Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40S
The AirTAC SAIJ125X750-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its built-in magnet supports position sensing via CMSE reed and DMSE electronic switches. A carbon steel rod with an M27x2 thread provides a robust interface for heavy-duty automation. The extruded aluminum barrel design integrates sensor grooves on both sides, ensuring flexible switch mounting without compromising the ISO 15552 dimensional interchangeability.
With a nominal 750mm stroke and a 40mm adjustment range, this model yields a usable travel window of 710-750mm. This allows precise end-position tuning at commissioning or during product changeovers without swapping the cylinder or adding external stops. The rear adjuster acts as a travel stop to set deceleration, not a lock, meaning it cannot hold a load without live air pressure. For applications requiring 30-500mm/s speeds, the variable air cushions at both ends absorb kinetic energy effectively.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 750 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 SAIJ125X750-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×750 | 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 SAIJ125X750-40S Is Used
Variable End-Stop Forming
Dial in the 710-750mm travel window on the fly for heavy-duty metal forming lines that process multiple part lengths without changing tooling.
Product Changeover Diverters
Fine-tune the retract position during packaging line format changes, using the rear stopper to set exact product diverting distances.
Heavy Machinery Setup
Achieve precise end-position calibration during large equipment commissioning, leveraging the 6136N force and 40mm adjustment range.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40S the Right Cylinder?
Choose this 125mm bore if your application requires approximately 6136N of thrust at 0.5 MPa, bridging the gap between the 80mm bore (2513N) and the 160mm bore (10053N). The adjustable 40mm stroke window is ideal for machinery requiring variable end-stops during product changeovers, whereas a fixed SAI cylinder lacks this commissioning flexibility. Because the nominal stroke is 750mm, an external guide is highly recommended to prevent excessive side-loading on the rod. The PT tapered port threads match standard pneumatic fittings, and the -S magnet enables precise position feedback.
If your machine needs to hold a position or load without continuous air pressure, note that the SAIJ rear adjuster is strictly a travel stop, not a locking device. For true load-holding, consider the SAIL air-released lock or BSAI clamp-lock cylinders. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets found on other ISO 15552 variants.
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 SAIJ125X750-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 750mm down to 710mm, creating a 710-750mm usable window. It functions as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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