Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50S 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 SAIJ40BX290-50S
The AirTAC SAIJ40X290-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 240-290 mm, allowing you to dial back the nominal 290 mm stroke by up to 50 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between smaller 32 mm bores and 50 mm options.
This variant uses a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet for position sensing. The extruded aluminum barrel features sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic switches. Pneumatic connections use PT tapered ports, and the cylinder omits FB, CA, CB, and CR mounts, utilizing a focused set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50S |
|---|---|
| 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 SAIJ40BX290-50S
| 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 SAIJ40BX290-50S Is Used
Variable End-Stop Tuning
Dial in the exact 240-290 mm end position during machine commissioning without adding external stopper blocks or changing the cylinder.
Product Size Changeover
Quickly adapt the stroke length on packaging lines handling different carton sizes by adjusting the rear screw on the fly.
Corrosion-Resistant Actuation
Leverage the SUS304 stainless steel rod in washdown or humid manufacturing environments while tracking position with CMSE/DMSE sensors.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-50S the Right Cylinder?
Choose this 40 mm bore when 628 N of thrust at 0.5 MPa is sufficient, avoiding the excess air consumption of a 50 mm bore that yields 982 N. The 50 mm adjustment range is perfect for machinery requiring variable end-stops or frequent product-size changeovers, negating the need to physically swap a fixed-stroke SAI cylinder.
Because the 290 mm stroke exceeds 300 mm guidelines for unsupported loads, ensure external guide rails are used to prevent rod side-loading. Remember that the rear adjuster acts only as a travel stop and cannot hold the load without live air pressure; for true fail-safe load holding, consider the SAIL or BSAI series. As an ISO 15552 profile cylinder, it is dimensionally interchangeable with standard ISO mounting interfaces.
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 SAIJ40BX290-50S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It operates at speeds between 30-800 mm/s and uses PT G1/4 threaded ports.
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. This stopper only sets the end position; it does not lock the load without live air pressure.
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