Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20S 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 SAIJ125AX180-20S
The AirTAC SAIJ125X180-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 160 to 180 mm. Built with an extruded aluminum barrel, it delivers 8590 N of push force at 0.7 MPa. This version features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet for position sensing.
The integrated -20 mm adjustment screw allows you to fine-tune the retract end position during commissioning without adding external stops. It supports PT tapered ports and operates at speeds between 30 and 500 mm/s. The rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20S |
|---|---|
| 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 SAIJ125AX180-20S
| 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 SAIJ125AX180-20S Is Used
Product Changeovers
Dial in the exact 160-180 mm end stop during format size changes on packaging lines without swapping out the entire actuator.
Machine Setup
Fine-tune the retract position at commissioning to achieve precise mechanical alignment, avoiding the need for external shims.
Variable End Stops
Adjust the stroke window on heavy-duty material handling stations to accommodate varying workpiece lengths on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 5497 N push at 0.7 MPa) lacks the necessary thrust, but a 160 mm bore is physically too large. The adjustable 160-180 mm stroke is ideal for machinery requiring frequent product-size changeovers, giving you exact end-position control that a fixed-stroke SAI cannot match. For load-holding without continuous air pressure, consider an external rod lock or the SAIL series.
As a dimensionally interchangeable ISO 15552 cylinder, it mounts via Basic, FA, LB, TC, FTC, TCM1, or TCM2 brackets (omitting FB/CA/CB/CR). The -S magnet works seamlessly with AirTAC CMSE reed and DMSE electronic sensors. With an 180 mm stroke, the 32 mm rod handles high thrust well, though any long unsupported stroke still requires an external guide to prevent side-loading damage.
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 SAIJ125AX180-20S 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 0.5 MPa, the push force is 6136 N.
The rear adjuster screw allows you to trim the effective stroke back by up to 20 mm, creating a 160 to 180 mm usable travel window. It acts as a mechanical stop and does not lock the load without live air.
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Standard models usually ship in 3-4 days.
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