Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30S
The AirTAC SAIJ125X280-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 250-280mm. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, utilizing a robust 32mm piston rod with an M27x2 thread. The rod is constructed from SUS420J2 stainless steel (code A) for enhanced corrosion resistance, and the PT tapered port threads ensure a reliable pneumatic connection.
Because the rear adjuster acts as a mechanical stop, it allows precise end-position tuning during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet (-S) is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches for precise position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAIJ125AX280-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAIJ125AX280-30S Is Used
Product Changeover Tuning
Dial in the exact end-position up to 30mm during format changeovers on heavy packaging lines without physically swapping the cylinder.
Variable End-Stop Pressing
Apply up to 6136N of pressing force at 0.5 MPa while fine-tuning the retraction point for different material thicknesses.
Heavy Load Positioning
Set precise retraction limits for heavy material handling, using the integrated magnet with DMSE sensors for confirmation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30S the Right Cylinder?
Choose this 125mm bore cylinder when an application requires heavy thrust (6136N at 0.5 MPa) alongside variable end-stop positioning. If you need less force, stepping down to an 80mm bore yields 2513N; if you need more, a 160mm bore provides 10053N. The adjustable stroke is ideal for machine setups requiring frequent product-size changeovers, providing a distinct advantage over a fixed-stroke SAI cylinder. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. To match this ISO 15552 cylinder, specify the 125mm bore, 280mm stroke, 30mm adjustment, PT port, SUS420J2 rod, and the -S magnet.
With a 280mm stroke, the 32mm rod provides excellent rigidity, but external guide rails should still be used to manage side loads on long unsupported extensions. Remember that the rear adjuster is a travel stop, not a locking device; this cylinder will not hold a load without live air pressure. For true load-holding, consider the SAIL or BSAI series.
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 SAIJ125AX280-30S FAQ
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At its maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke within a 250-280mm window. It is a travel stop, not a lock, meaning the cylinder requires live air to hold its position.
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