Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40
The AirTAC SAIJ125X270-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 230 to 270 mm, enabling precise end-position tuning at commissioning without swapping the cylinder or adding external stops. Driven by a 125 mm bore, it delivers 6136 N of push force at 0.5 MPa and operates at speeds of 30-500 mm/s.
This unit is equipped with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and uses PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the travel end; it does not hold the load without live air. For load-holding requirements without continuous pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125AX270-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125AX270-40 Is Used
Machine Changeover
Dial in the 230-270 mm travel window during product-size changeovers to set new end positions without physically swapping cylinders.
Assembly Presses
Leverage the 6136 N push force at 0.5 MPa for pressing operations while fine-tuning the exact bottoming position via the rear stopper.
Conveyor Diverter
Adjust the retract stroke on the fly to accommodate different package sizes moving down an ISO 15552 compatible production line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-40 the Right Cylinder?
Select this 125 mm bore model when an application requires substantial thrust—stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, while this SAIJ125X270-40 provides 6136 N. The adjustable stroke is ideal for machine setups requiring variable end stops or product-size changeovers, offering flexibility that a fixed-stroke SAI cylinder cannot. When ordering a replacement, verify the 270 mm stroke, 40 mm adjustment range, PT ports, and your mounting choice from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because the 270 mm stroke is 300 mm or greater, ensure proper guidance. The 32 mm rod diameter and M27x2 thread handle high side loads, but long unsupported strokes still require an external guide rail to prevent premature wear.
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 SAIJ125AX270-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 270 mm nominal stroke by up to 40 mm, creating a 230-270 mm usable travel window. It only sets the end position and does not lock or hold the load without live air pressure.
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