Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30 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 SAIJ125X280-30
The AirTAC SAIJ125X280-30 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical adjuster, allowing you to fine-tune the retract end position during commissioning. It provides a usable travel window of 250-280mm from its 280mm nominal stroke, meaning you can dial back the stroke by up to 30mm without adding external stops or swapping the unit. Built with an extruded aluminum barrel, it is dimensionally interchangeable per ISO 15552 standards.
In the 125mm bore class, this model delivers substantial thrust, generating 8590N of push force at 0.7MPa and reaching 11045N at 0.9MPa. The carbon steel piston rod features an M27x2 thread, and the cylinder includes adjustable air cushions at both ends to manage heavy impact loads. Note that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30 |
|---|---|
| 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 SAIJ125X280-30
| 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 SAIJ125X280-30 Is Used
Product Changeover
Dial in the 250-280mm travel window during production line changeovers to accommodate different package sizes without physically replacing the cylinder.
Machine Setup
Use the rear stopper to fine-tune the exact retract end position during initial commissioning, ensuring precise mechanical alignment.
Heavy Forming
Leverage the 125mm bore's 8590N push force at 0.7MPa for heavy pressing or holding tasks, relying on the dual air cushions for smooth deceleration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30 the Right Cylinder?
Select this 125mm bore when an application requires high force, specifically 8590N at 0.7MPa, which is a significant step up from the 80mm bore's 3518N. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, whereas a fixed-stroke SAI cylinder is better suited for static, repeatable cycles. For load-holding without continuous air pressure, this cylinder is insufficient; you should consider the SAIL (air-released lock) or BSAI (clamp-lock) variants instead.
When replacing an ISO 15552 cylinder, match the 125mm bore, 280mm stroke, 30mm adjustment range, PT tapered port threads, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set. Because the 280mm stroke is substantial, the M27x2 carbon steel rod will still experience side-loading on long extensions; an external guide is recommended to prevent premature wear.
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 SAIJ125X280-30 FAQ
The SAIJ125X280-30 uses an external adjusting screw at the rear to mechanically shorten the retract stroke. It provides a usable travel window of 250-280mm, allowing you to trim up to 30mm off the 280mm nominal stroke. The adjuster acts as a travel stop and does not lock the load without live air pressure.
At 0.7MPa operating pressure, this 125mm bore cylinder generates 8590N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
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