Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30
The AirTAC SAIJ125X270-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of pull force at 0.5 MPa. It features a 32mm carbon steel rod with an M27x2 thread and PT tapered porting. The integrated rear stopper allows you to trim the nominal 270mm travel back by up to 30mm, creating a precise 240-270mm usable window for exact end-position tuning.
This adjustable design eliminates the need to swap cylinders or bolt on external stops during product changeovers. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches, though this specific SKU ships without a magnet. The rear adjuster acts strictly as a travel stop to set deceleration, not a lock, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125X270-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125X270-30 Is Used
Variable End-Stop Positioning
Dial in the exact clamping depth on large fixtures by adjusting the 240-270mm travel window during setup, avoiding the need to machine custom spacer blocks.
Product Size Changeover
Quickly adapt a packaging or handling line to new part dimensions by turning the rear adjuster, trimming the stroke up to 30mm to accommodate varying package sizes.
Heavy-Duty Pressing
Leverage the 6136N pull force at 0.5 MPa for pressing or forming operations while fine-tuning the bottom dead center position without altering the pneumatic plumbing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30 the Right Cylinder?
Choose this 125mm bore when your application requires substantial thrust—stepping down to an 80mm bore drops the 0.5MPa pull force to 2268N, while moving up to 160mm yields 9425N. The SAIJ125X270-30 is selected over a fixed-stroke SAI when commissioning flexibility is paramount, allowing you to dial in the 240-270mm travel window on the machine without mechanical rework. For a true ISO 15552 replacement match, verify the 270mm stroke, 30mm adjustment, PT G1/2 port, and standard carbon steel rod.
Because the 270mm stroke is relatively long for this bore size, an external guide is recommended to manage side loads and prevent rod binding. If your process requires load-holding without continuous air pressure, this cylinder is insufficient; consider an AirTAC SAIL pneumatic lock or 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 SAIJ125X270-30 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the nominal 270mm down to 240mm. It sets the end position and decelereration point but does not lock or hold the load without live air pressure.
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