Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20S 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 SAIJ125X290-20S
The AirTAC SAIJ125X290-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N pull force at 0.5 MPa. By integrating a 20mm external stopper mechanism, this 290mm nominal stroke unit provides an exact 270-290mm usable travel window. This built-in adjustability allows operators to fine-tune the retract end position during commissioning or product changeovers without physically swapping the cylinder or adding external stops.
Featuring an extruded aluminum barrel with integrated sensor grooves on both sides, this -S variant includes a magnet for position sensing. It interfaces seamlessly with AirTAC CMSE reed switches and DMSE solid-state electronic sensors. The 32mm carbon steel piston rod and M27x2 rod thread provide high structural rigidity, though with a 290mm stroke, an external guide is recommended to prevent excessive side-loading on the bearing.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20S |
|---|---|
| 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 SAIJ125X290-20S
| 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 SAIJ125X290-20S Is Used
Product Changeover
Dial in the 270-290mm retract position on the fly when switching between packaging formats without changing cylinder hardware.
Press Fit Tuning
Precisely set the mechanical bottom-out point for heavy 6136N press operations during initial machine commissioning.
Variable Diverting
Adjust the stroke length to alter the diverting distance on a conveyor handling varying pallet sizes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20S the Right Cylinder?
Select this 125mm bore model when your application requires substantial thrust—delivering 8590N push force at 0.7 MPa—combined with variable end-stop positioning. If your machine demands less force, stepping down to a 100mm bore yields 3681N pull at 0.5 MPa, whereas upgrading to a 160mm bore provides 9425N pull for heavier payloads. The adjustable stroke is ideal for lines running multiple product sizes, replacing fixed-stroke SAI cylinders when exact end-position tuning is required. For a drop-in ISO 15552 replacement, match the 125mm bore, 290mm stroke, 20mm adjustment, PT tapered ports, and the -S magnet.
Because the 290mm stroke exceeds the 300mm threshold, an external guide should be used to support the load and prevent side-load damage. Remember that the rear adjuster acts only as a mechanical travel stop and does not hold the load without live air pressure; for true load-holding, consider the SAIL pneumatic lock or BSAI clamp-lock cylinders.
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 SAIJ125X290-20S FAQ
The rear adjusting screw acts as a mechanical stopper that lets you shorten the effective stroke by up to 20mm, creating a 270-290mm usable travel window. It sets the end position but does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
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Standard models usually ship in 3-4 days.
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