Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10
The AirTAC SAIJ125X40-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 125mm bore generating 6136N of thrust at 0.5MPa, with a nominal 40mm stroke that can be dialed back by up to 10mm, yielding a precise 30-40mm usable travel window for commissioning. This built-in stopper allows you to fine-tune the retract end position without swapping hardware or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch mounting.
This heavy-duty pneumatic actuator uses a 32mm carbon steel rod and M27x2 rod thread to handle substantial side loads. It features PT tapered port threading (G1/2) and operates at speeds of 30-500mm/s. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125X40-10 Is Used
Variable End-Stop Machining
Dial in the exact clamping distance during tooling changes using the 10mm adjustment range, ensuring perfect positioning without machining custom spacers.
Product Changeover Lines
Adapt a heavy-duty 6136N press station to varying part sizes on the fly by tweaking the retract travel window from 40mm down to 30mm.
Commissioning Calibration
Fine-tune the end-of-stroke position during initial machine setup to absorb mechanical tolerances and achieve precise multi-axis alignment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10 the Right Cylinder?
Select this 125mm bore model when an application requires substantial thrust—stepping up from a 100mm bore increases push force at 0.5MPa from 3927N to 6136N. Choose the SAIJ adjustable-stroke variant over a fixed SAI cylinder when you need variable end-stops for product changeovers or precise machine setup. The rear screw mechanically sets the retract position, but remember it is a stop, not a lock. For load-holding without live air, use an external pilot-operated check valve or a SAIL locking cylinder.
To match this ISO 15552 interchangeable cylinder for replacement, verify the 125mm bore, 40mm nominal stroke, 10mm adjustment range, PT G1/2 port, and standard carbon steel rod. Mounting options are limited to the Basic, FA, LB, TC, FTC, TCM1, and TCM2 set, omitting FB, CA, CB, and CR brackets. Because this actuator lacks a -S magnet, it cannot host CMSE reed or DMSE electronic sensors without modification.
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 SAIJ125X40-10 FAQ
At 0.5MPa operating pressure, this 125mm bore double-acting cylinder provides 6136N of push thrust and 5734N of pull thrust. At its maximum 1.0MPa pressure, the push force reaches 1251kgf.
The rear adjuster screw acts as a mechanical stopper that shortens the effective stroke. For this 40mm nominal stroke model, you can trim the travel back by up to 10mm, creating a 30-40mm usable window to fine-tune end positions without external stops.
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