Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75S 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 SAIJ125X325-75S
The AirTAC SAIJ125X325-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 250-325 mm usable travel window by allowing you to trim up to 75 mm from the 325 mm nominal stroke. In the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it well-suited for heavy positioning tasks.
This variant includes a standard carbon steel piston rod and a PT tapered port thread. Because it carries the -S magnet option, it directly supports AirTAC CMSE reed and DMSE solid-state sensors via the dual-side barrel grooves. The rear stopper mechanism allows precise end-position tuning during commissioning without adding bulky external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75S |
|---|---|
| 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 SAIJ125X325-75S
| 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 SAIJ125X325-75S Is Used
Machine Changeovers
Dial in the exact 250-325 mm stroke window during product size transitions on automated packaging lines without physically replacing the cylinder.
End-Position Tuning
Fine-tune the retract stopper during machine commissioning to perfect the final resting position of heavy actuators within a 75 mm adjustment band.
Heavy Assembly Presses
Leverage the 6136 N push force at 0.5 MPa to seat large components, using the adjustable travel limit to prevent over-travel and part damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) is insufficient, but a 160 mm bore is unnecessary. The adjustable stroke is perfect for product-size changeovers on a packaging line, letting you dial in the exact 250-325 mm travel window on the fly instead of swapping out a fixed-stroke SAI cylinder.
When integrating this model, note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. Because the 325 mm stroke is relatively long, the 32 mm rod and M27x2 thread will still experience leverage under side loads; always use an external guide rail to prevent rod binding. Remember that the rear adjuster acts only as a travel stop, not a lock—this cylinder will not hold a suspended load without live air pressure, so specify a SAIL or BSAI series for fail-safe load holding.
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 SAIJ125X325-75S FAQ
The rear adjuster screw acts as an external stopper, allowing you to shorten the effective stroke by up to 75 mm. This creates a usable travel window of 250-325 mm from the 325 mm nominal stroke, which can be fine-tuned during commissioning without swapping the cylinder.
At 0.5 MPa operating pressure, the SAIJ125X325-75-S provides 6136 N of push force and 5734 N of pull force. At its maximum 1.0 MPa operating pressure, it can deliver up to 1251 kgf.
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