Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50
The AirTAC SAIJ125X250-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 250mm stroke with a usable travel window of 200-250mm, allowing you to dial back the retract end position by up to 50mm during commissioning. Delivering 6136N of push force at 0.5MPa, it is built for heavy-duty positioning.
This variant uses a SUS420J2 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes dual sensor grooves, though this specific configuration omits the magnet for electronic sensing. The rear stopper solely sets the travel end and deceleration; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-50 Is Used
Variable Product Changeover
Dial in the exact 200-250mm retract distance on the fly when switching between different package sizes on a packaging line.
Heavy Fixture Positioning
Provides 6136N of thrust at 0.5MPa to move heavy machining fixtures, with fine-tuning to set precise end stops.
Commissioning End-Stop Tuning
Eliminates the need to bolt on external stopper blocks during machine setup by using the built-in 50mm rear adjuster.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-50 the Right Cylinder?
Select this 125mm bore when a 100mm bore (offering 3927N push at 0.5MPa) lacks the thrust for your heaviest pallets, but a 160mm bore (10053N) would be physically oversized. The 50mm adjustment window is ideal for production lines running variable product sizes, letting operators fine-tune the end stop without swapping hardware.
When replacing an ISO 15552 cylinder, match the 125mm bore, 250mm stroke, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because this model omits the -S magnet, position sensing requires external physical stops rather than CMSE or DMSE switches. For any application needing secure load-holding without continuous air, use an external rod lock or the AirTAC SAIL series instead of relying on the adjuster.
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 SAIJ125AX250-50 FAQ
At 0.5MPa it provides 6136N of push force and 5734N of pull force. If higher pressure is available, it can deliver up to 8590N at 0.7MPa.
The rear adjuster screw lets you shorten the 250mm nominal stroke by up to 50mm, creating a 200-250mm usable travel window. It acts as a mechanical stop to fine-tune the end position without replacing the cylinder.
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