Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-100
The AirTAC SAIJ125X225-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel by up to 100 mm. This yields a usable stroke window of 125 to 225 mm, letting you dial in the exact retract end-position during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
In this 125 mm bore configuration, the carbon steel rod and M27x2 thread provide a robust interface for heavy loads, delivering 6136 N of push force at 0.5 MPa and up to 11045 N at 0.9 MPa. The integrated variable air cushions at both ends work alongside the rear stopper to manage deceleration, while the PT tapered port threads ensure a tight, reliable pneumatic connection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAIJ125X225-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SAIJ125X225-100 Is Used
Variable End-Stop Tuning
Dial in the retract position from 125 to 225 mm during machine commissioning to achieve precise end-stop locations without machining custom spacers.
Product Changeover Lines
Adapt automated packaging or forming lines to different product lengths rapidly by adjusting the rear stopper screw rather than replacing the cylinder.
Heavy Assembly Pressing
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the adjustable stroke to compensate for material thickness variations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-100 the Right Cylinder?
Select this adjustable-stroke model when your machine setup requires frequent product-size changeovers or fine-tuning of the end-of-travel position without swapping out the entire actuator. If your application demands less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa; conversely, moving up to a 160 mm bore provides 10053 N. Remember that the rear adjuster is strictly a travel stop, not a locking device, so it will not hold the load without live air pressure. For true load-holding requirements, consider the SAIL or BSAI series.
Because the nominal stroke of 225 mm exceeds 300 mm only marginally, side-load risks are moderate, but an external guide is still recommended for heavy offsets. To replace an ISO 15552 cylinder, match the 125 mm bore, 225 mm stroke, 100 mm adjustment, PT G1/2 port, and the required mounting bracket from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). No magnet is specified for this SKU, so position sensing requires external or custom setups.
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 SAIJ125X225-100 FAQ
The rear adjuster screw acts as a mechanical stop that shortens the retract stroke by up to 100 mm. This creates a usable travel window of 125 to 225 mm, allowing you to fine-tune the end position at commissioning without altering the cylinder's fixed mounting.
At a standard 0.5 MPa operating pressure, the SAIJ125X225-100 provides 6136 N of push force and 5734 N of pull force. If the pressure is increased to 0.9 MPa, the push force reaches 11045 N.
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