Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30S 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 SAIJ125X275-30S
The AirTAC SAIJ125X275-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 275 mm stroke that can be fine-tuned backward by up to 30 mm, yielding a precise 245-275 mm usable travel window for exact end-position calibration. Delivering 8590 N of push force at 0.7 MPa, it handles heavy actuation tasks while maintaining standard ISO 15552 mounting interchangeability.
This variant features a carbon steel piston rod and a PT tapered port thread. The -S suffix indicates an integrated magnet compatible with AirTAC CMSE reed and DMSE solid-state sensors, which mount neatly into the dual-side sensor grooves on the extruded aluminum barrel. The rear adjuster acts purely as a travel stop for commissioning flexibility and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30S |
|---|---|
| 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 SAIJ125X275-30S
| 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 SAIJ125X275-30S Is Used
Variable End-Stop Tuning
Dial in the exact 245-275 mm travel distance during machine commissioning to accommodate varying material thicknesses without mechanical modifications.
Heavy Assembly Pressing
Leverage the 8590 N push force at 0.7 MPa to seat large industrial components, using the rear stop to precisely limit the pressing depth.
Automated Changeover Systems
Adjust the retract position on the fly for production line format changes, utilizing the dual-side sensor grooves for flexible DMSE switch placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30S the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust—such as the 8590 N push force at 0.7 MPa—combined with variable end-stop positioning. If your process demands less force, stepping down to an 80 mm bore yields 3518 N at 0.7 MPa, whereas moving up to a 160 mm bore provides 14074 N. The 30 mm adjustment range is ideal for machine setups requiring product-size changeovers without physically swapping the cylinder or adding external stops.
Because the nominal 275 mm stroke falls below the 1500 mm maximum standard stroke, it is a stock-friendly size. However, at this length, the 32 mm rod diameter should still be paired with an external guide to prevent excessive side-loading on the unsupported rod. For applications needing true load-holding without continuous air pressure, this cylinder is not a lock; you should evaluate the SAIL pneumatic lock or BSAI clamp-lock series instead.
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 SAIJ125X275-30S FAQ
The rear adjuster acts as an external mechanical stop that shortens the effective stroke. For this model, the 275 mm nominal stroke can be dialed back by up to 30 mm, creating a usable travel window of 245-275 mm. It does not lock the load without live air pressure.
At 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 5734 N of pull force. The -S option includes a magnet for position sensing, designed to work seamlessly with AirTAC CMSE reed and DMSE electronic switches.
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