Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40
The AirTAC SAIJ125X450-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 410 to 450 mm usable travel window, allowing you to trim the nominal 450 mm stroke by up to 40 mm during commissioning without adding external stops. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force.
This unit incorporates a SUS420J2 stainless steel rod for superior corrosion resistance and accepts PT tapered port threads. It utilizes variable air cushions at both ends to manage deceleration across its 30-500 mm/s speed range. The extruded aluminum barrel includes dual sensor grooves, allowing you to mount position feedback hardware if needed.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125AX450-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125AX450-40 Is Used
Machine Changeover
Fine-tune the 410 to 450 mm retract position during product size changes without physically replacing the cylinder or adding external stopper blocks.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or chassis components, dialing in the exact end-stop for varied load depths.
Pressing and Forming
Adjust the travel end-point precisely for different material thicknesses or pressing depths, using the 40 mm adjustment window to set the final position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder lacks thrust (providing only 2513 N push at 0.5 MPa) and a 160 mm bore is excessive. The adjustable stroke is ideal for product changeovers, letting you fine-tune the retract end position on the fly rather than swapping a fixed-stroke SAI cylinder. To match this ISO 15552 replacement exactly, specify the 125 mm bore, 450 mm stroke, 40 mm adjustment, PT ports, and the SUS420J2 (A) rod material.
Because the 450 mm stroke is long, an external guide is recommended to prevent excessive side-loading on the rod. Note that the rear adjuster and air cushions act only as travel stops and deceleration devices; they do 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 SAIJ125AX450-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 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 stopper that lets you shorten the effective stroke from 450 mm down to 410 mm. This allows precise end-position tuning at commissioning without swapping the cylinder, though it does not lock the load without continuous air pressure.
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