Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 290mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50S
The AirTAC SAIJ125X290-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 240-290mm usable travel window, allowing you to trim the 290mm nominal stroke by up to 50mm during commissioning. This built-in adjustability eliminates the need to swap cylinders or bolt on external stops when fine-tuning end positions.
This -S variant includes a magnet for CMSE reed and DMSE electronic sensors, which seat neatly into the sensor grooves on both sides of the extruded aluminum barrel. The 32mm carbon steel rod and M27x2 thread provide substantial rigidity, while the PT tapered port threads ensure a secure pneumatic connection. The rear adjuster acts strictly as a travel stop for deceleration and positioning, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 290 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125X290-50S Is Used
Product Size Changeovers
Dial in the 240-290mm travel window on the fly to accommodate different material lengths on a single line without swapping out the entire actuator.
Heavy Fixture Positioning
Leverage the 6136N thrust at 0.5 MPa to move heavy jigs, using the rear stopper to precisely set the retract distance during initial machine commissioning.
End-Stop Calibration
Fine-tune the retraction point on automated assembly lines to compensate for mechanical wear or sensor drift over time, ensuring consistent cycle ends.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50S the Right Cylinder?
Select this 125mm bore cylinder when an 80mm bore (2513N push at 0.5 MPa) lacks the thrust for your heavy fixture, but a 160mm bore is physically oversized. The adjustable 240-290mm window is perfect for machines processing multiple product sizes, letting operators dial in the exact retract end-position without changing the hardware. Because the 290mm stroke approaches the mid-range of this bore size, ensure your external guide can support the load, as the adjuster and air cushions only manage travel ends and do not hold the load without air pressure.
To match this ISO 15552 interchangeable cylinder, confirm the 125mm bore, 290mm nominal stroke, 50mm adjustment range, PT G1/2 port, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. For applications requiring true load-holding without live air, consider the SAIL or BSAI variants 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 SAIJ125 Adjustable Cylinder SAIJ125X290-50S FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 50mm. This creates a 240-290mm usable travel window for fine-tuning the retract position at commissioning without replacing the cylinder.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa, with a maximum speed of 30-500 mm/s.
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