Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 30mm 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
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20
The AirTAC SAIJ125X30-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. By turning the external rear stopper screw, you can trim the 30 mm nominal stroke back by up to 20 mm. This yields a highly precise 10-30 mm usable travel window, ideal for dialing in final end positions during machine commissioning without adding external stops.
Built with a SUS420J2 stainless steel rod (material code A) and a PT tapered port thread, this 125 mm bore unit runs at 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides for tracking position. It uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets found on other variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAIJ125AX30-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SAIJ125AX30-20 Is Used
Short-Stroke End-Stop Tuning
Dial in the exact 10-30 mm travel window during machine commissioning to perfect clamping or pressing positions without swapping hardware.
Product Size Changeover
Quickly adjust the stroke length on packaging lines when product dimensions change, using the rear screw to set a new retracted end-stop.
High-Force Positioning
Leverage the 6136N thrust at 0.5 MPa to move heavy pallets or lift assemblies precisely over a very short, adjustable travel distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX30-20 the Right Cylinder?
Select this 125 mm bore model when your application requires high force (6136N push at 0.5 MPa) over a very short distance that must be finely tuned on-site. If you need less thrust, stepping down to an 80 mm bore yields 2513N push at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053N. Choose this adjustable-stroke SAIJ over a fixed-stroke SAI when you need to accommodate product-size changeovers or variable end-stops on the fly. To match an ISO 15552 replacement exactly, verify the 125 mm bore, 30 mm stroke, 20 mm adjustment, PT port, and required mounting bracket.
Because the nominal stroke is only 30 mm, the side-load risk is minimal, but the load must still be guided externally. Remember that the rear adjuster acts only as a travel stop to set deceleration; it does not hold the load without live air. For true position holding without pneumatic pressure, consider an AirTAC SAIL or BSAI 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 SAIJ125AX30-20 FAQ
At 0.5 MPa operating pressure, this 125 mm 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 lets you shorten the 30 mm nominal stroke by up to 20 mm, creating a 10-30 mm usable travel window. This stopper sets the travel end and deceleration, but it is not a lock and will not hold the load without live air pressure.
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