Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40
The AirTAC SAIJ125X325-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its 325mm nominal stroke can be fine-tuned down by up to 40mm, creating a precise 285-325mm usable travel window for product changeovers. The extruded aluminum barrel features sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is added later.
This model uses a robust 32mm carbon steel rod with an M27x2 thread, paired with 40mm variable air cushions at both ends to manage heavy kinetic energy. The rear adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air pressure. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125X325-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125X325-40 Is Used
Machine Changeover
Dial in the 285-325mm travel window during product size changes without physically swapping the cylinder or adding external stopper blocks.
Heavy Fixture Positioning
Leverage the 6136N push force to move heavy machining fixtures, using the rear screw to fine-tune the exact clamping endpoint.
Assembly Line Timing
Adjust the retract end-position on the fly to synchronize multi-stage assembly stations without altering the pneumatic PLC timers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the thrust for your heavy fixtures, but a 160mm bore is physically oversized. The 40mm adjustment window is ideal for dialing in exact end positions at commissioning without swapping cylinders, unlike a fixed-stroke SAI. Because the 325mm stroke is substantial, always use an external guide to prevent excessive side loading on the M27x2 rod thread. If your process requires the load to be held mechanically without continuous air, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a lock.
To match this ISO 15552 dimensionally interchangeable cylinder, specify: 125mm bore, 325mm stroke, 40mm adjustment, PT tapered port thread, standard carbon steel rod, no magnet, and a mounting style from the SAIJ subset.
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 SAIJ125X325-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the 325mm nominal stroke by up to 40mm, providing a usable travel window of 285-325mm. It functions as a mechanical stop for end-position tuning and requires live air to hold the load.
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