Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30
The AirTAC SAIJ125X425-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 425 mm nominal travel to a precise 395-425 mm window. Built with a SUS420J2 stainless steel rod (option A) for enhanced durability against lateral stress, it delivers a robust 6133 N pull force at 0.5 MPa. The extruded aluminum barrel features sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is added later.
Unlike a fixed-stroke SAI cylinder, this model lets you fine-tune the retract end-position during commissioning without adding external stops. The PT tapered port threads ensure a tight, leak-free pneumatic connection, while the rear adjuster functions strictly as a travel stop, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125AX425-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125AX425-30 Is Used
Machine Changeover
Dial in the 395-425 mm travel window during product size changes without swapping out the entire cylinder.
End-Position Tuning
Fine-tune the retract stop during commissioning to hit exact tolerances without relying on external hard stops.
Assembly Line Conveying
Provide 6133 N of pulling force to move heavy pallets, adjusting the stroke slightly to accommodate different pallet sizes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (10053 N push) is oversized. The 30 mm adjustment range is perfect for product changeovers on a line where exact end-of-stroke positioning varies slightly. If the application requires holding the load without live air pressure, the SAIJ adjuster will not suffice; you must use a SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external rod lock.
With a 425 mm stroke, the M27x2 piston rod is subject to potential side-loads, so an external guide is recommended to prevent binding. This cylinder is dimensionally interchangeable per ISO 15552 and supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ125AX425-30 FAQ
At 0.5 MPa, it 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 screw acts as a mechanical stop, allowing you to shorten the 425 mm nominal stroke by up to 30 mm, resulting in a usable travel window of 395 to 425 mm. It is a stop, not a lock.
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