Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-40
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke290 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-40
The AirTAC SAIJ50X290-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 250-290 mm usable travel window, allowing you to trim the effective stroke by up to 40 mm during commissioning without swapping out the entire unit. Delivering 982 N of push force at 0.5 MPa, it handles robust positioning tasks while using a G1/4 port and a 20 mm rod.
This model uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides, ready for AirTAC CMSE reed or DMSE electronic switches if a magnet is added later. It also features variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-40 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 290 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | 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 SAIJ50 Adjustable Cylinder SAIJ50AX290-40 Is Used
Product Changeovers
Dial in the 250-290 mm travel window during format changes on packaging lines, using the rear screw to set new end positions rapidly without changing hardware.
Machine Setup Calibration
Fine-tune the final retracted position during initial commissioning, absorbing mechanical tolerances by trimming up to 40 mm off the nominal stroke.
Variable End Stops
Handle varying package sizes on a single conveyor diverter by adjusting the stroke length on the fly to meet specific pusher distances.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-40 the Right Cylinder?
Choose this 50 mm bore when an application requires around 982 N of push force at 0.5 MPa, stepping up from a 40 mm bore (628 N) or down from a 63 mm bore (1559 N). The adjustable-stroke design is ideal for machine setups requiring variable end-stops or product changeovers, whereas a fixed SAI cylinder is sufficient for static, unchanging travel limits. For a direct ISO 15552 replacement, match the 50 mm bore, 290 mm stroke, 40 mm adjustment, PT port thread, and desired mounting.
Because the nominal stroke is 290 mm, ensure adequate external guiding to prevent excessive side-loading on the rod. Remember that the rear adjuster acts only as a mechanical stop to set the travel end; it does not hold the load without live air pressure. For true load-holding in the event of air loss, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ50 Adjustable Cylinder SAIJ50AX290-40 FAQ
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The rear adjuster screw allows you to shorten the 290 mm nominal stroke by up to 40 mm, creating a usable travel window of 250 to 290 mm. It acts as a mechanical stop and does not lock the load without continuous air pressure.
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