Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-75
The AirTAC SAIJ125X180-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 6136N push force at 0.5 MPa and uses a PT tapered port with a 32mm rod. The integrated rear stopper screw allows you to trim the effective travel back by up to 75mm, creating a usable 105-180mm positioning window without changing the physical barrel.
This unit features a SUS420J2 stainless steel rod for enhanced durability against moisture. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE or DMSE electronic switches if a magnet is added later. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAIJ125AX180-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SAIJ125AX180-75 Is Used
Variable End-Stop Positioning
Perfect for multi-product lines where the retract end-position shifts by up to 75mm between runs, allowing operators to reconfigure the stroke window quickly.
Commissioning Fine-Tuning
Eliminates the need for external stopper blocks during machine setup, letting engineers dial in the exact 105-180mm travel distance directly at the cylinder.
Heavy Assembly Pressing
Delivers 6136N of thrust at 0.5 MPa for pressing components, with the rear screw providing a hard mechanical stop to prevent over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-75 the Right Cylinder?
Choose this 125mm bore when your application requires the 6136N thrust at 0.5 MPa, stepping up from the 80mm bore which provides 2513N. The 75mm adjustment range is exceptionally large, making it ideal for product changeovers where the end-stop position varies significantly between runs. Unlike a fixed SAI cylinder, this rear screw lets you dial in the exact end position at commissioning without adding external stops.
Because the nominal stroke is 180mm, side-loading is minimal, but always guide the load externally for strict lateral stability. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ cannot hold a load without live air. For true pneumatic locking, select the SAIL or BSAI series. To match this ISO 15552 replacement, specify the 125mm bore, 180mm stroke, 75mm adjust, PT port, and your required mounting.
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 SAIJ125AX180-75 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates a push force of 6136N and a pull force of 5734N. At 0.9 MPa, the push force increases to 11045N.
The nominal stroke is 180mm, but the rear adjuster screw can be extended inward to shorten the stroke by up to 75mm. This creates an adjustable travel window of 105-180mm, allowing you to set the exact end position without swapping the cylinder.
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