Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50
The AirTAC SAIJ125X400-50 is a double-acting ISO 15552 profile cylinder engineered with a rear stroke adjuster. It provides a 350-400 mm usable travel window, letting you trim the 400 mm nominal stroke by up to 50 mm during commissioning. Delivering 6136 N of pull force at 0.5 MPa, it is built to handle heavy loads with a 32 mm SUS420J2 stainless steel rod.
This model features PT tapered port threads (G1/2) and variable air cushions at both ends. The external rear screw acts purely as a travel stop for end-position tuning, meaning it does not hold the load without live air pressure. For applications requiring position holding without continuous air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125AX400-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125AX400-50 Is Used
Machine Changeover
Fine-tune the 350-400 mm travel end-stop during product size transitions without physically swapping out the actuator.
Heavy Assembly Press
Leverage the 6136 N pull force at 0.5 MPa to seat heavy components, using the rear adjuster to dial in the exact contact position.
End-Position Tuning
Trim the retract stroke by up to 50 mm during commissioning to perfect machine timing and avoid mechanical hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50 the Right Cylinder?
Select this 125 mm bore cylinder when your application requires substantial force—stepping down to an 80 mm bore drops the 0.5 MPa pull force to 2268 N, while stepping up to a 160 mm bore yields 9425 N. The adjustable stroke is ideal for product changeovers, allowing you to fine-tune the retract position without swapping the cylinder or adding external stops.
When matching an ISO 15552 replacement, verify the 400 mm stroke, 50 mm adjustment range, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is 400 mm, ensure an external guide is used to prevent side-load wear on the rod.
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 SAIJ125AX400-50 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N at 0.7 MPa. It reaches a maximum of 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 400 mm nominal stroke by up to 50 mm, creating a 350-400 mm usable travel window. It sets the end position but does not lock the load without live air.
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