Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40S
The AirTAC SAIJ125X325-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, generating 6136 Newtons of pull force at 0.5 MPa, making it suited for heavy-duty handling. The integrated -S magnet enables position detection via CMSE reed or DMSE electronic solid-state sensors housed within the dual-side barrel grooves.
This specific SKU features a 325 mm nominal stroke paired with a 40 mm adjustment range, yielding a usable travel window of 285-325 mm. You can dial in the exact end-of-stroke position during commissioning without external stops. The carbon steel rod features an M27x2 thread, and air is supplied via PT tapered G1/2 ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125X325-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125X325-40S Is Used
Variable End-Stop Positioning
Fine-tune the retraction end-point within the 285-325 mm window during machine setup to accommodate different material lengths without changing the cylinder.
Heavy-Duty Product Changeover
Leverage the 6136N pull force and 40 mm adjustability to quickly adapt heavy clamping or lifting fixtures on automated lines processing varied product sizes.
Sensor-Driven Sequence Control
Utilize the -S magnet with DMSE electronic sensors to confirm the adjusted end-of-stroke position in PLC-controlled automated assembly routines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-40S the Right Cylinder?
Selecting this 125 mm bore makes sense when a 100 mm bore (offering 3927N push at 0.5 MPa) lacks the power for heavy payloads, but stepping up to a 160 mm unit would be excessive. The adjustable 285-325 mm travel window is ideal for production lines running mixed product sizes, allowing rapid changeover by simply turning the rear screw instead of physically swapping cylinders.
Because the 325 mm stroke is substantial, the M27x2 carbon steel rod will experience higher side-load stresses if left unsupported; an external guide rail is strongly recommended to prevent premature seal wear. Note that the rear adjuster is a travel stop, not a locking device; it cannot hold the load without live air pressure. For true load-holding, consider the SAIL or BSAI series. This model uses the SAIJ mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ125X325-40S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 Newtons of pull force and 8590 Newtons of push force. The maximum thrust is 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop that shortens the 325 mm nominal stroke by up to 40 mm, giving an effective travel window of 285-325 mm. It decelerates the end position but does not lock the load without live air pressure.
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