Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40 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 SAIJ125X450-40
The AirTAC SAIJ125X450-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, utilizing a 32mm carbon steel rod with an M27x2 thread. By turning the rear screw, you can trim the effective travel by up to 40mm, creating a precise 410-450mm usable window for fine-tuning end positions during commissioning.
This extruded aluminum barrel design includes sensor grooves on both sides for flexible switch mounting. It supports operating speeds of 30-500mm/s and uses PT tapered port threads (G1/2). The rear adjuster acts strictly as a mechanical stop to set the deceleration point, meaning it cannot hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40 |
|---|---|
| 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 SAIJ125X450-40
| 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 SAIJ125X450-40 Is Used
Product Changeovers
Dial in the 410-450mm travel window during format changes on a packaging line, avoiding the need to physically swap cylinders for different carton sizes.
End-Position Tuning
Fine-tune the retracted end-stop during machine commissioning to perfect tooling alignment without adding bulky external stopper blocks.
Heavy Forming Press
Leverage the 6136N push force at 0.5 MPa for heavy-duty pressing operations where the exact bottoming depth needs micro-adjustments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40 the Right Cylinder?
Selecting this 125mm bore over a smaller 100mm option provides a significant force jump, stepping up from 3927N to 6136N at 0.5 MPa. You would choose the SAIJ adjustable-stroke format over a fixed SAI cylinder when a machine requires variable end-stops or product-size changeovers without physically swapping the actuator. To match this exact ISO 15552 replacement, verify the 450mm stroke, 40mm adjustment range, PT port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because the 450mm stroke is substantial, the unsupported mass of the 32mm rod requires an external guide to prevent excessive side-loading and premature seal wear. For applications that must hold position safely without live air, note that this cylinder lacks a locking mechanism; you should instead specify an AirTAC 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 SAIJ125X450-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 8590N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 450mm stroke by up to 40mm, providing an effective travel range of 410-450mm. It sets the end position but does not lock the load without continuous air pressure.
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