Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50
The AirTAC SAIJ125X125-50 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stopper, allowing you to dial back the nominal 125 mm stroke by up to 50 mm. This yields a precise 75-125 mm usable travel window, enabling exact end-position calibration during commissioning without swapping out the unit. Built with a carbon steel piston rod, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa.
The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. It is important to note that the rear adjuster acts purely as a travel stop and does not function as a load lock; for pneumatic load-holding without live air pressure, consider the SAIL or BSAI series. Fluid ports are PT tapered G1/2 threads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-50 Is Used
Machine Setup Calibration
Dial in the exact retract end-position within the 75-125 mm window during initial commissioning to avoid machining errors.
Product Size Changeover
Quickly shorten the effective stroke by up to 50 mm on packaging lines when switching to a smaller product format.
Variable End-Stop Forming
Use the external stopper to set precise metal-forming depths without needing to physically replace the cylinder body.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50 the Right Cylinder?
Choose this 125 mm bore adjustable-stroke cylinder when your application requires heavy thrust (up to 8590 N push at 0.7 MPa) but demands variable end-stops for product changeovers. If you need less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, whereas a 160 mm bore provides 10053 N for heavier loads. The SAIJ is preferred over a fixed SAI cylinder when you need on-the-fly fine-tuning of the retract position.
Because the nominal stroke is 125 mm, an external guide is recommended to manage side loads. This model uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets. It is dimensionally interchangeable per ISO 15552, uses a PT port thread, and operates without a magnet.
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 SAIJ125X125-50 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjusting screw acts as a mechanical stopper that lets you trim the effective travel back from the 125 mm nominal stroke by up to 50 mm, creating a 75-125 mm adjustable travel window. This adjuster sets the end position but does not lock the load without live air pressure.
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