Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20 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 SAIJ125AX290-20
The AirTAC SAIJ125X290-20 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a usable travel window of 270 to 290 mm, allowing you to dial in the exact retract position during commissioning without adding external stops. The 125 mm bore generates 6136 N of pull force at 0.5 MPa, making it suited for heavy positioning tasks.
This variant features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch mounting. It operates at speeds of 30-500 mm/s and includes adjustable air cushions at both ends to manage kinetic energy.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20 |
|---|---|
| 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 SAIJ125AX290-20
| 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 SAIJ125AX290-20 Is Used
Heavy Press Positioning
Fine-tune the 270-290 mm retract distance precisely during machine setup to accommodate varying material thicknesses in heavy pressing operations.
Product Diversion Control
Adjust the stroke end-point on the fly to handle different package sizes on a conveyor line without physically replacing the actuator.
Machine Changeover
Rapidly reconfigure end-stops during product line changeovers, using the 20 mm adjustment window to dial in the exact required travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20 the Right Cylinder?
Choose this 125 mm bore when your application requires substantial force, such as the 6136 N pull at 0.5 MPa provided here. If your load demands less push, stepping down to an 80 mm bore yields 2268 N of pull, whereas moving up to a 160 mm bore provides 9425 N. The adjustable stroke is ideal for product-size changeovers on a packaging line, letting you fine-tune the retract end-point on the fly rather than swapping to a fixed-stroke SAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 290 mm stroke, PT port threads, and the chosen mounting accessory from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 290 mm stroke is substantial, ensure an external guide supports the load to prevent excessive side-loading on the rod. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true fail-safe holding, select an SAIL or BSAI cylinder.
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 SAIJ125AX290-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N at 0.7 MPa. The maximum force is 1251 kgf at 1.0 MPa.
The rear adjuster allows you to shorten the 290 mm nominal stroke by up to 20 mm, creating a usable travel window of 270 to 290 mm. This stopper fine-tunes the retract end-position but does not lock the load without continuous air pressure.
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