Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30 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 SAIJ125AX400-30
The AirTAC SAIJ125X400-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 400 mm stroke that can be fine-tuned backward by up to 30 mm, creating a precise 370-400 mm usable travel window. Equipped with a SUS420J2 stainless steel rod and PT tapered ports, it generates 6136 N of push thrust at 0.5 MPa.
This adjustable-stroke design allows you to dial in exact end positions during commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches, though a magnet is required for that functionality. The rear adjuster acts purely as a travel stop, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30 |
|---|---|
| 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 SAIJ125AX400-30
| 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 SAIJ125AX400-30 Is Used
Press Positioning
Fine-tune the 370-400 mm travel window during machine commissioning to achieve precise pressing depths without mechanical shims.
Product Changeover
Quickly adjust the end-stop for different package sizes on a packaging line, utilizing the 30 mm adjustment range to adapt the stroke on the fly.
Assembly Station Setup
Dial in the exact retraction point during initial assembly line setup, leveraging the 6136 N thrust to handle heavy fixtures accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30 the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N at 0.5 MPa) would be excessive. The adjustable 370-400 mm travel window is ideal for product changeovers or fine-tuning end positions on the fly, offering more setup flexibility than a fixed-stroke SAI cylinder. Because the 400 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the 32 mm rod.
For load-holding applications without continuous live air, this cylinder is not suitable as the rear adjuster is only a stop, not a lock; consider an AirTAC SAIL or BSAI cylinder instead. It uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR mounts. It is dimensionally interchangeable per ISO 15552.
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 SAIJ125AX400-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push thrust and 5734 N of pull thrust. It can reach a maximum push force of 11045 N at 0.9 MPa.
A rear screw stopper mechanically limits the piston's travel, allowing you to shorten the effective stroke from 400 mm down to 370 mm. This adjuster is a hard stop for end-position tuning and does not lock or hold the load without live air pressure.
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