Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20 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 SAIJ125AX750-20
The AirTAC SAIJ125X750-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 730-750 mm usable travel window, allowing you to trim the effective stroke by up to 20 mm during commissioning. Built with an extruded aluminum barrel, it delivers 8590 N of push force at 0.7 MPa.
This model uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and features PT tapered port threads. The rear adjuster acts strictly as a mechanical stop to fine-tune the end position without needing external stops. It does not hold the load without live air pressure; for load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20 |
|---|---|
| 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 SAIJ125AX750-20
| 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 SAIJ125AX750-20 Is Used
Machine Setup Changeover
Fine-tune the 730-750 mm end position during product size changes without physically replacing the cylinder or adding external mechanical stops.
Variable End-Stop Positioning
Dial in the exact retract distance on heavy machinery, using the 20 mm rear adjustment screw to compensate for mechanical tolerances during commissioning.
Long-Stroke Guiding
Leverage the 8590 N push force for large actuation tasks while relying on the 32 mm rod and external guides to handle the 750 mm travel safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20 the Right Cylinder?
Choose this 125 mm bore cylinder when substantial thrust is required, delivering 8590 N at 0.7 MPa. If your application needs less force, stepping down to a 100 mm bore provides 5497 N at the same pressure. The adjustable stroke is perfect for product changeovers on a line, letting you dial in the 730-750 mm travel window without swapping the cylinder for a fixed-stroke SAI model.
Because this features a 750 mm stroke, the 32 mm rod diameter requires external guiding to prevent excessive side-loading on the seals. This SKU omits the FB, CA, CB, and CR mounts, utilizing a reduced ISO 15552 mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Operating speed is 30-500 mm/s.
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 SAIJ125AX750-20 FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 750 mm nominal stroke by up to 20 mm, providing a usable travel window of 730-750 mm. It only sets the end position and does not lock the load without live air.
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