Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40S 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 SAIJ125X270-40S
The AirTAC SAIJ125X270-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, making it suitable for heavy-duty handling. The integrated -40 mm adjustment mechanism allows you to dial back the 270 mm nominal stroke, providing a usable travel window of 230 to 270 mm for precise end-position tuning during commissioning.
This model includes a magnet (-S) for position sensing and uses a standard carbon steel rod. It features PT tapered port threads (G1/2) and sensor grooves on both sides of the extruded aluminum barrel. The rear stopper screw acts purely as a travel end-deceleration device, meaning it sets the position but does not lock the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40S |
|---|---|
| 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 SAIJ125X270-40S
| 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 SAIJ125X270-40S Is Used
Machine Changeover
Quickly fine-tune the 230-270 mm travel window during product size changeovers on a production line, eliminating the need to physically swap cylinders or add external mechanical stops.
Heavy Positioning
Leverages the 6136N push force at 0.5 MPa to move heavy pallets or fixtures, using the rear adjuster to precisely set the retraction end-point without recoding the PLC.
Assembly Pressing
Ideal for light pressing or seating tasks where the exact bottoming-out position varies by a few millimeters, using the 40 mm adjustment range to find the perfect operational depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-40S the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires high thrust combined with variable end stops, such as accommodating different product sizes on a packaging line without swapping out the actuator. If your setup demands less force, stepping down to a 100 mm bore yields 3927N push at 0.5 MPa. For higher force requirements, a 160 mm bore provides 10053N.
Because the nominal stroke is 270 mm, you should ensure adequate external guidance to handle side loads, as the 32 mm rod and M27x2 thread require support over longer travels. To match this exact ISO 15552 replacement, verify the 125 mm bore, 270 mm stroke, 40 mm adjustment range, PT port threads, and the required -S magnet. If true load-holding is needed without air pressure, consider an external rod lock or the AirTAC SAIL series instead of relying on the adjuster.
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 SAIJ125X270-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. If operated at 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke from its nominal 270 mm down to 230 mm. This provides a 230-270 mm adjustable travel window for fine-tuning the end position during setup, though it does not lock the load without live air.
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