Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30S 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 SAIJ125AX400-30S
The AirTAC SAIJ125X400-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 370 to 400 mm. It delivers 6136 N of push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks. The integrated -S magnet enables position sensing via CMSE reed or DMSE electronic switches.
This model features a SUS420J2 stainless steel rod for enhanced corrosion resistance and utilizes PT tapered port threads. The rear stopper mechanism allows precise end-position tuning at commissioning without swapping out the entire cylinder. Note that the adjuster acts strictly as a travel stop, not a load lock, so live air is required to maintain position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30S |
|---|---|
| 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 SAIJ125AX400-30S
| 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 SAIJ125AX400-30S Is Used
Variable End-Stop Tuning
Fine-tune the retract position within a 370-400 mm window during machine commissioning to achieve precise product alignment without hardware changes.
Product Size Changeover
Quickly adjust the stroke by up to 30 mm when switching between different product sizes on a high-thrust assembly line.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy fixtures accurately, using the SUS420J2 rod for durability in demanding environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-30S the Right Cylinder?
Choose this 125 mm bore when a smaller 100 mm cylinder lacks thrust, as the 100 mm bore provides only 3927 N of push force at 0.5 MPa compared to the 6136 N offered here. The adjustable 30 mm window is ideal for product changeovers on a line, allowing you to dial in the exact retract distance without adding external stops. If your process requires holding a load without continuous air pressure, consider the SAIL or BSAI variants instead of relying on the SAIJ adjuster.
Because the 400 mm stroke is substantial, the 32 mm rod diameter and M27x2 rod thread provide robust support, but an external guide is strongly recommended to prevent excessive side-loading on the piston. For a drop-in ISO 15552 replacement, match the 125 mm bore, 400 mm stroke, 30 mm adjustment, PT ports, and -S magnet configuration.
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 SAIJ125AX400-30S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At the maximum operating pressure of 1.0 MPa, it delivers a maximum push force of 1251 kgf.
The rear adjuster allows you to shorten the effective stroke by up to 30 mm, creating a usable travel window of 370 to 400 mm. This stopper only sets the travel end and does not lock the load without live air pressure.
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