Airtac SAIJ40 Adjustable Cylinder SAIJ40X240-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40X240-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 240mm 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
- Stroke240 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 SAIJ40X240-20
The AirTAC SAIJ40X240-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 220 to 240 mm usable travel window, allowing you to dial back the effective stroke by up to 20 mm during commissioning without swapping out the unit. At 0.5 MPa, it delivers 628 N of push force and 528 N of pull force.
This extruded aluminum profile cylinder features a 16 mm carbon steel rod with an M12x1.25 thread, built to handle standard operational side-loads. It uses PT tapered port threading (G1/4) and includes adjustable air cushions at both ends to decelerate the piston smoothly. The rear stopper sets the retract end position, but it does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X240-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40X240-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 240 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 SAIJ40X240-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SAIJ40X240-20 Is Used
Changeover Calibration
Dial in the 220-240 mm travel window during machine setup to perfectly accommodate new product sizes without machining new hard stops.
End-Position Trimming
Fine-tune the retract distance by up to 20 mm on the fly to correct minor mechanical drift in packaging or assembly lines.
Variable Diverter Stroke
Adjust the actuator reach on the fly to handle different package widths moving through a sorting conveyor system.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40X240-20 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 402 N push at 0.5 MPa) is too weak, but a 50 mm bore (982 N push) is physically oversized. The 20 mm adjustment range is ideal for applications requiring fine end-position tuning or frequent product changeovers, saving the effort of adding external stops. If your process requires holding a load without continuous air pressure, a standard SAIJ is insufficient; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
To match this ISO 15552 interchangeable cylinder for a replacement, verify the 40 mm bore, 240 mm nominal stroke, 20 mm adjuster, PT G1/4 port, and the absence of a magnet (-S). Because the 240 mm stroke is moderately long, ensure adequate external guiding to prevent excessive side-loading on the rod.
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 SAIJ40X240-20 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 240 mm nominal stroke by up to 20 mm, creating a 220 to 240 mm usable travel window. It only sets the end position and does not hold the load without live air pressure.
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