Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40S 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 SAIJ125AX280-40S
The AirTAC SAIJ125X280-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 240-280 mm usable travel window, allowing you to dial back the nominal 280 mm stroke by up to 40 mm during commissioning. This bore size delivers 6136 N of push force at 0.5 MPa, making it suited to heavy-duty positioning tasks.
The piston rod is built from SUS420J2 stainless steel (code A) for enhanced corrosion resistance, and the -S option includes a magnet for position sensing. You can fit AirTAC CMSE reed or DMSE solid-state switches into the dual-side sensor grooves. The SAIJ mounting set omits FB, CA, CB, and CR options, utilizing Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40S |
|---|---|
| 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 SAIJ125AX280-40S
| 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 SAIJ125AX280-40S Is Used
Machine Changeovers
Fine-tune the 240-280 mm travel window during product size transitions without physically replacing the cylinder or repositioning hard stops.
Variable End Stops
Set precise retract positions on packaging lines to accommodate different carton sizes, using the rear screw to trim up to 40 mm of stroke.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures, relying on the adjustable stop for final placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (3927 N push at 0.5 MPa) lacks thrust but an 80 mm bore (2513 N) is too small. The adjustable stroke is ideal for product changeovers, letting you set variable end-stops without adding external stops or swapping the cylinder. For any stroke of 300 mm or more, ensure an external guide supports the load to prevent excessive side-loading on the rod.
This SAIJ model is dimensionally interchangeable per ISO 15552. To match this exact configuration, specify: 125 mm bore, 280 mm stroke, 40 mm adjustment, PT tapered port threads, SUS420J2 rod, and a -S magnet. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; 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 SAIJ125AX280-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder produces 6136 N of push force and 5734 N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as an external stop that lets you shorten the effective travel from 280 mm down to 240 mm. This allows precise end-position tuning at commissioning, but it is a stop, not a lock, and will not hold the load without live air pressure.
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