Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 270mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke270 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40
The AirTAC SAIJ40X270-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down to 230 mm from its 270 mm nominal stroke. Delivering 628N of push force and 528N of pull force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads.
This adjustable-stroke model uses a rear mechanical stopper to set the travel end, meaning it acts as a positioning limit rather than a load-holding lock. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to add CMSE or DMSE switches later if position detection is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 270 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX270-40 Is Used
Machine Changeover
Dial in the 230-270 mm travel window during product size changes without replacing the cylinder or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract stroke at commissioning to compensate for mechanical wear or assembly tolerances in the fixture.
Variable End Stops
Adjust the travel end dynamically for automated processes that require flexible material positioning before ejection.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40 the Right Cylinder?
Choose this 40 mm bore when you need 628N of thrust at 0.5 MPa and a commissioning window to dial in exact end positions without swapping cylinders. If your application requires less force, stepping down to a 32 mm bore provides 402N, while moving up to a 50 mm bore yields 982N. Because the 270 mm stroke exceeds 300 mm is not an issue here, but long unsupported strokes still need an external guide to prevent rod side-load damage.
The rear adjuster only trims the retract end position and does not hold the load without live air pressure. For true load-holding without continuous air, consider the SAIL (air-released lock) or BSAI (clamp-lock) variants. This SAIJ model shares the exact ISO 15552 mounting interface and supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40 Adjustable Cylinder SAIJ40BX270-40 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw lets you shorten the nominal 270 mm stroke by up to 40 mm, creating a usable travel window of 230-270 mm. It functions as a mechanical stop for end-position tuning and is not a lock that holds the load without air pressure.
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