Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20
The AirTAC SAIJ125X55-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. It features a 32mm SUS420J2 stainless steel rod and PT tapered ports. By turning the rear screw, you can trim the 55mm nominal stroke back by up to 20mm, creating a precise 35-55mm usable travel window for fine-tuning end positions during commissioning.
This adjustable stopper lets you dial in the exact retract distance without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the standard variable air cushioning at both ends handles deceleration. Note that the adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125AX55-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125AX55-20 Is Used
Machine Setup & Changeover
Fine-tune the 35-55mm travel window during product line changeovers to set exact end positions without machining new external hard stops.
Variable End-Stop Positioning
Dial in the retract distance on heavy machinery using the rear adjuster, accommodating different workpiece sizes on the fly.
Heavy-Duty Clamping
Leverage the 6136N push force at 0.5MPa to securely clamp large components while adjusting the clamping depth precisely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20 the Right Cylinder?
Choose this 125mm bore when you need heavy thrust (6136N push at 0.5MPa) with a short, highly adjustable retract distance. If your application requires less force, stepping down to an 80mm bore yields 2513N push force, whereas a 160mm bore provides 10053N for larger loads. The adjustable 35-55mm window is ideal for product-size changeovers on a line, allowing you to reposition the end stop quickly rather than machining new hard stops.
When replacing an ISO 15552 cylinder, match the 125mm bore, 55mm stroke, 20mm adjustment range, PT port thread, and mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Because the rod thread is M27x2, ensure your mechanical coupling handles this heavy-duty interface. For load-holding without continuous air pressure, consider an external rod lock or the AirTAC SAIL/BSAI series, as this cylinder relies entirely on live air to maintain position.
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 SAIJ125AX55-20 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjusting screw acts as a mechanical stop that allows you to shorten the 55mm nominal stroke by up to 20mm. This provides a usable travel window of 35-55mm, enabling precise end-position tuning at commissioning without replacing the cylinder.
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