Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50
The AirTAC SAIJ125X550-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust linear motion for heavy-duty automation. It features a 125 mm bore, yielding 6136 N of push force at 0.5 MPa, and a 550 mm nominal stroke that can be dialed back by up to 50 mm. This creates a precise 500-550 mm usable travel window, allowing operators to fine-tune end positions during commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though this specific SKU omits the -S magnet option.
Built for demanding environments, this unit utilizes a SUS420J2 stainless steel rod (material code A) paired with an M27x2 rod thread, offering excellent resistance to corrosion and high side-load capacity. The adjuster functions strictly as a travel stop to set the retract end position and deceleration point alongside the variable air cushion; it does not hold the load without live air pressure. For applications requiring position holding without continuous pressure, an external rod lock or related series like SAIL or BSAI should be considered.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125AX550-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125AX550-50 Is Used
Heavy-Duty Press Tuning
Dial in the exact 500-550 mm retract position during press setup to accommodate different material thicknesses without mechanical rebuilds.
Product Changeover Stops
Adjust the end-stop on the fly for varying package sizes on a packaging line, using the 50 mm trim range to hit precise indexing marks.
Large Fixture Positioning
Position heavy automotive or steel fixtures with 6136 N of force, relying on the rear stopper to set the final resting coordinate accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-50 the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when your application requires 6136 N of push thrust at 0.5 MPa, stepping up significantly from the 80 mm bore which provides 2513 N. The adjustable stroke is particularly valuable in machine setups requiring variable end-stops or product-size changeovers, offering a 500-550 mm travel window. Because the nominal stroke is 550 mm, which exceeds 300 mm, it is critical to provide an external guide to support the rod and prevent excessive side-loading on the long unsupported travel.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 550 mm stroke, 50 mm adjustment range, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2—omitting FB, CA, CB, CR). Note that this specific configuration includes a SUS420J2 stainless steel rod but does not include a magnet (-S), meaning electronic or reed sensors will not function on this unit without modification.
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 SAIJ125AX550-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjusting screw acts as a mechanical stopper that allows you to shorten the effective stroke by up to 50 mm, creating a usable travel window of 500 to 550 mm. It only sets the end position and deceleration; it does not lock or hold the load without live air pressure.
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