Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20S 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 SAIJ125AX290-20S
The AirTAC SAIJ125X290-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 270-290 mm from its 290 mm nominal stroke. Delivering 5734 N of pull force at 0.5 MPa, it handles heavy positioning tasks with precision. The extruded aluminum barrel features dual sensor grooves, and the -S magnet seamlessly integrates with CMSE reed and DMSE electronic solid-state switches for exact position feedback.
This variant features a SUS420J2 stainless steel rod (code A) for superior corrosion resistance and utilizes PT tapered port threads. The rear adjustment screw acts purely as a mechanical stop to dial in the retract end-position during commissioning; it does not hold the load without live air pressure. Mounting options are restricted to Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20S |
|---|---|
| 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 SAIJ125AX290-20S
| 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 SAIJ125AX290-20S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within a 270-290 mm window during machine commissioning to accommodate slight variations in tooling or fixture lengths.
Product Size Changeover
Quickly adjust the stroke end-position on packaging or assembly lines when switching between different product sizes, avoiding the need to bolt on external stops.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or lifts, using the rear screw to set the precise lower stopping point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-20S the Right Cylinder?
Choose this 125 mm bore cylinder when an 80 mm bore (2268 N pull) lacks the force to move your load, but you need the flexibility to fine-tune the end-stop on the fly without physically swapping components. The adjustable rear stopper is ideal for product changeovers, letting you trim up to 20 mm of travel directly on the machine. If your application requires the load to be held mechanically without continuous air pressure, the standard SAIJ adjuster will not suffice; you should instead select an SAIL (air-released lock) or BSAI (clamp-lock) cylinder. For a direct ISO 15552 replacement, match the 125 mm bore, 290 mm stroke, 20 mm adjustment, PT G1/2 port, mounting style, and -S magnet requirement.
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 SAIJ125AX290-20S FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, providing a usable travel window of 270-290 mm. It functions as a mechanical stop for end-position tuning and is not a lock; it cannot hold a load without live air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N. The maximum operating pressure is 1.0 MPa.
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