Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50
The AirTAC SAIJ40X250-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 250 mm travel back by up to 50 mm, creating a precise 200-250 mm usable window. This built-in mechanical stopper enables fine end-position tuning at commissioning without swapping the cylinder or adding external stops. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance in washdown or chemically exposed environments.
This model uses a PT tapered port thread and relies on variable air cushions at both ends to decelerate the load. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure. For applications requiring position holding without continuous air, consider the SAIL or BSAI locking cylinder variants. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic switches if a magnet is added later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 SAIJ40BX250-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SAIJ40BX250-50 Is Used
Product Changeover
Dial in the 200-250 mm travel window on packaging lines running different carton lengths without physically swapping out the actuator.
Machine Setup
Fine-tune the retract end-stop during initial commissioning to perfectly time the tooling approach without machining custom spacers.
Corrosive Environments
Leverage the SUS304 stainless steel rod for reliable actuation in food processing or light chemical washdown areas requiring strict ISO 15552 dimensions.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50 the Right Cylinder?
Choose this 40 mm bore when your application requires approximately 628 N of push force at 0.5 MPa, but you need the flexibility to dial in the exact end-of-stroke position during machine setup or product changeover. If your process demands less force, stepping down to a 32 mm bore yields 402 N. The 50 mm adjustment range is ideal for lines running multiple product sizes, replacing the need to stock several fixed-stroke SAI cylinders.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 250 mm stroke, 50 mm adjustment code, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 250 mm stroke is relatively long for this bore size, an external guide is recommended to prevent excessive side-loading on the M12x1.25 rod thread.
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 SAIJ40BX250-50 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 50 mm, providing a usable travel window of 200 to 250 mm. It acts as a mechanical stop to fine-tune the end position and relies on the air cushion for deceleration.
At a 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. It can achieve up to 1130 N of push force at 0.9 MPa.
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