Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50
The AirTAC SAIJ125X70-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. With a nominal 70mm stroke and a 50mm adjustment range, it provides a usable travel window of 20-70mm. This allows precise end-position tuning at commissioning without swapping the cylinder or adding external stops.
It features a carbon steel piston rod with an M27x2 thread and a G1/2 PT port. The extruded aluminum barrel includes sensor grooves on both sides for CMSE or DMSE switches. The rear adjuster acts strictly as a travel stop for deceleration, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125X70-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125X70-50 Is Used
Variable End Stops
Dial in the exact clamping position between 20mm and 70mm during machine setup, accommodating different material thicknesses without hardware changes.
Product Changeover
Quickly reconfigure the stroke window on packaging lines when switching to a new product size, minimizing downtime.
Heavy-Duty Positioning
Leverage the 6136N push force to move heavy pallets or fixtures, using the rear stopper to fine-tune the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50 the Right Cylinder?
Choose this 125mm bore when an 80mm bore (2513N push at 0.5MPa) lacks the thrust for your setup, but a 160mm bore (10053N) is excessive. The 50mm adjustment range is ideal for product-size changeovers on a line, letting you dial back the stroke from 70mm down to 20mm. For exact ISO 15552 replacement matching, verify the 70mm stroke, 50mm adjuster, G1/2 port, and mounting style.
Although the stroke is short, the heavy thrust means external guides are recommended to manage side loads. If you need to hold a load without live air pressure, the SAIJ adjuster will not act as a brake; consider an external rod lock or pilot-operated check valve. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X70-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from the nominal 70mm down to 20mm. This creates a 20-70mm adjustable window for fine-tuning the retract end position without locking the load.
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