Airtac SAIJ40 Adjustable Cylinder SAIJ40X270-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40X270-30S 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40X270-30S
The AirTAC SAIJ40X270-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 240-270mm usable travel window, letting you dial back the nominal 270mm stroke by up to 30mm during machine commissioning. The integrated magnet (-S) supports position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches mounted in the dual-side sensor grooves.
Unlike a fixed-stroke SAI unit, this adjustable model uses an external rear stopper to fine-tune the retract end position without adding external stops. The extruded aluminum barrel maintains a standard ISO 15552 mounting footprint. The PT tapered port thread and carbon steel rod are standard for this 40mm bore class, operating reliably at speeds between 30-800mm/s.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X270-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40X270-30S |
|---|---|
| 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 SAIJ40X270-30S
| 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 SAIJ40X270-30S Is Used
Changeover Calibration
Fine-tune the 240-270mm retract position on packaging lines when switching between different product sizes without swapping hardware.
Variable End-Stop Setup
Dial in the exact end-of-stroke position during machine commissioning using the rear screw, avoiding the need for external mechanical stops.
Sensor-Driven Positioning
Leverage the integrated magnet with CMSE or DMSE sensors to confirm adjustable end positions in automated assembly fixtures.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40X270-30S the Right Cylinder?
Choose this 40mm bore cylinder when you need 628N push force at 0.5 MPa but require variable end-stops for product changeovers. If your application demands less force, the 32mm bore offers 402N; for heavier loads, the 50mm bore provides 982N. Because the 270mm stroke exceeds 300mm is false here, but always ensure adequate guiding for longer travels. To replace an ISO 15552 cylinder, match the 40mm bore, 270mm stroke, 30mm adjustment, PT port thread, and the -S magnet requirement.
The rear adjuster acts strictly as a travel stop, not a lock. It cannot hold a load without live air pressure. If your setup requires true load-holding without continuous air, consider the AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder series instead. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
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 SAIJ40X270-30S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster screw allows you to shorten the effective stroke by up to 30mm, creating a 240-270mm usable travel window. It acts as a mechanical stop to set the end position and does not lock the load without air pressure.
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