Airtac SAIJ125 Adjustable Cylinder SAIJ125AX260-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX260-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 260mm 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
- Stroke260 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX260-40
The AirTAC SAIJ125X260-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 220 to 260 mm, allowing you to trim up to 40 mm off the nominal stroke during commissioning. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force. The piston rod is constructed from SUS420J2 stainless steel, offering enhanced corrosion resistance compared to standard carbon steel.
This model uses PT tapered port threads (G1/2) and includes variable air cushions at both ends to manage impact. The rear adjuster acts purely as a mechanical stop to set the end position and does not hold the load without live air pressure. For position holding, external rod locks or related series like SAIL are required. The extruded aluminum barrel features sensor grooves on both sides, though this specific SKU omits the magnet for electronic sensing.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX260-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX260-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 260 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 SAIJ125AX260-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×260 | 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 SAIJ125AX260-40 Is Used
Product Changeover
Dial in the end stop up to 40 mm to accommodate varying package sizes on a packaging line without changing out the physical cylinder.
Machine Setup
Fine-tune the retracted end position during initial commissioning to perfectly align tooling, preventing the need for custom machined spacers.
Variable End Stops
Provide a flexible 220 to 260 mm travel window on heavy machinery where the exact final position must be adjusted on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX260-40 the Right Cylinder?
Select this 125 mm bore when an application requires over 5700 N of pull force at 0.5 MPa, bridging the gap below the 160 mm bore which offers 9425 N. The 40 mm adjustment range is ideal for product changeovers on a line, letting operators dial in the exact end position without swapping cylinders or adding external stops. Because the total stroke is 260 mm, ensure the unsupported rod length is adequately guided to prevent excessive side loading on the bearings.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 260 mm nominal stroke, 40 mm adjuster, PT G1/2 port, and SUS420J2 rod material. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. If pneumatic position holding is required without live pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster is not a lock.
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 SAIJ125AX260-40 FAQ
At 0.5 MPa operating pressure, the SAIJ125X260-40 provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 40 mm, creating a 220 to 260 mm travel window. It sets the end position but does not lock the load without continuous air pressure.
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