Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50
The AirTAC SAIJ125X900-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. Its 900mm nominal stroke can be precisely dialed back by up to 50mm, creating an 850-900mm usable travel window for exact end-position tuning during machine commissioning. This eliminates the need to physically swap cylinders or bolt on external stoppers when aligning long-stroke movements.
Built with an extruded aluminum barrel featuring dual sensor grooves, this model utilizes a SUS420J2 stainless steel rod (code A) for enhanced durability against moisture. It operates at speeds of 30-500mm/s and uses PT tapered port threads (G1/2). The rear adjuster acts purely as a travel stop to set the deceleration point alongside the air cushions, meaning it cannot hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125AX900-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125AX900-50 Is Used
Machine Changeover
Dial in the 850-900mm travel window during product size transitions to set new retraction endpoints without changing the physical cylinder setup.
Material Handling
Ideal for long-stroke sorting or diverting tasks where the 50mm rear stopper fine-tunes the exact discharge position of heavy components.
Assembly Line Setup
Perfect for initial equipment commissioning, allowing technicians to trim the 900mm stroke precisely to the fixture without adding external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-50 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires the 6136N push force at 0.5MPa (or 8590N at 0.7MPa) and on-the-fly end-stop modifications. If your setup demands less force, stepping down to a 100mm bore provides 3927N at 0.5MPa; if you need more power, a 160mm bore yields 10053N. Choose this adjustable-stroke SAIJ variant over a fixed SAI cylinder when you anticipate product changeovers or need to fine-tune the retraction point without mechanical rework.
Because this model features a 900mm stroke, the 32mm rod diameter and M27x2 rod thread will still experience leverage forces, so an external guide is recommended to prevent side-loading damage. For ISO 15552 replacement matching, ensure you specify the 125mm bore, 900mm stroke, 50mm adjustment, PT G1/2 port, and your required mounting style. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, but omits FB, CA, CB, and CR options. If your process requires the load to be held without live air, you must integrate an external rod lock or look at the SAIL or BSAI series, as this cylinder's adjuster is not a locking mechanism.
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 SAIJ125AX900-50 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7MPa, the push force rises to 8590N.
The rear adjuster screw allows you to shorten the 900mm nominal stroke by up to 50mm, providing an effective 850-900mm travel window. It acts as a mechanical stop to set the end position and works with the air cushions for deceleration, but it does not lock the load without live air pressure.
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