Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20S
The AirTAC SAIJ125X270-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 250 to 270 mm, allowing you to dial back the nominal 270 mm stroke by up to 20 mm during machine commissioning. This bore size delivers a substantial 8590 N push force at 0.7 MPa, making it suitable for heavy-duty positioning tasks.
Equipped with a -S magnet, the extruded aluminum barrel is compatible with AirTAC CMSE reed and DMSE electronic sensors, which seat cleanly into the dual-side sensor grooves. The PT tapered port threads (G1/2) and carbon steel rod handle high flow and structural demands, while the rear adjuster acts strictly as a travel stop to fine-tune the retract end without acting as a load-holding brake.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125X270-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125X270-20S Is Used
Heavy Press Fit Tuning
Dial in the exact bottoming position of a 270 mm press stroke within a 20 mm window to accommodate material thickness variations without re-engineering the fixture.
Product Changeover Diverter
Adjust the retract stopper by up to 20 mm to shift a heavy diverter arm for different package sizes on a high-throughput packaging line.
Large Assembly Fixture
Leverage 8590 N of thrust at 0.7 MPa to seat heavy automotive components, using the rear screw to fine-tune the final end-stop during initial machine setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20S the Right Cylinder?
Select this 125 mm bore when a 100 mm bore (5497 N push at 0.7 MPa) lacks the necessary force for heavy actuation, but you want to avoid stepping up to a massive 160 mm cylinder. The adjustable 250-270 mm travel window is ideal for product changeovers where exact end-position tuning is required without physically swapping cylinders or adding bulky external stops. For load-holding without continuous air pressure, this cylinder is insufficient; you must integrate an external pilot-operated check valve or choose an AirTAC SAIL or BSAI locking cylinder.
Because the 270 mm stroke exceeds the 300 mm threshold requiring external guidance, mounting this cylinder directly via the Basic, FA, LB, TC, FTC, TCM1, or TCM2 interfaces is acceptable without a separate side-load guide, provided the load is purely axial. To match this ISO 15552 replacement exactly, verify the 270 mm stroke, 20 mm adjustment range, PT G1/2 port, and the -S magnet requirement for your DMSE solid-state switches.
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 SAIJ125X270-20S FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 270 mm down to a minimum of 250 mm. It sets the travel end and deceleration point, but it does not lock or hold the load without live air pressure.
At a 0.7 MPa operating pressure, the SAIJ125X270-20-S generates 8590 N of push force and 5734 N of pull force. The maximum thrust at 1.0 MPa is 1251 kgf.
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