Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 290mm 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
- Stroke290 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50
The AirTAC SAIJ40X290-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 240 to 290 mm, allowing you to dial back the nominal stroke by up to 50 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance.
This model uses PT tapered ports (G1/4) and includes variable air cushions at both ends to manage deceleration. The extruded aluminum barrel features sensor grooves on both sides for flexible switch placement. The rear stopper acts purely as a travel end stop and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 290 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 SAIJ40BX290-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×290 | 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 SAIJ40BX290-50 Is Used
Variable End Stops
Dial in the exact 240-290 mm travel distance during machine setup to accommodate different product sizes without changing hardware.
Commissioning Fine-Tune
Trim the retract position by up to 50 mm on-site to perfect timing and avoid mechanical crashes, replacing the need for external stopper blocks.
Line Changeover
Rapidly adjust the stroke end-point when switching the manufacturing line to a new package or component size.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50 the Right Cylinder?
Choose this 40 mm bore when you need precise end-position tuning without adding external stops or swapping cylinders. If your application requires less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa, whereas stepping up to a 63 mm bore provides 1559 N. The adjustable 240-290 mm window is ideal for product changeovers on a line.
Because the 290 mm stroke is substantial, the 16 mm rod and M12x1.25 thread will carry some side load, but an external guide is recommended for heavy lateral forces. To match this ISO 15552 interchangeable cylinder, specify: 40 mm bore, 290 mm stroke, 50 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 SAIJ40BX290-50 FAQ
At 0.5 MPa operating pressure, 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 screw acts as a mechanical stop that lets you shorten the effective travel from the 290 mm nominal stroke down to 240 mm. It sets the end position but does not lock the load without continuous air pressure.
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