Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20
The AirTAC SAIJ40X350-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 330-350 mm, letting you dial back the nominal 350 mm stroke by up to 20 mm during commissioning. Belonging to the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for medium-duty handling tasks.
This variant is built with a SUS304 stainless steel rod for superior corrosion resistance in harsh environments. It uses a PT tapered port thread and omits the standard magnet, meaning position sensing via CMSE or DMSE switches is not supported out of the box. The extruded aluminum barrel includes sensor grooves on both sides, and the cylinder relies on variable air cushions at both ends to decelerate the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAIJ40BX350-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SAIJ40BX350-20 Is Used
Machine Changeover
Quickly fine-tune the retract end-position by up to 20 mm when switching between product sizes on a shared production line.
Variable End Stops
Dial in the exact 330-350 mm travel distance required for positioning stops without physically replacing the actuator.
Corrosive Environments
Leverage the SUS304 stainless steel rod for reliable medium-force actuation in washdown or chemically exposed settings.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20 the Right Cylinder?
Select this 40 mm bore model when your application requires precise end-position tuning without adding external stops or swapping cylinders. If you need less force, the 32 mm bore offers 402 N of push force at 0.5 MPa; if your load demands more, stepping up to the 50 mm bore provides 982 N. Because this is a 350 mm stroke, the 16 mm rod and M12x1.25 thread will experience greater leverage forces, so an external guide is recommended to prevent excessive side-loading.
The rear adjuster acts strictly as a mechanical travel stop, not a load-holding lock. The cylinder will not maintain its position without live air pressure. For true fail-safe load holding, consider the SAIL (air-released lock) or BSAI (clamp-lock) series. To match this exact configuration for an ISO 15552 replacement, specify: 40 mm bore, 350 mm stroke, 20 mm adjustment, PT port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and no magnet.
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 SAIJ40BX350-20 FAQ
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N. The operational speed range for this 40 mm bore is 30-800 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from 350 mm down to 330 mm. It only sets the end position; it does not lock the load without live air pressure.
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