Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40
The AirTAC SAIJ125X155-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 155 mm nominal stroke that can be dialed back by up to 40 mm, yielding a precise 115-155 mm usable travel window for commissioning flexibility. Belonging to the 125 mm bore class, it delivers 6136 N of push thrust and 5734 N of pull thrust at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This model features a carbon steel piston rod with an M27x2 thread and PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. Air cushions at both ends manage deceleration, but note that the rear adjuster acts only as a travel stop, not a lock, so the load requires live air to maintain its position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-40 Is Used
Product Changeover
Quickly dial in the 115-155 mm travel window during packaging line format changes to accommodate different carton sizes without mechanical rebuilds.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy assemblies, using the rear stopper to fine-tune the final pressing depth accurately.
Machine Setup Tuning
Eliminate the need for external stopper blocks during initial commissioning by using the built-in 40 mm stroke adjustment to set exact retraction limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-40 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force combined with variable end-stop tuning. If the 6136 N push force at 0.5 MPa exceeds your requirements, stepping down to a 100 mm bore provides 3927 N. Conversely, if you need more power, the 160 mm bore offers 10053 N. The adjustable stroke is ideal for machine setups requiring fine end-position tuning during product changeovers without swapping cylinders or adding external stops. Because the stroke is 155 mm, side-load risks are moderate, but always ensure adequate external guiding for heavy loads.
For a direct ISO 15552 replacement match, verify a 125 mm bore, 155 mm stroke, 40 mm adjustment range, PT port threads, and the required mounting accessory. SAIJ supports a specific mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. If your mechanism needs to hold a load securely without continuous air pressure, this cylinder is insufficient; consider the SAIL (air-released lock) or BSAI (clamp-lock) variants instead.
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 SAIJ125X155-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it achieves a maximum push force of 11045 N.
The rear adjuster screw allows you to shorten the 155 mm nominal stroke by up to 40 mm, creating a usable travel range of 115-155 mm. This stopper only sets the end position and does not lock the load without live air pressure.
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