Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20S
The AirTAC SAIJ125X275-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 255-275 mm, letting you dial back the nominal 275 mm stroke by up to 20 mm during commissioning without adding external stops. Equipped with a magnet, it integrates seamlessly with AirTAC CMSE reed and DMSE electronic solid-state sensors mounted in the dual-side barrel grooves.
Delivering 6136 N of pull force at 0.5 MPa (and up to 11045 N push at 0.9 MPa), this 125 mm bore actuator handles heavy industrial loads. The carbon steel rod uses an M27x2 thread, and the PT tapered port is G1/2. The rear adjuster acts purely as a mechanical travel stop to fine-tune end positions; it is not a lock and cannot hold loads without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-20S Is Used
Machine Changeover
Dial in the exact 255-275 mm end-stop during product size transitions on a packaging line without physically replacing the actuator.
Heavy Pressing
Leverage the 6136 N pull force at 0.5 MPa for robust clamping and pressing tasks requiring precise final position tuning.
Sensor Integration
Use the built-in magnet with DMSE electronic sensors in the profile grooves to confirm exact adjusted positions within the travel window.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-20S the Right Cylinder?
Select this 125 mm bore model when an 80 mm cylinder's 2513 N pull force is insufficient for your heavy-duty application, but a 160 mm bore is oversized. The adjustable 255-275 mm stroke is ideal for product changeovers where exact end-position tuning is required without physically swapping the cylinder. If your machine requires true fail-safe load holding without continuous air, pair this actuator with an external rod lock or choose related AirTAC series like the SAIL or BSAI.
For dimensionally interchangeable ISO 15552 replacements, match the 125 mm bore, 275 mm stroke, 20 mm adjustment, G1/2 PT port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the 275 mm stroke is substantial, ensure adequate external guiding to prevent excessive side-loading on the M27x2 rod thread.
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 SAIJ125X275-20S FAQ
At 0.5 MPa it provides 6136 N pull and 8590 N push. At 0.9 MPa the push force reaches 11045 N. The maximum force is 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop that shortens the effective travel from 275 mm down to 255 mm. It only sets the end position; it does not lock or hold the load without live air pressure.
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