-350 mm travel distance without mechanical rework. To match this ISO 15552 footprint exactly, confirm the 125 mm bore, 350 mm stroke, PT tapered port thread, carbon steel rod, and the absence of a magnet (-S) for sensor switches. Mounting options are restricted to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X350-40 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster allows you to shorten the effective stroke by up to 40 mm from the nominal 350 mm, creating a 310-350 mm travel window. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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