Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30S 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 SAIJ125X280-30S
The AirTAC SAIJ125X280-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 250 to 280 mm. Delivering 6136 N of push force at 0.5 MPa, this extruded aluminum actuator handles heavy-duty positioning. The integrated -S magnet enables precise tracking with AirTAC CMSE reed and DMSE electronic sensors mounted in the dual side grooves.
This model utilizes a PT tapered port thread and a robust 32 mm carbon steel rod. The rear stopper mechanism allows mechanics to fine-tune the retract end position during commissioning without adding external stops. Remember that this adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30S |
|---|---|
| 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 SAIJ125X280-30S
| 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 SAIJ125X280-30S Is Used
Product Size Changeovers
Quickly adapt machinery for varying product lengths by dialing the retract position back up to 30 mm, eliminating the need to physically swap cylinders during line transitions.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy tooling heads, using the adjustable stop to perfectly set the final pressing depth at commissioning.
Variable End-Stop Assembly
Achieve precise end-of-stroke tuning on automated assembly lines without fabricating custom external mechanical stop blocks for each new fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-30S the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust, stepping up from a 100 mm bore that yields 3927 N at 0.5 MPa. The 30 mm adjustment window is ideal for product changeovers, letting you dial in the exact end position on the fly instead of swapping out a fixed-stroke SAI cylinder. To match this ISO 15552 footprint, specify the 280 mm stroke, 30 mm adjustment, PT port, and the -S magnet.
Because the 280 mm stroke is substantial, the 32 mm carbon steel rod will still require an external guide to prevent excessive side-loading. If your setup demands true load-holding without continuous air pressure, a plain SAIJ is insufficient; consider an AirTAC SAIL locking cylinder or a BSAI clamp-lock 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 SAIJ125X280-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from the 280 mm nominal stroke down to 250 mm. It sets the end position but does not lock the load without live air pressure.
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