Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X180-20 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20
By turning the integrated stopper screw, you can dial back the 180mm nominal stroke by up to 20mm, creating a precise 160-180mm usable travel window. This on-machine fine-tuning eliminates the need to swap cylinders or bolt on external stops during product changeovers.
Built with a carbon steel piston rod and an M27x2 rod thread, this large-bore unit handles substantial side loads while operating at speeds of 30-500mm/s. The extruded aluminum barrel features sensor grooves on both sides for CMSE reed and DMSE electronic switches. It supports a specific mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR foot and pivot options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20 |
|---|---|
| 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20
| 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 SAIJ125X180-20 Is Used
Product Size Changeovers
Dial in the exact end-stop position for different part lengths on a single machine bed without physically swapping out the entire actuator.
Machine Commissioning
Fine-tune the 160-180mm travel window during initial setup to perfectly time the stroke endpoint without adding external mechanical spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-20 the Right Cylinder?
The adjustable 160-180mm travel window is ideal for commissioning setups where the exact end-of-stroke position varies slightly, providing a variable end-stop rather than forcing you to machine custom spacer blocks. Unlike a fixed-stroke SAI cylinder, this SAIJ model allows you to trim the retract position on the fly.
For replacements, match the 125mm bore, 180mm stroke, 20mm adjustment, PT tapered port thread, and the required mounting accessory. Note that the rear adjuster acts only as a travel stop and the air cushions provide deceleration; neither will hold a load without live air pressure. For true load-holding, select an SAIL air-released lock or BSAI clamp-lock cylinder instead.
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 SAIJ125X180-20 FAQ
At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of thrust.
The rear adjuster screw lets you shorten the 180mm nominal stroke by up to 20mm, resulting in a usable travel window of 160-180mm. This allows you to set the exact retract end-position during commissioning without replacing the cylinder.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Related AirTAC SAI Cylinders
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