Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-40
The AirTAC SAIJ40X225-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 225 mm stroke that can be fine-tuned backward by up to 40 mm, creating a usable travel window of 185 to 225 mm. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and operates at speeds of 30-800 mm/s.
This adjustable model lets you dial in the retract end-position during commissioning without swapping hardware or adding external stops. The rear mechanism acts purely as a travel stop, not a lock, meaning it cannot hold a load without live air pressure. It uses a PT tapered port thread and supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 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 SAIJ40BX225-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 SAIJ40BX225-40 Is Used
Machine Changeover
Quickly adjust the 185-225 mm travel window during product size changes without replacing the cylinder or bolting on external stops.
End-Position Tuning
Fine-tune the retract end-position at commissioning to dial in exact mechanical stops, preventing overshoot and ensuring precise alignment.
Variable Stops
Ideal for diverter arms on conveyors where the stroke length must be occasionally shortened to accommodate different package sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-40 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires 628 N push force at 0.5 MPa but demands variable end-stops for product changeovers. If your setup needs less force, stepping down to a 32 mm bore yields 402 N; stepping up to a 50 mm bore provides 982 N. Choose the SAIJ adjustable version over a fixed SAI when you need to trim the travel distance on the fly. To replace an ISO 15552 cylinder, match the 40 mm bore, 225 mm stroke, 40 mm adjustment, PT port, and mounting style. Since this unit lacks a magnet (-S), it will not work with CMSE or DMSE sensors without a configuration change. For any stroke of 225 mm, ensure external guides support the load to prevent excessive rod side-loading.
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 SAIJ40BX225-40 FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 40 mm, providing a usable travel window of 185 to 225 mm. It only sets the travel end and does not lock or hold the load without continuous air pressure.
At 0.5 MPa operating pressure, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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